[Bug 1551351] Re: dhclient does not renew leases

[Doug Smythies]

>From Stephan comment 14:

"Hm, of course, if one starts dhclient in debug mode (foreground) by
adding a "-d", everything does work."

Yes, that does seem to work, but only for about another day, at least in
my case. Thereafter, my ISP stopped returning my domain name, host name
and some other stuff, and would only renew the lease for 1 hour instead
of the normal 1 day. I suppose it doesn't matter because, I use
supersede directives for that stuff anyhow. From my tcpdump captures, I
have not been able to determine what, if anything, is different in the
request, including the option parameter list request.

In my opinion, this bug report should have an importance level of
critical.

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

Title:
  dhclient does not renew leases

Status in bind9 package in Ubuntu:
  Confirmed
Status in isc-dhcp package in Ubuntu:
  Confirmed
Status in bind9 source package in Xenial:
  Confirmed
Status in isc-dhcp source package in Xenial:
  Confirmed

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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