[Bug 1551351] Re: dhclient does not renew leases

[Alon Albert]

I believe I am still affected by this bug.

$ dhclient --version
isc-dhclient-4.3.3

My lease is for 24 hours and every day, I get disconnected. If I
disconnect and reconnect the Ethernet cable, connection is restored.

kern.log shows this pattern:

Jan 24 03:17:12 kubuntu NetworkManager[1132]: <info>  [1485220632.3687]   address 10.0.0.6
Jan 24 03:17:12 kubuntu NetworkManager[1132]: <info>  [1485220632.3957]   plen 24 (255.255.255.0)
Jan 24 03:17:12 kubuntu NetworkManager[1132]: <info>  [1485220632.3957]   gateway 10.0.0.200
Jan 24 03:17:12 kubuntu NetworkManager[1132]: <info>  [1485220632.3957]   server identifier 10.0.0.200
Jan 24 03:17:12 kubuntu NetworkManager[1132]: <info>  [1485220632.3958]   lease time 86400
Jan 24 03:17:12 kubuntu NetworkManager[1132]: <info>  [1485220632.3958]   hostname 'kubuntu'
Jan 24 03:17:12 kubuntu NetworkManager[1132]: <info>  [1485220632.3958]   nameserver '8.8.8.8'
Jan 24 03:17:12 kubuntu NetworkManager[1132]: <info>  [1485220632.3958]   nameserver '10.0.0.200'
Jan 24 03:17:12 kubuntu NetworkManager[1132]: <info>  [1485220632.4108] dhcp4 (enp1s0): state changed bound -> bound
Jan 25 03:18:24 kubuntu kernel: [377372.984065] CIFS VFS: Server 10.0.0.2 has not responded in 120 seconds. Reconnecting...

You can see that on Jan 24 at 3:17 I got a 24 hour lease. On Jan 25 at
3:18, almost exactly 24 hours later, I get a network error. There is
nothing in between.


This pattern repeats itself every day at around the same time.

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https://bugs.launchpad.net/bugs/1551351

Title:
  dhclient does not renew leases

Status in bind9 package in Ubuntu:
  Fix Released
Status in isc-dhcp package in Ubuntu:
  Fix Released
Status in bind9 source package in Xenial:
  Fix Released
Status in isc-dhcp source package in Xenial:
  Fix Released

Bug description:
  Release: Xenial

  I think this only recently started after some bind9 updates triggered a rebuild. When booting dhclient gets started and acquires an IP address, but it does seem to lock up somewhere as it does not renew the lease.
  In my environment I set the lease time to 5 minutes, so I notice such things rather soon. I looked on the dhcp server side but saw any further dhcp messages come in from the client side.

  Related bugs:
   * bug 1551415:  systemctl stop networking hang / timeout 

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: isc-dhcp-client 4.3.3-5ubuntu8
  ProcVersionSignature: Ubuntu 4.4.0-9.24-generic 4.4.3
  Uname: Linux 4.4.0-9-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  Date: Mon Feb 29 12:32:52 2016
  DhclientLeases:

  SourcePackage: isc-dhcp
  UpgradeStatus: No upgrade log present (probably fresh install)

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