routing and dhcp not working

Guys,
>
> I am new to freebsd. I am trying to setup a freebsd firewall and
> ids using snort box.
>
> I want to have it between my cable modem and my linksys wireless
> router.
>
> The pc I am using has two nic cards.
>
> I have one going to my cable modem and one to the wireless router.
>
> The nic card going to my cable modem is set to use dhcp.
>
> The one going to my linksys router has a static ip address.
>
> For some reason using this setup does not work.
>
> I get an routing between the two differnet network segments.
>
> I currently have the gateway feature turned on my freebsd box.
>
> I have the firewall service turned off right now. I want to get
the
> routing to work first.
>
> If I unplug the nic to the linksys card I can get out to the
internet
> from my unix box but not with both nics plugged in.
>
> any ideas I would appreciate the help

What's the output of netstat -ar