Fwd: Interfaces connected by bridge(4) do not pass arp replies

[Kim Culhan]

On Wed, Oct 31, 2012 at 8:37 AM, Gleb Smirnoff <glebius at freebsd.org> wrote:
> On Wed, Oct 31, 2012 at 08:28:48AM -0400, Kim Culhan wrote:
> K> Thanks for that, so far the working revision has been found in r240826.
> K>
> K> Would anyone have a suggestion for a revision to try next ?
>
> Middle between r240826 and revision that didn't work for you. :)
>
> --
> Totus tuus, Glebius.

Searching for the revision which did not work, I started with a test
machine at a revision which was working and
tested several builds until the latest at the time: r242429, where it
is still working.

The 'non-working' machine was also updated to r242429 and it is still
not working.

For this update, the existing /usr/src tree was removed and a new tree
checked-out, /usr/obj was removed before
building.

The working machine had 2 identical em interfaces, so removed one and
installed it into the non-working machine
replacing an re interface there.

The em interface on the working machine looks like:

em0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric
0 mtu 1500
        options=4009b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,VLAN_HWTSO>
        ether 00:15:17:93:95:c9
        inet6 fe80::215:17ff:fe93:95c9%em0 prefixlen 64 scopeid 0x1
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active

The identical type em interface on the non-working machine looks like:

em0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric
0 mtu 1500
        options=40098<VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,VLAN_HWTSO>
        ether 00:15:17:98:5f:e6
        inet6 fe80::215:17ff:fe98:5fe6%em0 prefixlen 64 scopeid 0x2
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active

Note the options on the cards are now different, how can I [re]enable
RXCSUM,TXCSUM on the card
which was moved?

Any thoughts on what could be going on would be greatly appreciated.

thanks
-kim