Can you help me configure my Linksys Broadband Router and WatchGuard firewall?

I have a Linksys BEFW11S4 wireless router behind a WatchGuard gateway router and use static addressing for our...

network. I would like to create a different subnetwork behind the wireless router, which still has access to the Internet and to some of the machines behind the gateway router. Can you help me? Thank you. You should be able to configure your Linksys Broadband Router and WatchGuard firewall like this (for example):


Here, the Linksys BEFW11S4 is configured with static WAN IP address (default gateway and static LAN IP address The WGRD's inside (trusted) subnet is, and both ServerA and the BEFW11S4 are part of that subnet. The BEFW11S4's LAN subnet is, and ClientB is part of that subnet.

When ClientB sends outbound traffic through its default gateway (, the BEFW11S4 applies Network/Port Address Translation, changing the packet's source IP address to and forwarding the packet towards its destination. If the packet's destination is on the public Internet, the packet will be relayed through the default gateway ( If the packet's destination is ServerA, the packet will be forwarded directly over the trusted LAN to

A response coming from the Internet will be forwarded by the WGRD to, where the BEFW11S4 will NAT it back to (ClientB). A response coming from ServerB will be sent directly over the trusted LAN to and be NAT'ed back to ClientB.

You do not need any extra static routes because the BEFW11S4 is operating in NAT mode and thus appears to the WGRD and ServerB like another host on the same trusted LAN. You do not need to create any static NAT bindings on the BEFW11S4 as long as you only want to allow outbound traffic from wireless clients to wired servers or the public Internet. If you wanted to enable inbound (unsolicited, non-response) traffic from ServerA to ClientB, then you would need to configure 1-1 NAT bindings on the BEFW11S4.

This was first published in December 2003

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