Multicast doesn't seem to be working on RHEL 5.5

Posted by NullUser on Server Fault See other posts from Server Fault or by NullUser
Published on 2012-09-04T01:52:22Z Indexed on 2012/09/04 3:39 UTC
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networking

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redhat

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multicast

I'm trying to install Oracle Grid Infrastructure on two machines. Their documentation states

You must enable multicasting for the cluster on the IP address subnet ranges 224.0.0.0/24 and 230.0.1.0/24

So I ran:

route add -net 224.0.0.0/24 dev eth2
route add -net 230.0.1.0/24 dev eth2

route -n produces:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
230.0.1.0       0.0.0.0         255.255.255.0   U     0      0        0 eth2
224.0.0.0       0.0.0.0         255.255.255.0   U     0      0        0 eth2
# and others

An ifconfig eth2 shows, among other things, UP BROADCAST RUNNING MULTICAST.

However, when I run their multicast test utility, it fails me:

Test for Multicast address 230.0.1.0
Sep  3 19:40:39 | Multicast Failed for eth2 using address 230.0.1.0:42000

Test for Multicast address 224.0.0.251
Sep  3 19:41:10 | Multicast Failed for eth2 using address 224.0.0.251:42001

What am I doing wrong?

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