Firewall/NAT

Hi, bit of a complex setup here...

I have a m0n0wall firewall on soekris, as 192.168.0.1, then a linksys gateway as 192.168.0.2 (192.168.1.1 from the LAN side).  On that network I have a linux box which listens for SSH (port 22).

On the m0n0wall I've added a firewall rule to allow port 22 from anywhere, and I've added a NAT rule to pass port 22 to the linksys box (192.168.0.2).

THen on the linksys box, I've told it to pass port 22 to the IP of my linux box.

The m0n0wall firewall log says it's passed the connection through, but it just times out.  The linksys port forwarding has been very simple and reliable in the past, so I don't expect the issue lies there, and I can ssh to the linux box from other internal machines so I know it's listening.

Any ideas on debugging this?  My understanding is m0n0wall isn't linux based, so I can't get terminal on it to try telnetting to the linksys:22. 

Thanks!