Re: Fwd: Linux bridge on linksys WRT54GS running OpenWRT

Op vr, 18-11-2005 te 20:37 +0100, schreef Sebastien Chaumontet:
> Hi Bart,
> 
> Thanks for your attention to this subject.
> 
> Here is how to reproduce this problem:
> - two hosts on a LAN
> - on host A create a bridge
> - add the device to bridge
> - run on host A : "tcpdump -i br0 not ip"
> - run on host A : "tcpdump -i eth0 not ip"
> - on host you can use a very good tool like vlc to join a group :
> "vlc udp://@[ff1e::8888]:8888"
> 
> This should generate a MLD report (which should be catched by
> multicast router) but it is blocked by something in bridge.
> So you will be able to see it on eth0 and not br0.
> 
> If you need some more information we can discuss about this on IRC
> #etables (freenode).

Using the pcap file you sent me, it turns out that the version field in
the IPv6 header isn't filled in correctly. Your packet has value 0
there, while it should be value 6.

Removing the following two lines from
net/bridge/br_netfilter.c::br_nf_pre_routing_ipv6() should let those
packets through (please report back if that doesn't fix it):
if (hdr->version != 6)
	goto inhdr_error;

Alternatively, you can disable IPv6 filtering by the bridge by doing
# echo 0 > /proc/sys/net/bridge/bridge-nf-call-ip6tables

cheers,
Bart




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