I am using a Cisco PIX Version 6.3(5) firewall and I have only one static IP. My supporters tell me that it takes two static IPs to do port forwarding in a firewall. Is it true that I require two static IPs? Please explain, if this is so.
Port forwarding is the act of forwarding a network port from one network node to another. This technique can allow an external user to reach a port on a private IP address (inside a LAN) from the outside via a NAT-enabled router.
Routers are configured with two interfaces: One is your WAN interface that connects to the Internet and is configured with a Public IP address (xxx.xxx.xxx.xxx) provided by your ISP. The second is an internal (LAN) network interface which is configured with your local internal (LAN) static IP address (192.xxx.xxx.xxx).
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