Network off a network, but not a subnet mask

[Andrew Hodgson]

Hi,

>I have a networking problem that I have not managed to resolve.

>My Virgin Media cable modem connects to an ethernet card (red) of a 
>Smoothwall Firewall.  It is therefore a router.  The second ethernet 
>(green) card connects to a switch off of which is a PC (Dell dual boot 
>mandriva/XP), a HP printer and a second (wireless) router.  That second

>router connects wirelessly to a laptop (Kubuntu).  There is reason for 
>this complicated set up.

>The IP range for the Soothwall network is 192.168.1.x.  The PC is
static 
>on 192.168.1.2, the printer is on 192.168.1.198 and the router connects

>to this network on 192.168.1.175.  The range for the router is 
>192.168.2.x and the laptop connects wirelessly on 192.168.2.4.

>The printer is accessible from the laptop and I can print OK.

>When the Dell is booted into XP I want to be able to do two things
>1) see the XP file system from the Kubuntu laptop.
>2) from the kunbuntu laptop use VNC to remotely control the XP computer
>But I have no idea how to achieve this.

Since you are going from within the second router to the outside (from
the router's perspective), it should just be a case of configuring the
XP machine to allow the relevant ports on the firewall, or disable the
XP firewall completely.  You would then from the laptop use the
192.168.1.x IP address of the XP machine.

It gets complex when you want to access a machine on the 192.168.2.x
network from the XP machine, as the router is doing NAT.

Thanks.
Andrew.