[Bridge] Bridge not functional after disconnect / connect

[Alex Shnitman <alexta69@yahoo.com>]

Hi,

I have two NICs on my machine, one connected to a router and is always up, and the other connected back-to-back to a laptop, and this one I disconnect and connect all the time. I created a bridge on top of these two interfaces, and it functions fine, except when I disconnect and connect the laptop, I have to remove it from the bridge and add it back before it starts bridging! In other words, I need to do "brctl delif br0 eth0; brctl addif br0 eth0".

The output of "brctl showmacs br0" and "brctl showstp br0" looks the same and perfectly correct before the removal/adding and after it. From playing around with Wireshark it seems to me that before delif/addif only broadcasts are received from the laptop; unicast packets do not appear there. I got all zeros in /proc/sys/net/bridge/*. It looks like everything is configured correctly.

Any idea at all why I see this behavior? Any tips as to how I might debug it?

The kernel I'm running is 2.6.18 from Debian Etch.

Please, if any more information is required, let me know. I don't want to spam the list with long dumps of everything if it's not needed.

Thanks in advance,
--Alex





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