Package: bridge-utils
Version: 1.6-2
I have the following bridge configuration:
auto br0
iface br0 inet dhcp
bridge_ports eno1
bridge_stp off
bridge_maxwait 0
bridge_fd 0
bridge_hw 0c:c4:7a:33:46:a6
post-up ip link set eno1 txqueuelen 4000
post-up ip link set br0 txqueuelen 4000
Where 0c:c4:7a:33:46:a6 is the (real) MAC address of my eno1 interface.
After upgrading to the latest testing version of all the packages, I now
observe what appears to be the bridge_hw address most of the time being
ignored and some random address being used instead (76:95:e6:8c:c3:9e).
Here is a sample transcript:
$ ifup br0
Listening on LPF/br0/76:95:e6:8c:c3:9e
Sending on LPF/br0/76:95:e6:8c:c3:9e
Sending on Socket/fallback
DHCPDISCOVER on br0 to 255.255.255.255 port 67 interval 6
DHCPDISCOVER on br0 to 255.255.255.255 port 67 interval 15
DHCPDISCOVER on br0 to 255.255.255.255 port 67 interval 21
DHCPOFFER of 10.0.253.96 from 10.0.0.1
DHCPREQUEST for 10.0.253.96 on br0 to 255.255.255.255 port 67
DHCPACK of 10.0.253.96 from 10.0.0.1
bound to 10.0.253.96 -- renewal in 3159 seconds.
$ ip add show
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master br0 state
UP group default qlen 4000
link/ether 0c:c4:7a:33:46:a6 brd ff:ff:ff:ff:ff:ff
17: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
group default qlen 4000
link/ether 76:95:e6:8c:c3:9e brd ff:ff:ff:ff:ff:ff
inet 10.0.253.96/8 brd 10.255.255.255 scope global dynamic br0
valid_lft 6644sec preferred_lft 6644sec
inet6 fe80::7495:e6ff:fe8c:c39e/64 scope link
valid_lft forever preferred_lft forever
Sometimes, however, I do get the correct MAC assigned. So to me this feels
like some kind of a race.
Based on the discussion in bug #725786 I was able to come up with the
following workaround which appears to work reliably:
auto br0
iface br0 inet dhcp
bridge_ports eno1
bridge_stp off
bridge_maxwait 0
bridge_fd 0
bridge_hw 0c:c4:7a:33:46:a6
hwaddress 0c:c4:7a:33:46:a6
post-up ip link set br0 address 0c:c4:7a:33:46:a6
post-up ip link set eno1 txqueuelen 4000
post-up ip link set br0 txqueuelen 4000
Let me know if you need any additional information from my side or need
me to try anything.
