[Bug 1718568] Re: dhclient-script fails to wait for link-local address
This bug was fixed in the package isc-dhcp - 4.2.4-7ubuntu12.13 --- isc-dhcp (4.2.4-7ubuntu12.13) trusty; urgency=medium * dhclient-script.linux: handle empty case also when waiting for ipv6 link local DAD. (LP: #1718568) -- Dan Streetman Fri, 02 Mar 2018 13:17:36 -0500 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718568 Title: dhclient-script fails to wait for link-local address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
This bug was fixed in the package isc-dhcp - 4.3.3-5ubuntu12.10 --- isc-dhcp (4.3.3-5ubuntu12.10) xenial; urgency=medium * dhclient-script.linux: handle empty case also when waiting for ipv6 link local DAD. (LP: #1718568) -- Dan Streetman Fri, 02 Mar 2018 13:16:05 -0500 ** Changed in: isc-dhcp (Ubuntu Xenial) Status: Fix Committed => Fix Released ** Changed in: isc-dhcp (Ubuntu Trusty) Status: Fix Committed => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718568 Title: dhclient-script fails to wait for link-local address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
This bug was fixed in the package isc-dhcp - 4.3.5-3ubuntu2.3 --- isc-dhcp (4.3.5-3ubuntu2.3) artful; urgency=medium * dhclient-script.linux: handle empty case also when waiting for ipv6 link local DAD. (LP: #1718568) -- Dan Streetman Fri, 02 Mar 2018 13:14:51 -0500 ** Changed in: isc-dhcp (Ubuntu Artful) Status: Fix Committed => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718568 Title: dhclient-script fails to wait for link-local address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
The only failure shown now seems to be network-manager, which is failing its 'test_no_ap' test; that appears to have been failing for a while: http://autopkgtest.ubuntu.com/packages/n/network-manager/artful/amd64 also there's a bug opened today for it: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1755466 The test log in that bug description shows the same failure, test_no_ap, and the log shows the isc-dhcp installed package version is 4.3.5-3ubuntu2.2, which doesn't contain the change from this bug. The other autopkgtest it's failing is the 'killswitches-no-urfkill' test; it fails at this check: if ! LC_MESSAGES=C nmcli radio wifi | grep -qc disabled; then echo "ERROR: NM could not track device state." This is failing because the test case is faulty; it's being tracked in this bug: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1733321 So I think we can ignore both these autopkgtest failures. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718568 Title: dhclient-script fails to wait for link-local address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
Hey Dan! I see some autopkgtests failing for this upload for artful, I re-ran them to see how frequently those are reproducible. The systemd one is flaky, but I would like someone to take a look at the network- manager ones. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718568 Title: dhclient-script fails to wait for link-local address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
trusty: host~$ virsh domif-setlink lp1718568-trusty vnet4 down Device updated successfully ubuntu@lp1718568-trusty:~$ dpkg -l | grep isc-dhcp ii isc-dhcp-client 4.2.4-7ubuntu12.12 amd64ISC DHCP client ii isc-dhcp-common 4.2.4-7ubuntu12.12 amd64common files used by all the isc-dhcp* packages ubuntu@lp1718568-trusty:~$ sudo ip l set down dev eth1 ubuntu@lp1718568-trusty:~$ sudo ip l show eth1 3: eth1: mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000 link/ether 52:54:00:1f:1a:c6 brd ff:ff:ff:ff:ff:ff ubuntu@lp1718568-trusty:~$ sudo dhclient -v -6 eth1 Internet Systems Consortium DHCP Client 4.2.4 Copyright 2004-2012 Internet Systems Consortium. All rights reserved. For info, please visit https://www.isc.org/software/dhcp/ no link-local IPv6 address for eth1 with -updates pkg: ubuntu@lp1718568-trusty:~$ dpkg -l | grep isc-dhcp ii isc-dhcp-client 4.2.4-7ubuntu12.13 amd64ISC DHCP client ii isc-dhcp-common 4.2.4-7ubuntu12.13 amd64common files used by all the isc-dhcp* packages ubuntu@lp1718568-trusty:~$ sudo ip l set down dev eth1 ubuntu@lp1718568-trusty:~$ sudo ip l show eth1 3: eth1: mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT group default qlen 1000 link/ether 52:54:00:1f:1a:c6 brd ff:ff:ff:ff:ff:ff ubuntu@lp1718568-trusty:~$ sudo dhclient -v -6 eth1 Internet Systems Consortium DHCP Client 4.2.4 Copyright 2004-2012 Internet Systems Consortium. All rights reserved. For info, please visit https://www.isc.org/software/dhcp/ (blocks) host$ virsh domif-setlink lp1718568-trusty vnet4 up Device updated successfully Listening on Socket/eth1 Sending on Socket/eth1 PRC: Soliciting for leases (INIT). XMT: Forming Solicit, 0 ms elapsed. XMT: X-- IA_NA 00:1f:1a:c6 XMT: | X-- Request renew in +3600 XMT: | X-- Request rebind in +5400 XMT: Solicit on eth1, interval 1010ms. RCV: Advertise message on eth1 from fe80::5054:ff:fec9:897c. RCV: X-- IA_NA 00:1f:1a:c6 RCV: | X-- starts 1520536242 RCV: | X-- t1 - renew +3600 RCV: | X-- t2 - rebind +7200 RCV: | X-- [Options] RCV: | | X-- IAADDR 2001:db8::93 RCV: | | | X-- Preferred lifetime 604800. RCV: | | | X-- Max lifetime 2592000. RCV: X-- Server ID: 00:01:00:01:22:2c:61:12:52:54:00:c9:89:7c RCV: Advertisement recorded. PRC: Selecting best advertised lease. PRC: Considering best lease. PRC: X-- Initial candidate 00:01:00:01:22:2c:61:12:52:54:00:c9:89:7c (s: 155, p: 0). XMT: Forming Request, 0 ms elapsed. XMT: X-- IA_NA 00:1f:1a:c6 XMT: | X-- Requested renew +3600 XMT: | X-- Requested rebind +5400 XMT: | | X-- IAADDR 2001:db8::93 XMT: | | | X-- Preferred lifetime +7200 XMT: | | | X-- Max lifetime +7500 XMT: V IA_NA appended. XMT: Request on eth1, interval 1040ms. RCV: Reply message on eth1 from fe80::5054:ff:fec9:897c. RCV: X-- IA_NA 00:1f:1a:c6 RCV: | X-- starts 1520536243 RCV: | X-- t1 - renew +3600 RCV: | X-- t2 - rebind +7200 RCV: | X-- [Options] RCV: | | X-- IAADDR 2001:db8::93 RCV: | | | X-- Preferred lifetime 604800. RCV: | | | X-- Max lifetime 2592000. RCV: X-- Server ID: 00:01:00:01:22:2c:61:12:52:54:00:c9:89:7c PRC: Bound to lease 00:01:00:01:22:2c:61:12:52:54:00:c9:89:7c. ** Tags removed: verification-needed verification-needed-artful verification-needed-trusty verification-needed-xenial ** Tags added: verification-done verification-done-artful verification-done-trusty verification-done-xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718568 Title: dhclient-script fails to wait for link-local address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
artful: ubuntu@lp1718568-artful:~$ dpkg -l | grep isc-dhcp ii isc-dhcp-client4.3.5-3ubuntu2.2 amd64DHCP client for automatically obtaining an IP address ii isc-dhcp-common4.3.5-3ubuntu2.2 amd64common manpages relevant to all of the isc-dhcp packages ubuntu@lp1718568-artful:~$ sudo ip l set down dev ens7 ubuntu@lp1718568-artful:~$ sudo ip l show ens7 3: ens7: mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT group default qlen 1000 link/ether 52:54:00:bf:16:8a brd ff:ff:ff:ff:ff:ff (on host): $ virsh domif-setlink lp1718568-artful vnet8 down Device updated successfully (back on guest): ubuntu@lp1718568-artful:~$ sudo dhclient -v -6 ens7 Internet Systems Consortium DHCP Client 4.3.5 Copyright 2004-2016 Internet Systems Consortium. All rights reserved. For info, please visit https://www.isc.org/software/dhcp/ no link-local IPv6 address for ens7 If you think you have received this message due to a bug rather than a configuration issue please read the section on submitting bugs on either our web page at www.isc.org or in the README file before submitting a bug. These pages explain the proper process and the information we find helpful for debugging.. exiting. after updating to -proposed: ubuntu@lp1718568-artful:~$ sudo ip l set down dev ens7 ubuntu@lp1718568-artful:~$ sudo ip l show ens7 3: ens7: mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT group default qlen 1000 link/ether 52:54:00:bf:16:8a brd ff:ff:ff:ff:ff:ff ubuntu@lp1718568-artful:~$ dpkg -l | grep isc-dhcp ii isc-dhcp-client4.3.5-3ubuntu2.3 amd64DHCP client for automatically obtaining an IP address ii isc-dhcp-common4.3.5-3ubuntu2.3 amd64common manpages relevant to all of the isc-dhcp packages ubuntu@lp1718568-artful:~$ sudo dhclient -v -6 ens7 Internet Systems Consortium DHCP Client 4.3.5 Copyright 2004-2016 Internet Systems Consortium. All rights reserved. For info, please visit https://www.isc.org/software/dhcp/ (blocks, waiting for ipv6 link-local addr) (on host): $ virsh domif-setlink lp1718568-artful vnet8 up Device updated successfully (back on guest): Listening on Socket/ens7 Sending on Socket/ens7 PRC: Soliciting for leases (INIT). XMT: Forming Solicit, 0 ms elapsed. XMT: X-- IA_NA 00:bf:16:8a XMT: | X-- Request renew in +3600 XMT: | X-- Request rebind in +5400 XMT: | X-- Request address 2001:db8::99. XMT: | | X-- Request preferred in +7200 XMT: | | X-- Request valid in +10800 XMT: Solicit on ens7, interval 1020ms. RCV: Advertise message on ens7 from fe80::5054:ff:fec9:897c. RCV: X-- IA_NA 00:bf:16:8a RCV: | X-- starts 1520535276 RCV: | X-- t1 - renew +3600 RCV: | X-- t2 - rebind +7200 RCV: | X-- [Options] RCV: | | X-- IAADDR 2001:db8::99 RCV: | | | X-- Preferred lifetime 604800. RCV: | | | X-- Max lifetime 2592000. RCV: X-- Server ID: 00:01:00:01:22:2c:61:12:52:54:00:c9:89:7c RCV: Advertisement recorded. PRC: Selecting best advertised lease. PRC: Considering best lease. PRC: X-- Initial candidate 00:01:00:01:22:2c:61:12:52:54:00:c9:89:7c (s: 10105, p: 0). XMT: Forming Request, 0 ms elapsed. XMT: X-- IA_NA 00:bf:16:8a XMT: | X-- Requested renew +3600 XMT: | X-- Requested rebind +5400 XMT: | | X-- IAADDR 2001:db8::99 XMT: | | | X-- Preferred lifetime +7200 XMT: | | | X-- Max lifetime +7500 XMT: V IA_NA appended. XMT: Request on ens7, interval 940ms. RCV: Reply message on ens7 from fe80::5054:ff:fec9:897c. RCV: X-- IA_NA 00:bf:16:8a RCV: | X-- starts 1520535277 RCV: | X-- t1 - renew +3600 RCV: | X-- t2 - rebind +7200 RCV: | X-- [Options] RCV: | | X-- IAADDR 2001:db8::99 RCV: | | | X-- Preferred lifetime 604800. RCV: | | | X-- Max lifetime 2592000. RCV: X-- Server ID: 00:01:00:01:22:2c:61:12:52:54:00:c9:89:7c PRC: Bound to lease 00:01:00:01:22:2c:61:12:52:54:00:c9:89:7c. -proposed package verified -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718568 Title: dhclient-script fails to wait for link-local address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
xenial: ubuntu@lp1718568-xenial:~$ dpkg -l | grep isc-dhcp ii isc-dhcp-client 4.3.3-5ubuntu12.9 amd64DHCP client for automatically obtaining an IP address ii isc-dhcp-common 4.3.3-5ubuntu12.9 amd64common files used by all of the isc-dhcp packages host$ virsh domif-setlink lp1718568-xenial vnet6 down Device updated successfully ubuntu@lp1718568-xenial:~$ sudo dhclient -v -6 ens7 Internet Systems Consortium DHCP Client 4.3.3 Copyright 2004-2015 Internet Systems Consortium. All rights reserved. For info, please visit https://www.isc.org/software/dhcp/ no link-local IPv6 address for ens7 If you think you have received this message due to a bug rather than a configuration issue please read the section on submitting bugs on either our web page at www.isc.org or in the README file before submitting a bug. These pages explain the proper process and the information we find helpful for debugging.. exiting. with -proposed pkg: ubuntu@lp1718568-xenial:~$ dpkg -l | grep isc-dhcp ii isc-dhcp-client 4.3.3-5ubuntu12.10 amd64DHCP client for automatically obtaining an IP address ii isc-dhcp-common 4.3.3-5ubuntu12.10 amd64common files used by all of the isc-dhcp packages ubuntu@lp1718568-xenial:~$ sudo ip l set down dev ens7 ubuntu@lp1718568-xenial:~$ sudo ip l show dev ens7 3: ens7: mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT group default qlen 1000 link/ether 52:54:00:f3:99:a8 brd ff:ff:ff:ff:ff:ff ubuntu@lp1718568-xenial:~$ sudo dhclient -v -6 ens7 Internet Systems Consortium DHCP Client 4.3.3 Copyright 2004-2015 Internet Systems Consortium. All rights reserved. For info, please visit https://www.isc.org/software/dhcp/ (blocks) $ virsh domif-setlink lp1718568-xenial vnet6 up Device updated successfully Listening on Socket/ens7 Sending on Socket/ens7 Created duid \000\001\000\001\"4D\337RT\000\363\231\250. PRC: Soliciting for leases (INIT). XMT: Forming Solicit, 0 ms elapsed. XMT: X-- IA_NA 00:f3:99:a8 XMT: | X-- Request renew in +3600 XMT: | X-- Request rebind in +5400 XMT: Solicit on ens7, interval 1040ms. RCV: Advertise message on ens7 from fe80::5054:ff:fec9:897c. RCV: X-- IA_NA 00:f3:99:a8 RCV: | X-- starts 1520535647 RCV: | X-- t1 - renew +3600 RCV: | X-- t2 - rebind +7200 RCV: | X-- [Options] RCV: | | X-- IAADDR 2001:db8::98 RCV: | | | X-- Preferred lifetime 604800. RCV: | | | X-- Max lifetime 2592000. RCV: X-- Server ID: 00:01:00:01:22:2c:61:12:52:54:00:c9:89:7c RCV: Advertisement recorded. PRC: Selecting best advertised lease. PRC: Considering best lease. PRC: X-- Initial candidate 00:01:00:01:22:2c:61:12:52:54:00:c9:89:7c (s: 155, p: 0). XMT: Forming Request, 0 ms elapsed. XMT: X-- IA_NA 00:f3:99:a8 XMT: | X-- Requested renew +3600 XMT: | X-- Requested rebind +5400 XMT: | | X-- IAADDR 2001:db8::98 XMT: | | | X-- Preferred lifetime +7200 XMT: | | | X-- Max lifetime +7500 XMT: V IA_NA appended. XMT: Request on ens7, interval 990ms. RCV: Reply message on ens7 from fe80::5054:ff:fec9:897c. RCV: X-- IA_NA 00:f3:99:a8 RCV: | X-- starts 1520535648 RCV: | X-- t1 - renew +3600 RCV: | X-- t2 - rebind +7200 RCV: | X-- [Options] RCV: | | X-- IAADDR 2001:db8::98 RCV: | | | X-- Preferred lifetime 604800. RCV: | | | X-- Max lifetime 2592000. RCV: X-- Server ID: 00:01:00:01:22:2c:61:12:52:54:00:c9:89:7c PRC: Bound to lease 00:01:00:01:22:2c:61:12:52:54:00:c9:89:7c. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718568 Title: dhclient-script fails to wait for link-local address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
Hello Jeff, or anyone else affected, Accepted isc-dhcp into artful-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/isc- dhcp/4.3.5-3ubuntu2.3 in a few hours, and then in the -proposed repository. Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed.Your feedback will aid us getting this update out to other Ubuntu users. If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested and change the tag from verification-needed-artful to verification-done-artful. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-artful. In either case, without details of your testing we will not be able to proceed. Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance! ** Changed in: isc-dhcp (Ubuntu Artful) Status: In Progress => Fix Committed ** Tags added: verification-needed verification-needed-artful ** Changed in: isc-dhcp (Ubuntu Xenial) Status: In Progress => Fix Committed ** Tags added: verification-needed-xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718568 Title: dhclient-script fails to wait for link-local address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
> Is there no other more reliable way to reproduce the case that's being fixed here sure yes, here's what i did; first, setup: -create VMs for the releases (T/X/A), managed by virsh (e.g. with uvt-kvm or whatever) -add a second interface to each of them, e.g.: $ virsh attach-interface lp1718568-artful network default --model virtio --persistent -set up another server/vm/container/whatever, connected to the same network as the test VM second interfaces, and install and configure isc- dhcp-server (or dnsmasq or whatever dhcpv6 server) on that to serve out dhcpv6 now on each release VM: -check the virsh interface you'll be using, e.g.: $ virsh domiflist lp1718568-artful Interface Type Source Model MAC --- vnet3 networkdefaultvirtio 52:54:00:3f:b9:ad vnet0 networkdefaultvirtio 52:54:00:bf:16:8a confirm which matches the test interface in the VM using mac; in my case it's vnet0. now, bring its link state down using virsh: $ virsh domif-setlink lp1718568-artful vnet0 down and ssh into the test VM (on its first, still working, default interface - or use virt-viewer or whatever) and test dhclient -6, making sure to first verify the test interface is down (i.e. that it doesn't already have a link-local addr): ubuntu@lp1718568-artful:~$ sudo ip a show ens7 3: ens7: mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000 link/ether 52:54:00:bf:16:8a brd ff:ff:ff:ff:ff:ff ubuntu@lp1718568-artful:~$ sudo dhclient -v -6 ens7 Internet Systems Consortium DHCP Client 4.3.5 Copyright 2004-2016 Internet Systems Consortium. All rights reserved. For info, please visit https://www.isc.org/software/dhcp/ no link-local IPv6 address for ens7 If you think you have received this message due to a bug rather than a configuration issue please read the section on submitting bugs on either our web page at www.isc.org or in the README file before submitting a bug. These pages explain the proper process and the information we find helpful for debugging.. exiting. as expected (for this bug), that fails immediately. now, upgrade to the test version in my ppa https://launchpad.net/~ddstreet/+archive/ubuntu/lp1718568 ubuntu@lp1718568-artful:~$ dpkg -l | grep isc-dhcp ii isc-dhcp-client 4.3.5-3ubuntu2.2+hf1718568v20180302b1amd64DHCP client for automatically obtaining an IP address ii isc-dhcp-common 4.3.5-3ubuntu2.2+hf1718568v20180302b1amd64common manpages relevant to all of the isc-dhcp packages again, make sure the interface is down (no link-local addr) and try the new dhclient: ubuntu@lp1718568-artful:~$ sudo ip l set down dev ens7 ubuntu@lp1718568-artful:~$ sudo ip a show ens7 3: ens7: mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000 link/ether 52:54:00:bf:16:8a brd ff:ff:ff:ff:ff:ff ubuntu@lp1718568-artful:~$ sudo dhclient -v -6 ens7 Internet Systems Consortium DHCP Client 4.3.5 Copyright 2004-2016 Internet Systems Consortium. All rights reserved. For info, please visit https://www.isc.org/software/dhcp/ now, instead of immediately exiting with error, it waits - this is where it's waiting for the interface to get a 'tentative' link-local address, and then complete dad to switch to normal link-local so dhcpv6 can begin. After only a few seconds (dhclient-script.linux defaults to 60 attempts, with 0.1 second delays between, so ~6 seconds of waiting) it will give up and exit as before: no link-local IPv6 address for ens7 If you think you have received this message due to a bug rather than a configuration issue please read the section on submitting bugs on either our web page at www.isc.org or in the README file before submitting a bug. These pages explain the proper process and the information we find helpful for debugging.. exiting. Ok, we verified the patch does force dhclient to wait for the link-local addr (even without any tentative addr); now bring the interface back down and re-test, but this time immediately switch back to the host and use virsh to bring the link state back up (before dhclient times out): ubuntu@lp1718568-artful:~$ sudo ip l set down dev ens7 ubuntu@lp1718568-artful:~$ sudo ip a show ens7 3: ens7: mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000 link/ether 52:54:00:bf:16:8a brd ff:ff:ff:ff:ff:ff ubuntu@lp1718568-artful:~$ sudo dhclient -v -6 ens7 Internet Systems Consortium DHCP Client 4.3.5 Copyright 2004-2016 Internet Systems Consortium. All rights reserved. For info, please visit https://www.isc.org/software/dhcp/ now quickly in the host: $ virsh domif-setlink lp1718568-artful vnet0 up Device updated successfully and back in the test VM: Listening on Socket/ens7 Sending on Socket/ens7 PRC: Soliciting for leases (INIT). XMT: Forming Solicit, 0 ms elapsed. XMT: X-- IA_NA 00:bf:16:8a XMT: | X-- Request renew in +3600 XMT:
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
ok i'll recreate the debdiffs and reupload. ** Tags removed: verification-needed verification-needed-artful verification-needed-trusty verification-needed-xenial ** Changed in: isc-dhcp (Ubuntu Artful) Status: Fix Committed => In Progress ** Changed in: isc-dhcp (Ubuntu Xenial) Status: Fix Committed => In Progress ** Changed in: isc-dhcp (Ubuntu Trusty) Status: Fix Committed => In Progress -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718568 Title: dhclient-script fails to wait for link-local address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
Unfortunately, this SRU was superseded by a security update. New debdiffs need to be prepared on top of the security updates. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718568 Title: dhclient-script fails to wait for link-local address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
I will be accepting this, but I'm a bit worried about the test case here as it relies on a race-related occasional failure and it might be hard to test reliably. Is there no other more reliable way to reproduce the case that's being fixed here, e.g. to delay the initial tentative link- local address assignment? Probably not? ** Changed in: isc-dhcp (Ubuntu Artful) Status: In Progress => Fix Committed ** Tags added: verification-needed verification-needed-artful -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718568 Title: dhclient-script fails to wait for link-local address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
This bug was fixed in the package isc-dhcp - 4.3.5-3ubuntu4 --- isc-dhcp (4.3.5-3ubuntu4) bionic; urgency=medium * dhclient-script.linux: handle empty case also when waiting for ipv6 link local DAD. (LP: #1718568) -- Dan Streetman Thu, 12 Oct 2017 08:48:06 -0400 ** Changed in: isc-dhcp (Ubuntu Bionic) Status: In Progress => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718568 Title: dhclient-script fails to wait for link-local address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
** Patch added: "lp1718568-bionic.debdiff" https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+attachment/5059088/+files/lp1718568-bionic.debdiff -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718568 Title: dhclient-script fails to wait for link-local address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
** Changed in: isc-dhcp (Ubuntu Zesty) Status: In Progress => Won't Fix -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718568 Title: dhclient-script fails to wait for link-local address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
** Changed in: isc-dhcp (Ubuntu Bb-series) Status: New => In Progress ** Changed in: isc-dhcp (Ubuntu Bb-series) Importance: Undecided => Medium ** Changed in: isc-dhcp (Ubuntu Bb-series) Assignee: (unassigned) => Dan Streetman (ddstreet) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718568 Title: dhclient-script fails to wait for link-local address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
** Also affects: isc-dhcp (Ubuntu Bb-series) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718568 Title: dhclient-script fails to wait for link-local address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
Hi Jeff, Thanks for reporting and debugging this! I've tweaked your patch from comment 2 slightly, you can see my version in the debdiffs attached. I was concerned that just a " " check may not always work right, so I explicitly check for the ip output to contain 'inet6' (but not 'tentative') which is really what the function is supposed to be doing. Since this needs to go into the development release, the SRUs to older releases have to wait. And since artful is currently in freeze, this will need to wait for the b-series development to start before we can add the fix, and then SRU the fixes back to artful and older. I'll come back to this once b-series development has started and get the process rolling. Until then, I built test packages here: https://launchpad.net/~ddstreet/+archive/ubuntu/lp1718568 can you verify that fixes it on your system? ** Description changed: + [impact] + + bug 1633479 made a change to isc-dhcp to wait for an interface's link-local ipv6 address to switch from 'tentative' to normal, because all link-local addresses briefly go through a 'tentative' state while the kernel is performing ipv6 link-local 'duplicate address detection' (DAD). While in the 'tentative' state, dhclient can't take over the interface and send out + dhcpv6 requests; it must wait until DAD completes. + + However, the change made in that bug does not account for the case where + the 'tentative' check is done before the interface has even set up a + link-local address; its case statement assumes if there is no + 'tentative' or 'dadfailed' string in the output, the link-local address + is ready to use. When the address check finds no address at all, this + will return as successful, even though it shouldn't, and dhclient will + fail to get the dhcpv6 address. + + [test case] + + on a system that is configured for dhcpv6 on one or more of its + interfaces, repeatedly try to get the dhcpv6 address. For interfaces + that are slower to actually set up their initial tentative link-local + address, they will occasionally fail, since the current code is a race + between the kernel adding the tentative link-local address, and the + dhclient-script.linux code checking the interface for a tentative + address. + + with the patch to correct this, even interfaces slow to add their + tentative link-local address should correctly wait for the address to + get added, and then transition from tentative to normal, and then begin + the dhcpv6 process. + + [regression potential] + + errors in this function can cause dhclient to fail to get a ipv6 address + for an interface; regression would happen if this patch makes it fail + more than it already is failing, but would not cause other failures or + problems after getting an ipv6 address; this patch will affect only + startup-time. + + [other info] + + related bug 1633479 + + + [original description] + + Summary: If a interface does not yet have a link-local address (as it may have just been brought up), dhclient -6 will fail. The built-in "wait for link-local address" loop does not function properly, causing DHCP failure. Discussion: === In trying to configure isc-dhcp-client 4.3.5-3ubuntu1 for IPv6 on Ubuntu 17.04, I was finding that on boot I was getting failures with the logged message "no link-local IPv6 address for " I found that it took several seconds for the link-local address to be assigned when the interface came up (in this case, the ISP/modem-facing interface), and worked around it with a script that looks at /sbin/ifconfig $IFACE | /bin/fgrep -q 'scopeid 0x20' and loops for a fixed number of times for that to be successful. On looking at /sbin/dhclient-script it appears that it *tries* to do the same thing in # set the link up and wait for ipv6 link local dad to finish ipv6_link_up_and_dad() this code sets out=$(ip -6 -o address show dev "$dev" scope link) then checks it with a case statement inside of a loop for case " $out " in *\ dadfailed\ *) error "$dev: ipv6 dad failed." return 1;; *\ tentative\ *) :;; *) return 0;; esac If there is no link-local address, $out will be empty. The default case is taken, and the loop exits immediately: $ echo "'$out'" ; case " $out " in > *\ dadfailed\ *) > echo "dadfailed" > ;; > *\ tentative\ *) > echo "tentative" > ;; > *) > echo "default" > esac '' default As a result, there is no "wait for link-local address" and when there is no link-local address, dhclient fails later on. Possible Fix: = Adding "the missing case" for "no address" case that continues the loop is one possible solution. .case " $out " in .*\ dadfailed\ *) .error "$dev: i
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
** Patch added: "lp1718568-trusty.debdiff" https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+attachment/4968659/+files/lp1718568-trusty.debdiff -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718568 Title: dhclient-script fails to wait for link-local address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
** Patch added: "lp1718568-artful.debdiff" https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+attachment/4968656/+files/lp1718568-artful.debdiff -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718568 Title: dhclient-script fails to wait for link-local address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
** Patch added: "lp1718568-zesty.debdiff" https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+attachment/4968657/+files/lp1718568-zesty.debdiff -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718568 Title: dhclient-script fails to wait for link-local address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
** Patch added: "lp1718568-xenial.debdiff" https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+attachment/4968658/+files/lp1718568-xenial.debdiff -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718568 Title: dhclient-script fails to wait for link-local address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
** Changed in: isc-dhcp (Ubuntu Trusty) Assignee: (unassigned) => Dan Streetman (ddstreet) ** Changed in: isc-dhcp (Ubuntu Xenial) Assignee: (unassigned) => Dan Streetman (ddstreet) ** Changed in: isc-dhcp (Ubuntu Zesty) Assignee: (unassigned) => Dan Streetman (ddstreet) ** Changed in: isc-dhcp (Ubuntu Artful) Assignee: (unassigned) => Dan Streetman (ddstreet) ** Changed in: isc-dhcp (Ubuntu Artful) Importance: Undecided => Medium ** Changed in: isc-dhcp (Ubuntu Zesty) Importance: Undecided => Medium ** Changed in: isc-dhcp (Ubuntu Trusty) Importance: Undecided => Medium ** Changed in: isc-dhcp (Ubuntu Xenial) Importance: Undecided => Medium ** Changed in: isc-dhcp (Ubuntu Artful) Status: New => In Progress ** Changed in: isc-dhcp (Ubuntu Zesty) Status: New => In Progress ** Changed in: isc-dhcp (Ubuntu Xenial) Status: New => In Progress ** Changed in: isc-dhcp (Ubuntu Trusty) Status: New => In Progress -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718568 Title: dhclient-script fails to wait for link-local address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
** Also affects: isc-dhcp (Ubuntu Artful) Importance: Undecided Status: New ** Also affects: isc-dhcp (Ubuntu Trusty) Importance: Undecided Status: New ** Also affects: isc-dhcp (Ubuntu Xenial) Importance: Undecided Status: New ** Also affects: isc-dhcp (Ubuntu Zesty) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718568 Title: dhclient-script fails to wait for link-local address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
** Changed in: isc-dhcp (Debian) Status: Unknown => New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718568 Title: dhclient-script fails to wait for link-local address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
The attachment "Patch to detect no link-local address" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu- reviewers, unsubscribe the team. [This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.] ** Tags added: patch -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718568 Title: dhclient-script fails to wait for link-local address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
Confirmed to resolve issue seen here. I won't be concerned if you prefer alternate sh-script formatting over mine. ** Patch added: "Patch to detect no link-local address" https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+attachment/4954114/+files/dhclient-script.diff ** Description changed: Summary: If a interface does not yet have a link-local address (as it may have just been brought up), dhclient -6 will fail. The built-in "wait for link-local address" loop does not function properly, causing DHCP failure. Discussion: === In trying to configure isc-dhcp-client 4.3.5-3ubuntu1 for IPv6 on Ubuntu 17.04, I was finding that on boot I was getting failures with the logged message "no link-local IPv6 address for " I found that it took several seconds for the link-local address to be assigned when the interface came up (in this case, the ISP/modem-facing interface), and worked around it with a script that looks at /sbin/ifconfig $IFACE | /bin/fgrep -q 'scopeid 0x20' and loops for a fixed number of times for that to be successful. On looking at /sbin/dhclient-script it appears that it *tries* to do the same thing in # set the link up and wait for ipv6 link local dad to finish ipv6_link_up_and_dad() this code sets out=$(ip -6 -o address show dev "$dev" scope link) then checks it with a case statement inside of a loop for case " $out " in *\ dadfailed\ *) error "$dev: ipv6 dad failed." return 1;; *\ tentative\ *) :;; *) return 0;; esac If there is no link-local address, $out will be empty. The default case is taken, and the loop exits immediately: $ echo "'$out'" ; case " $out " in > *\ dadfailed\ *) > echo "dadfailed" > ;; > *\ tentative\ *) > echo "tentative" > ;; > *) > echo "default" > esac '' default As a result, there is no "wait for link-local address" and when there is no link-local address, dhclient fails later on. Possible Fix: = Adding "the missing case" for "no address" case that continues the loop is one possible solution. - case " $out " in - *\ dadfailed\ *) - error "$dev: ipv6 dad failed." - return 1;; - *\ tentative\ *) :;; - " ") - : - ;; - *) return 0;; - esac + .case " $out " in + .*\ dadfailed\ *) + .error "$dev: ipv6 dad failed." + .return 1;; + .*\ tentative\ *) :;; + + " ") + + : + + ;; + .*) return 0;; + .esac At least in my situation, this prevents the failure of dhclient due to the link-local address not being "ready" yet. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718568 Title: dhclient-script fails to wait for link-local address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1718568] Re: dhclient-script fails to wait for link-local address
Confirmed that the same apparent flaw in dhclient-script appears to exist in 4.3.3-5ubuntu12.7 under Ubuntu 16.04.3 LTS This appears related to / caused by LP: #1633479 based on http://launchpadlibrarian.net/291516262/isc-dhcp_4.3.3-5ubuntu15_4.3.3-5ubuntu15.1.diff.gz ** Description changed: Summary: If a interface does not yet have a link-local address (as it may have just been brought up), dhclient -6 will fail. The built-in "wait for link-local address" loop does not function properly, causing DHCP failure. Discussion: === In trying to configure isc-dhcp-client 4.3.5-3ubuntu1 for IPv6 on Ubuntu 17.04, I was finding that on boot I was getting failures with the logged message "no link-local IPv6 address for " I found that it took several seconds for the link-local address to be assigned when the interface came up (in this case, the ISP/modem-facing interface), and worked around it with a script that looks at /sbin/ifconfig $IFACE | /bin/fgrep -q 'scopeid 0x20' and loops for a fixed number of times for that to be successful. On looking at /sbin/dhclient-script it appears that it *tries* to do the same thing in # set the link up and wait for ipv6 link local dad to finish ipv6_link_up_and_dad() this code sets out=$(ip -6 -o address show dev "$dev" scope link) then checks it with a case statement inside of a loop for case " $out " in *\ dadfailed\ *) error "$dev: ipv6 dad failed." return 1;; *\ tentative\ *) :;; *) return 0;; esac If there is no link-local address, $out will be empty. The default case is taken, and the loop exits immediately: $ echo "'$out'" ; case " $out " in > *\ dadfailed\ *) > echo "dadfailed" > ;; > *\ tentative\ *) > echo "tentative" > ;; > *) > echo "default" > esac '' default As a result, there is no "wait for link-local address" and when there is no link-local address, dhclient fails later on. Possible Fix: = Adding "the missing case" for "no address" case that continues the loop is one possible solution. case " $out " in *\ dadfailed\ *) error "$dev: ipv6 dad failed." return 1;; *\ tentative\ *) :;; - " ") - : - ;; + " ") + : + ;; *) return 0;; esac At least in my situation, this prevents the failure of dhclient due to the link-local address not being "ready" yet. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718568 Title: dhclient-script fails to wait for link-local address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1718568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs