Hi Alkis, thank you for your report and your help to make Ubuntu better. I like your preanalysis and agree to your assumption of some sort of bad initialization.
This bug is present in Debian too, and Ubuntu currently doesn't make any changes over the Debian package. So this bug would be best fixed directly in Debian, and then Ubuntu will pick up the fix automatically. The only delta you see in Xenial is a security fix, so not a lot of "Ubuntu special" that could break it. Also the versions are pretty much up to date - 2.76 as in Yakkety is the latest upstream. I checked the changelog but there is no mentioning of the issue you are facing, yet if easily possible for you it might be worth checking the same on Yakkety or even Zesty. I almost assume that it might be an upstream issue with dnsmasq itself, but in that case as well Debian should be notified to be able to pick it up as well. You clearly have the best setup to reproduce if any more questions come in, therefore would you mind filing a bug with Debian and/or upstream and link it here please? ** Tags added: needs-upstream-report -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to dnsmasq in Ubuntu. https://bugs.launchpad.net/bugs/1651044 Title: ProxyDHCP replies on invalid range Status in dnsmasq package in Ubuntu: New Bug description: In Ubuntu 16.04, I've configured dnsmasq to reply on subnet=10.160.37.0/24, yet it replies even when it gets an IP on subnet=10.161.254.0/24. I've only seen this after clean system restart. If I restart dnsmasq later on, it works as expected. Maybe when dnsmasq starts, the network isn't up yet, and it incorrectly initializes some networking information? I'm using network-manager with DHCP. Details: $ egrep -rv '^#|^$' /etc/dnsmasq.* /etc/dnsmasq.d/ltsp-server-dnsmasq.conf:dhcp-range=10.160.37.0,proxy /etc/dnsmasq.d/ltsp-server-dnsmasq.conf:dhcp-range=192.168.67.20,192.168.67.250,8h /etc/dnsmasq.d/ltsp-server-dnsmasq.conf:enable-tftp /etc/dnsmasq.d/ltsp-server-dnsmasq.conf:tftp-root=/var/lib/tftpboot/ /etc/dnsmasq.d/ltsp-server-dnsmasq.conf:dhcp-option=17,/opt/ltsp/i386 /etc/dnsmasq.d/ltsp-server-dnsmasq.conf:dhcp-vendorclass=etherboot,Etherboot /etc/dnsmasq.d/ltsp-server-dnsmasq.conf:dhcp-vendorclass=pxe,PXEClient /etc/dnsmasq.d/ltsp-server-dnsmasq.conf:dhcp-vendorclass=ltsp,"Linux ipconfig" /etc/dnsmasq.d/ltsp-server-dnsmasq.conf:dhcp-boot=net:pxe,/ltsp/i386/pxelinux.0 /etc/dnsmasq.d/ltsp-server-dnsmasq.conf:dhcp-boot=net:etherboot,/ltsp/i386/nbi.img /etc/dnsmasq.d/ltsp-server-dnsmasq.conf:dhcp-boot=net:ltsp,/ltsp/i386/lts.conf /etc/dnsmasq.d/ltsp-server-dnsmasq.conf:dhcp-option=vendor:pxe,6,2b /etc/dnsmasq.d/ltsp-server-dnsmasq.conf:dhcp-no-override /etc/dnsmasq.d/ltsp-server-dnsmasq.conf:pxe-service=X86PC, "Boot from network", /ltsp/i386/pxelinux $ ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: enp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether d0:50:99:a6:bc:0a brd ff:ff:ff:ff:ff:ff inet 10.161.254.185/24 brd 10.161.254.255 scope global dynamic enp2s0 valid_lft 431873sec preferred_lft 431873sec inet6 fe80::f363:c1e2:9cb8:d9e2/64 scope link valid_lft forever preferred_lft forever $ sudo netstat -nap | grep dnsmasq [sudo] password for administrator: tcp 0 0 0.0.0.0:53 0.0.0.0:* LISTEN 843/dnsmasq tcp6 0 0 :::53 :::* LISTEN 843/dnsmasq udp 0 0 0.0.0.0:53 0.0.0.0:* 843/dnsmasq udp 0 0 0.0.0.0:67 0.0.0.0:* 843/dnsmasq udp 0 0 0.0.0.0:69 0.0.0.0:* 843/dnsmasq udp 0 0 0.0.0.0:4011 0.0.0.0:* 843/dnsmasq udp6 0 0 :::53 :::* 843/dnsmasq udp6 0 0 :::69 :::* 843/dnsmasq unix 2 [ ] DGRAM 15746 843/dnsmasq $ grep dnsmasq /var/log/syslog | tail -n 30 Dec 19 10:52:17 ltsp-server systemd[1]: Starting dnsmasq - A lightweight DHCP and caching DNS server... Dec 19 10:52:17 ltsp-server dnsmasq[630]: dnsmasq: syntax check OK. Dec 19 10:52:20 ltsp-server dnsmasq[843]: started, version 2.75 cachesize 150 Dec 19 10:52:20 ltsp-server dnsmasq[843]: compile time options: IPv6 GNU-getopt DBus i18n IDN DHCP DHCPv6 no-Lua TFTP conntrack ipset auth DNSSEC loop-detect inotify Dec 19 10:52:20 ltsp-server dnsmasq[843]: DNS service limited to local subnets Dec 19 10:52:20 ltsp-server dnsmasq-dhcp[843]: DHCP, IP range 192.168.67.20 -- 192.168.67.250, lease time 8h Dec 19 10:52:20 ltsp-server dnsmasq-dhcp[843]: DHCP, proxy on subnet 10.160.37.0 Dec 19 10:52:20 ltsp-server dnsmasq-tftp[843]: TFTP root is /var/lib/tftpboot/ Dec 19 10:52:20 ltsp-server dnsmasq[843]: no servers found in /var/run/dnsmasq/resolv.conf, will retry Dec 19 10:52:20 ltsp-server dnsmasq[843]: read /etc/hosts - 7 addresses Dec 19 10:52:23 ltsp-server systemd[1]: Started dnsmasq - A lightweight DHCP and caching DNS server. Dec 19 10:52:29 ltsp-server dnsmasq[843]: reading /var/run/dnsmasq/resolv.conf Dec 19 10:52:29 ltsp-server dnsmasq[843]: ignoring nameserver 127.0.0.1 - local interface Dec 19 10:52:29 ltsp-server dnsmasq[843]: using nameserver 194.63.238.4#53 Dec 19 10:52:29 ltsp-server dnsmasq[843]: using nameserver 8.8.8.8#53 Dec 19 08:52:47 ltsp-server dnsmasq-dhcp[843]: PXE(enp2s0) 52:54:00:8f:74:ad proxy Dec 19 08:52:47 ltsp-server dnsmasq-dhcp[843]: PXE(enp2s0) 10.161.254.195 52:54:00:8f:74:ad /ltsp/i386/pxelinux.0 Dec 19 08:52:47 ltsp-server dnsmasq-tftp[843]: sent /var/lib/tftpboot/ltsp/i386/pxelinux.0 to 10.161.254.195 ... Note that it replies in "52:54:00:8f:74:ad proxy" while it shouldn't. If I run this: # service dnsmasq restart Then it behaves correctly: Dec 19 09:01:17 ltsp-server dnsmasq-dhcp[2381]: no address range available for DHCP request via enp2s0 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/dnsmasq/+bug/1651044/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
