I can confirm the problem in Ubuntu 14.04.1 server: I configured a
bridge for openvpn:
iface br0 inet static
address 192.168.1.6
netmask 255.255.255.0
gateway 192.168.1.1
bridge_ports eth0 tap0
dns-nameservers 192.168.1.1
dns-search mydomain.com
pre-up openvpn --mktun --dev tap0
post-down openvpn --rmtun --dev tap0
and for 50% of computer boots (20% on a slower pc) the br0 setup fails
and contains only tap0.
After some debugging, here are my guesses: I found that "brctl addbr br0" is
called twice: from /lib/bridge-utils/ifupdown.sh and from
/lib/udev/bridge-network-interface (the second one via udev due to openvpn
--mktun ???).
When ifupdown.sh is called after bridge-network-interface, "brctl addbr br0"
fails and returns nonzero, so the script exits and no interface are added to
br0.
When the two scripts are called in the reverse order, all seems to work fine.
I used the proposed workaround to put BRIDGE_HOTPLUG=no /etc/default
/bridge-utils in and now my system is working.
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https://bugs.launchpad.net/bugs/1313796
Title:
[No Network] ifupdown/bridge-utils & udev/bridge-utils race condition
preventing the addition of non-pre-up ports to a bridge
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