vim /etc/sysconfig/iptables
service iptables restart
# Generated by iptables-save v1.3.5 on Wed Jan 12 14:51:15 2011
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [4818:1515208]
:RH-Firewall-1-INPUT - [0:0]
-A INPUT -s a.b.c.0/255.255.255.0 -j DROP
-A INPUT -s x.y.0.0/255.255.0.0 -j DROP
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