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oracle rac的网卡必须要支持多播，私有网卡不支持多播RAC搭建会有问题。
如果ifconfig命令看到MULTICAST关键字，基本可以确定该网卡是支持多播的
但是在极端情况下可能并不准确，这个时候就需要用到工具mcasttest.pl
在MOS:1212703.1中提供了检查多播的工具mcasttest.pl
加压好后运行命令就可以检查网卡是否支持多播
perl mcasttest.pl -n node1,node2 -i en0,en2
node1:节点名
en0：网卡名，有时会是eth0等
测试如下：
$ perl mcasttest.pl -n ntracd01,ntracd02 -i en0,en2
########### Setup for node ntracd01 ##########
Checking node access 'ntracd01'
Checking node login 'ntracd01'
Checking/Creating Directory /tmp/mcasttest for binary on node 'ntracd01'
Distributing mcast2 binary to node 'ntracd01'
########### Setup for node ntracd02 ##########
Checking node access 'ntracd02'
Checking node login 'ntracd02'
Checking/Creating Directory /tmp/mcasttest for binary on node 'ntracd02'
Distributing mcast2 binary to node 'ntracd02'
########### testing Multicast on all nodes ##########
Test for Multicast address 230.0.1.0
Sep 27 16:47:35 | Multicast Succeeded for en0 using address 230.0.1.0:42000
Sep 27 16:47:37 | Multicast Succeeded for en2 using address 230.0.1.0:42001
Test for Multicast address 224.0.0.251
Sep 27 16:47:38 | Multicast Succeeded for en0 using address 224.0.0.251:42002
Sep 27 16:47:39 | Multicast Succeeded for en2 using address 224.0.0.251:42003