https://sourceforge.net/p/e1000/mailman/message/28162876/
Dear Sirs:
We are using a linux bridge with two intel 10gb cards(82599) to
connect two routers. These two routers are running OSPF protocol.
Currently the problem is:
1) Using IPv4, all is correct.
2) Using IPv6, two routers can ping each other, but the ospf protocol
packets are dropped by linux bridge.
With tcpdump, we find that:
1) All IPv4 packets are forwarded by linux bridge.
2) For IPv6, unicast packts are forwarded, ICMPv6 neighbor discovery
packets (destined to 33:33:00:00:00:02) are also forwarded, but OSPFv3
protocol packets (destined to 33:33:00:00:00:05) cannot be forwarded.
The linux bridge has disabled IPv6. Since bridge will forward any
packets, we assume that possible ixgbe discard the multicast packets? It
is really very weird, will you give me some suggestions? Thank you!
Best regards
Qianli Zhang
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Do the HW statistics show the driver dropping the packets? You can use ethtool to view the HW Ethernet stats of the ixgbe device. Please do so but I'm guessing that it's not the HW (or driver) dropping the packets. It's the stack. You can also use 'netstat -s' to see the stack statistics which may also show what's going on. Cheers, John