help port forwarding

[Buklen]

how does the process go when you have to forward through 2 routers?

i have a Linksys WRT54G v.7 router (not a version with the particular problem mentioned in a sticky thread)

and a Siemens speedstream 4200 modem

now i have to port forward through both of these, I think I'm having trouble with the modems forwarding. I have read and followed the Port forward guide to forwarding each of those and it doesn't seem to help.

When Setting port Forwarding in the modem, do i forward the IP address of my computer(192.168.1.100) or the IP address of the router(192.168.1.1)? I have tried either way and it doesn't seem to fix my NAT problem? i can't forward both cause the modem wont let me.

Which do i forward PC's IP? or ROUTERS IP?

[Ultima]

Your PC's IP. Which needs to be set static and outside of the router's DHCP range.

http://www.portforward.com/networking/staticip.htm

[Buklen]

Okay, i have now set my static IP address to 192.168.1.90 and have set DHCP's on both the Router and the Modem to start at 192.168.1.100

but I'm still not getting port forwarding

here's a pic to show how crap my connection is

UPDATE: just plugged straight into the modem, got green lighted, so the router is the problem. or the signal coming from modem to router