How to configure a gateway firewall using iptables in Centos 6.3

System environment: centos6.3 x64

IPTABLES: System with Self

I. Deployment environment:

1. Close SELinux

# Setenforce 0

# Vi/etc/sysconfig/selinux

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Selinux=disabled

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2. Empty the default policy and restart Iptables

# iptables-t Nat-f

# iptables-f

# Service Iptables Save

# Service Iptables Restart

3. Turn on server-side routing forwarding function

# vi/etc/sysctl.conf

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Net.ipv4.ip_forward = 1

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# sysctl-p

In this example we simulate a Web site, only open the ssh:22 and web:80 ports at the firewall, and configure the firewall to the intranet server 22 and 80 port mapping, if you open other port services, please modify

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