setup & how to reproduce:
HP Netserver 2000 with 2 onboard e100 NICs. Both are connected to the same hub.
Add both eth0 and eth1 to the same bridge. Pull the plug on eth0. Wait till the bridge is about to enter forwarding state on eth1.
I have reproduced this with earlier kernels (2.4.20+) too but they were heavily patched. This is a pristine 2.4.22.
Strange but true: This works when using eepro100 insted of e100.
It turned out that the IP receive checksumming on the board (which the e100 driver enables) triggered a bug in the bridging code.
The following patch by Stephen Hemminger fixed it:
diff -Nru a/net/bridge/br_forward.c b/net/bridge/br_forward.c --- a/net/bridge/br_forward.c Fri Sep 5 11:28:33 2003 +++ b/net/bridge/br_forward.c Fri Sep 5 11:28:33 2003 @@ -59,6 +59,7 @@
indev = skb->dev; skb->dev = to->dev; + skb->ip_summed = CHECKSUM_NONE;
NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, indev, skb->dev, __br_forward_finish);
Thank you for solving my problem!
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