[Bug 1255516] Re: Network access broken to some hosts after some usage...

[Eriberto]

Forwarding because it isn't a core-network problem.

Thanks.


** Package changed: core-network (Ubuntu) => netbase (Ubuntu)

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Title:
  Network access broken to some hosts after some usage...

Status in “netbase” package in Ubuntu:
  Triaged

Bug description:
  Hi,

  I'm suffering something that's strange. I think it's related to dhcp
  but really don't know.

  I configured my server to use dhcp so it can receive dns updates and
  ip on each boot. Among using PXE with maas for booting.

  The problem is that I found that it looses network access from time to
  time. The only way to recover the network is by doing ifdown br0 &&
  ifup br0.

  Since this is a virtualization server everytime I do this, the virtual
  machines loose also the network so I have to restart each one.

  I tried to change to another switch/router because I suspected that
  link is broken from time to time and this caused dhcpd to rerun,
  broking the configuration given at boot. It made no change.

  I changed the interface to which br0 is bridged from eth0 (internal
  asus motherboard link) to eth2 (intel PRO card pci/e). It made no
  change.

  So I'm lost on what's the problem. I've just changed the configuration
  to static ip and it seems to work now, but I have to test it more, and
  with heavy load.

  This is old log, with eth0 in place

  Nov 26 05:29:11 red1 kernel: [29995.675232] br0: port 1(eth0) entered disabled state
  Nov 26 05:29:11 red1 avahi-daemon[1508]: Interface br0.IPv6 no longer relevant for mDNS.
  Nov 26 05:29:11 red1 avahi-daemon[1508]: Leaving mDNS multicast group on interface br0.IPv6 with address fe80::224:8cff:fe3b:c700.
  Nov 26 05:29:11 red1 avahi-daemon[1508]: Withdrawing address record for fe80::224:8cff:fe3b:c700 on br0.
  Nov 26 05:29:11 red1 charon: 02[KNL] fe80::224:8cff:fe3b:c700 disappeared from br0
  Nov 26 05:29:11 red1 charon: 02[KNL] interface eth0 deactivated
  Nov 26 05:29:11 red1 charon: 02[KNL] interface eth0 deleted
  Nov 26 05:29:11 red1 kernel: [29995.723958] device eth0 left promiscuous mode
  Nov 26 05:29:11 red1 kernel: [29995.723971] br0: port 1(eth0) entered disabled state
  Nov 26 05:29:11 red1 kernel: [29995.730646] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
  Nov 26 05:29:11 red1 charon: 02[KNL] interface vnet1 deleted
  Nov 26 05:29:11 red1 charon: 02[KNL] interface vnet0 deleted
  Nov 26 05:29:11 red1 charon: 02[KNL] interface br0 deleted
  Nov 26 05:29:11 red1 avahi-daemon[1508]: Withdrawing workstation service for br0.
  Nov 26 05:29:11 red1 kernel: [29995.732532] device vnet1 left promiscuous mode
  Nov 26 05:29:11 red1 kernel: [29995.732546] br0: port 3(vnet1) entered disabled state
  Nov 26 05:29:11 red1 kernel: [29995.733670] device vnet0 left promiscuous mode
  Nov 26 05:29:11 red1 kernel: [29995.733680] br0: port 2(vnet0) entered disabled state
  Nov 26 05:29:11 red1 kernel: [29995.734800] device br0 left promiscuous mode
  Nov 26 05:29:11 red1 NetworkManager[3392]:    SCPlugin-Ifupdown: devices removed (path: /sys/devices/virtual/net/br0, iface: br0)
  Nov 26 05:29:12 red1 kernel: [29995.793763] device eth0 entered promiscuous mode
  Nov 26 05:29:12 red1 charon: 02[KNL] interface eth0 activated
  Nov 26 05:29:12 red1 kernel: [29995.804671] r8169 0000:05:00.0 eth0: link down
  Nov 26 05:29:12 red1 kernel: [29995.804688] r8169 0000:05:00.0 eth0: link down
  Nov 26 05:29:12 red1 kernel: [29995.805141] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
  :

  
  Any idea on what can it be?

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