** Changed in: network-manager
Status: Confirmed => Fix Released
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Title:
dhclient killed when DHCPv6 lease is out-of date
To manage
root@gw:~# cat /var/lib/dhcp/dhclient6.br1.leases
default-duid "\000\001\000\001 \302\271\313\000\002D\032>\251";
lease6 {
interface "br1";
ia-na 44:1a:3e:a9 {
starts 1496317261;
renew 900;
rebind 1500;
iaaddr 2a02:2168:82d:949::1 {
starts 1496317261;
preferred-life
I have no Network Manager in Ubuntu server 16.04 LTS, but this bug present.
After booting where is no dhclient in the processes if accept_ra set to 2 and
syslog contains
Jun 1 13:55:33 gw dhclient[3663]: PRC: Prefix 2a02:2168:176b:4800::/56
depreferred.
Jun 1 14:05:44 gw dhclient[2762]: PRC:
As a temporary work-around on my ubuntu machine, I added the following
line to /lib/systemd/system/NetworkManager.service in the [Service]
section:
ExecStartPre=-/bin/sh -c 'rm -f
/var/lib/NetworkManager/dhclient6-*.lease'
Now I get DHCPv6 leases again, even if my machine was powered off for
Same problem on xubuntu 16.10 with:
network-manager 1.2.4-0ubuntu1
isc-dhcp-client 4.3.3-5ubuntu15
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Title:
dhclient killed when DHCPv6 lease is
This problem has been happening to me recently with up to date Ubuntu
16.04 amd64 desktop.
Workaround is to clean up the broken state by removing all leases:
1. Disconnect from the network in Network Manager
2. Execute: sudo rm /var/lib/NetworkManager/dhclient*.lease
3. Connect to the network in
I'm getting DOS'd about 20 times a day as a result of this issue.
Could a "band-aid" shell script be whipped up by anyone in the know, to
physically purge the expired lease files periodically, and posted here?
I would gladly set such a script to run as a "cleanup service" or even
run it
It seems there's a deficiency in isc-dhcp client that leads to this.
Fedora have been carrying a patch since 2013 that solves it by the
simple expedient of scanning the .lease file first for unexpired leases
before allocate an address.
See:
** Changed in: isc-dhcp (Ubuntu)
Status: Invalid => In Progress
** Changed in: isc-dhcp (Ubuntu)
Importance: Low => High
** Changed in: isc-dhcp (Ubuntu)
Assignee: (unassigned) => TJ (tj)
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** Changed in: network-manager (Ubuntu)
Assignee: (unassigned) => TJ (tj)
** Changed in: network-manager (Ubuntu)
Status: Triaged => In Progress
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** Summary changed:
- Failed to renew DHCPv6 lease after suspend
+ dhclient killed when DHCPv6 lease is out-of date
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https://bugs.launchpad.net/bugs/1533631
Title:
dhclient killed
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