troubleshooting Question

Can't get VPN Client software to connect to Netscreen 5xp through a Cable modem and Linksys Router together

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I have a Netscreen 5xp at work as a firewall to a 192.168.0.x network.  I have a cable modem at home from Time Warner's Road Runner.

If I just use the cable modem alone I can get the Netscreen remote client software to connect and actually map network drives and use the corporate email. I believe the reason is that the cable modem is acting as a DHCP server and sending out an IP address to my home computer of 65.x.x.x, and the software translates this somehow to my 192.168.0.x network.

But the problem comes in when I try and insert a Linksys Router (WRT54G) inbetween the cable modem and my home computer so that I can use my wireless laptop too.  The Linksys device is also a DHCP server sending out 192.168.0.x IP addresses.

I have tried everything to get the Netscreen Remote Client software to communicate with the 5xp at the office.  But to no avail.  I changed the Linksys to give out 192.168.1.x, that didn't work.  I have PPTP and IPSEC pass through enabled, that didn't work.  I turned off the DHCP service on the Linksys, that didn't work.

Here's what I would like to do.  I would like to have my home computer be on the same 192.168.0.x subnet so that I can browse net shares and see other computers at work through VNC viewer and Microsoft XP's network browser.

I use to have this working with an old Netgear router but I can't seem to get the Linksys to set up the same way.  Can anyone help?  Please.
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