I have upgraded a server from RH4 -> RH5.5 and we have an interesting issue with multicast.
- we have multiple NICS on the server, we want the bond0 to default as the default interface.
- adding route 224.0.0.0/4 dev bond0 doesn't seem to work.
- removing multicast from the other interfaces via ifconfig -multicast does not work either.
- as you can see below, eth0 seems to be the default interface.
- everything works fine if I down the interfaces in front of bond0 first.
$ ip route
146.149.87.248/29 dev eth0 proto kernel scope link src 146.149.87.253
146.149.87.216/29 dev eth5 proto kernel scope link src 146.149.87.221
169.113.218.0/23 dev bond1 proto kernel scope link src 169.113.218.62
169.113.216.0/23 dev bond0 proto kernel scope link src 169.113.217.60
10.11.184.0/21 dev eth6 proto kernel scope link src 10.11.184.96
169.254.0.0/16 dev eth6 scope link
**224.0.0.0/4 dev bond0 scope link**
default via 169.113.216.1 dev bond0
$ netstat -g
IPv6/IPv4 Group Memberships
Interface RefCnt Group
--------------- ------ ---------------------
lo 1 ALL-SYSTEMS.MCAST.NET
eth0 1 224.9.10.11
eth0 1 224.10.10.21
**eth0 1 ALL-SYSTEMS.MCAST.NET**
eth5 1 ALL-SYSTEMS.MCAST.NET
eth6 1 ALL-SYSTEMS.MCAST.NET
bond0 1 ALL-SYSTEMS.MCAST.NET
bond1 1 ALL-SYSTEMS.MCAST.NET
$ tcpdump -i eth0
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
00:18:58.093483 IP 146.149.87.253.60830 > 239.255.64.101.22355: UDP, length 24
00:18:58.231905 IP 146.149.87.249 > PIM-ROUTERS.MCAST.NET: PIMv2, Hello, length: 34
00:18:58.492444 IP 146.149.87.253.60830 > 239.255.64.101.22355: UDP, length 24
00:18:58.851423 IP 146.149.87.253.43237 > 224.9.10.11.bullant-rap: UDP, length 24
00:18:58.891409 IP 146.149.87.253.60830 > 239.255.64.101.22355: UDP, length 24
00:18:58.902533 IP 146.149.87.253.60830 > 239.255.64.101.22355: UDP, length 161
00:18:59.040125 802.1d unknown version
00:18:59.291385 IP 146.149.87.253.60830 > 239.255.64.101.22355: UDP, length 24
00:18:59.690362 IP 146.149.87.253.60830 > 239.255.64.101.22355: UDP, length 24
00:18:59.851356 IP 146.149.87.253.43237 > 224.9.10.11.bullant-rap: UDP, length 24
00:18:59.851716 IP 146.149.87.253.43237 > 224.9.10.11.bullant-rap: UDP, length 45
00:18:59.904441 IP 146.149.87.253.60830 > 239.255.64.101.22355: UDP, length 161
00:19:00.105330 IP 146.149.87.253.60830 > 239.255.64.101.22355: UDP, length 24
00:19:00.221321 IP 146.149.87.253 > 224.9.10.11: igmp v2 report 224.9.10.11
00:19:00.504310 IP 146.149.87.253.60830 > 239.255.64.101.22355: UDP, length 24
