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Postrouting and IP Masquerading PDF
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Tuesday, 16 June 2009 04:51

Accepting forwarded packets via the firewall's internal IP device allows LAN nodes to communicate with each other; however they still cannot communicate externally to the Internet.

To allow LAN nodes with private IP addresses to communicate with external public networks, configure the firewall for IP masquerading, which masks requests from LAN nodes with the IP address of the firewall's external device (in this case, eth0): 

[root@myServer ~ ] # iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

This rule uses the NAT packet matching table (-t nat) and specifies the built-in POSTROUTING chain for NAT (-A POSTROUTING) on the firewall's external networking device (-o eth0).

POSTROUTING allows packets to be altered as they are leaving the firewall's external device.

The -j MASQUERADE target is specified to mask the private IP address of a node with the external IP address of the firewall/gateway.

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