[SWLUG] Network off a network but not a subnet

[Neil Greenwood]

On Tue, Apr 1, 2008 at 11:25 PM, Stephen Constantinou
<stephanos at writeme.com> wrote:
> Dear All
>
>  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 subnet mask is 255.255.255.0), 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 subnet mask is 255.255.255.0)
>
>  The printer is accessible from the laptop and I can print OK.  I can
>  connect to the Internet from the laptop as well.
>
>  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.
>
>  I disabled the firewall (Kaspersky) on the XP machine and tried again.
>  Unfortunately I still could not connect to the XP machine from the
>  laptop.  From the laptop I tried to ping 192.168.1.175, 192.168.1.1,
>  192.168.1.2. but the host is always unreachable.  I canot find a
>  firewall on the Kubuntu laptop.

If you can't ping the printer, it's unlikely to be the firewall on the
Dell machine. It's probably that the wireless router is not forwarding
the packets to the 192.168.1.x subnet from the Kubuntu laptop. I'd
start by looking at the configuration of that router. IIRC you need to
set it up as a bridge.

>  The XP file system allows sharing and when I put the laptop on the first
>  network, the Smoothwall network, I can ping the XP machine, make a VNC
>  connection to the XP machine from the laptop, and see and write to the
>  XP file system.

This seems to confirm that it's the wireless router that's mis-configured.

Hwyl,
Neil.