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安装Oracle 11.2.0.4 的RAC，在Grid 安装时报错：
[INS-41112]Specified network interface doesnt maintain connectivity across cluster nodes
首先尝试在节点间ping 各个IP 地址没有问题。
因为使用安装程序做的SSH 验证，所以尝试测试ssh远程连接是否还需要确认：
[grid@vdb1 ~]$ ssh vdb1 date # 验证vdb1 ssh
Thu Aug :: CST
[grid@vdb1 ~]$ ssh vdb2 date # 验证vdb2 ssh
Thu Aug :: CST
[grid@vdb1 ~]$ ssh vdb1-priv date # 验证 vdb1-priv ssh
The authenticity of host 'vdb1-priv (172.168.1.18)' can't be established.
RSA key fingerprint is ::::7b:fe:b0::5a:9b:ec:b5:3f:d1::8f.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'vdb1-priv,172.168.1.18' (RSA) to the list of known hosts.
Thu Aug :: CST
[grid@vdb1 ~]$ ssh vdb2-priv date # 验证 vdb2-priv ssh
The authenticity of host 'vdb2-priv (172.168.1.19)' can't be established.
RSA key fingerprint is ::::7b:fe:b0::5a:9b:ec:b5:3f:d1::8f.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'vdb2-priv,172.168.1.19' (RSA) to the list of known hosts.
Thu Aug :: CST
发现使用vdb1-priv和vdb2-priv时需要确认，在2个节点间互相确认后，该步骤任然未通过验证。
检查发现是没有关闭防火墙 ，关闭两个节点的防火墙后，该问题解决。