[Bug 1551351] Re: dhclient does not renew leases

[Mike Carifio]

I did a fresh install of artful on a shuttle SZ170 with the following
ethernet adapters according to `lshw`:

          *-network
                description: Ethernet interface
                product: I211 Gigabit Network Connection
                vendor: Intel Corporation
                physical id: 0
                bus info: pci at 0000:03:00.0
                logical name: enp3s0
                version: 03
                serial: 80:ee:73:c8:ec:1a
                size: 1Gbit/s
                capacity: 1Gbit/s
                width: 32 bits
                clock: 33MHz
                capabilities: pm msi msix pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
                configuration: autonegotiation=on broadcast=yes driver=igb driverversion=5.4.0-k duplex=full firmware=0. 6-1 ip=192.168.0.14 latency=0 link=yes multicast=yes port=twisted 

and

        *-network
             description: Ethernet interface
             product: Ethernet Connection (2) I219-LM
             vendor: Intel Corporation
             physical id: 1f.6
             bus info: pci at 0000:00:1f.6
             logical name: enp0s31f6
             version: 31
             serial: 80:ee:73:c8:ec:1b
             size: 1Gbit/s
             capacity: 1Gbit/s
             width: 32 bits
             clock: 33MHz
             capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
             configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k duplex=full firmware=0.8-4 latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
             resources: irq:126 memory:df200000-df21ffff



I have dhclient and bind9 installed:

root at atlantis:~# dhclient --version
isc-dhclient-4.3.5
root at atlantis:~# dpkg --list|grep -i dhc
ii  dnsmasq-base                               2.78-1                                      amd64        Small caching DNS proxy and DHCP/TFTP server
ii  isc-dhcp-client                            4.3.5-3ubuntu2                              amd64        DHCP client for automatically obtaining an IP address
ii  isc-dhcp-common                            4.3.5-3ubuntu2                              amd64        common manpages relevant to all of the isc-dhcp packages
root at atlantis:~# dpkg --list|grep -i bind9
ii  bind9-host                                 1:9.10.3.dfsg.P4-12.6ubuntu1                amd64        Version of 'host' bundled with BIND 9.X
ii  libbind9-140:amd64                         1:9.10.3.dfsg.P4-12.6ubuntu1                amd64        BIND9 Shared Library used by BIND

I've disabled the second ethernet adapter. Periodically `enp3s0` looses
its IP address which it got via dhcp from my cable router. I think its
related to this bug. I understand the basics of dhcp (I can run some
commands), so I don't know the next steps to continue the diagnosis.

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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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