In xenserver operation process, will encounter a variety of attacks, brute force server password, etc., how to do some server security, can undertake some simple Settings by iptables,

Note: about iptables table, the table below rules are executed from top to bottom, it means that, you above allows an IP, but below is banned this IP, so this time, prohibit the IP to this rule is invalid,

(a) using iptables table prohibit an IP access,

First take a look at xenserver server's default iptables table, can see, there are some rules inside the
The cat/etc/sysconfig/iptables