Other two network issues in the installation of Oracle RAC DB

Here, I would like to keep a note for the installation of Oracle RAC DB.

Last month, I failed in the installation for two times. First of all, I got an error about virtual network due to the wrong configuration of Network on VIP address.I can ping the VIPs before installation,this is totally uncorrect configuration.
After disable the specified network card it worked fine.

The second failure is about private network.The first node rebooted unfortunately when I run the script(root.sh) on the second node,the cause is that the message couldn't be sent to second node from first node via private network interface card.You could find the document on this issue from Oracle Metalink, its url link is:

After modified the firewall rules to allow packet for private network to go through(iptables),the error was fixed.

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