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Old 08-05-2013, 02:52 PM   #1
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Any way to setup multicast to route out 2 different network interfaces?

I have Linux ES5.5 server that has three network connections. I need to send Multicast output to 2 of those networks. Is this possible? I have the multicast route setup for eth2, but I also need to send multicast out eth1. The service that's sending the the multicast via eth1 knows to explicitly send it using that interface, and I do see that output when running tcpdump, but I wonder if it's actually getting out without the multicast route on that interface.


[root@app-server ~]# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface UGH 0 0 0 eth0 * U 0 0 0 eth0 * U 0 0 0 eth2 * U 0 0 0 eth1 * U 0 0 0 virbr0 * U 0 0 0 eth0 UG 0 0 0 eth1 UG 0 0 0 eth2
default UG 0 0 0 eth0

tcpdump for eth1, searching for specific port and multicast address:

[root@app-server ~]# tcpdump -i eth1 -X -s0 port 1962 | grep ''
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes
11:51:37.260517 IP > UDP, length 5
11:51:38.333829 IP > UDP, length 5
11:51:48.336975 IP > UDP, length 5
11:51:48.578504 IP > UDP, length 5

Last edited by mav1c; 08-05-2013 at 02:53 PM.
Old 08-15-2013, 10:52 PM   #2
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How about bonding the 2 interfaces and sending out bond0 ?


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