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[PLUG] connecting a router's wan port to a firewall?
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I'm trying to set up a firewall between my cable modem and wireless
router. I have no problem connecting the firewall to the router's lan
ports, but I can't make things work on the router's wan port.
The firewall is a Linux machine configured with ip forwarding. That
works fine. There are two nics on the firewall: eth0 is connected to the
cable modem, configured dhcp. eth1, 192.168.1.1, is connected to the wan
port of a linksys wireless router. dhcp is running on eth1. It assigns
the router a wan ip 192.168.1.100-200, gateway 192.168.1.1, netmask
255.255.255.0, dns Comcast's numbers. The router's lan address is
192.168.1.2, which it assigns to its clients as a gateway.
Like I said, if I use the lan ports only, the setup works fine-- I guess
because that's just a switch and there is no routing involved. I could
be satisfied with this, but it seems like the 'right' way to do it would
be to make use of that wan port to the firewall.
What am I not understanding?
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