Public bug reported:
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: core-network (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1255516
Title:
Network access broken when interface is configured with dhcp
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