1. 下面我们在测试一下，修改IP是不是会影响SSH等价性（注意，修改private IP，一定是要同步调整GI中记录的inter-connect网络信息的，不然GI是不能正常通信的，oracle有相关文档介绍如何修改Public和Pricate IP的）
2. 从Private IP下手，只要修改node2节点的就可以了
# ifconfig eth2
eth2 Link encap:Ethernet HWaddr 00:0C:29:4D:2D:D0
inet addr:10.0.0.2 Bcast:10.0.0.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:8739422 errors:0 dropped:0 overruns:0 frame:0
TX packets:11094020 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:5201547204 (4.8 GiB) TX bytes:8400210712 (7.8 GiB)
[root@node211g tmp]# more /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 node211g localhost
192.168.1.1 node111g
192.168.1.2 node211g
192.168.1.3 node111g-vip
192.168.1.4 node211g-vip
192.168.1.5 node-cluster-scan
10.0.0.1 node111g-priv
10.0.0.2 node211g-priv <<<<<<<<<<<<<<<<<<<
3. 修改网卡Private IP为10.0.0.12
[root@node211g tmp]# ifconfig eth2 10.0.0.12 netmask 255.255.255.0
4. 查看，已经修改成功
[root@node211g tmp]# ifconfig eth2
eth2 Link encap:Ethernet HWaddr 00:0C:29:4D:2D:D0
inet addr:10.0.0.12 Bcast:10.0.0.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:8744646 errors:0 dropped:0 overruns:0 frame:0
TX packets:11100718 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:5204200949 (4.8 GiB) TX bytes:8404710975 (7.8 GiB)
5. 切换到grid用户测试， 发现在第一次连接的时候，还是要输入密码的，但是第二次就不需要的，说明SSH等价性，在更改IP之后是有影响的，需要在RSA文件中记录新IP登陆的授权信息，但是不用重新配置等价性。
[root@node211g tmp]# su - grid
[grid@node211g ~]$ ssh -p 6001 10.0.0.1
Last login: Mon Dec 22 10:34:07 2014 from node211g-priv
[grid@node111g ~]$ ssh -p 6001 10.0.0.12
The authenticity of host '10.0.0.12 (10.0.0.12)' can't be established.
RSA key fingerprint is 9b:11:59:5b:0f:0d:85:17:94:0c:e0:76:be:c4:7e:9e.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '10.0.0.12' (RSA) to the list of known hosts.
Last login: Thu Dec 18 14:45:30 2014 from dhcp-tokyo-twvpn-1-vpnpool-10-191-12-97.vpn.oracle.com
[grid@node211g ~]$ exit
logout
Connection to 10.0.0.12 closed.
[grid@node111g ~]$ ssh -p 6001 10.0.0.12
Last login: Mon Dec 22 10:34:55 2014 from node111g-priv
到此，本次测试结束，分别测试了在SSH端口变更情况下，对RAC的影响。还有修改IP对于SSH等价性的影响。
------------测试，才有说服力！！！------------