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

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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?

** Affects: netbase (Ubuntu)
     Importance: Undecided
         Status: New

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Network access broken to some hosts after some usage...
https://bugs.launchpad.net/bugs/1255516
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