[ILUG] Homework problem for network gurus

[Timothy Murphy]

On Wednesday 16 April 2008 10:53:41 pm Ian wrote:

> Give C a static IP address and block this ip using port 80 on the router

Thanks for your suggestion,
but I'm not sure what you mean.
All the machines have fixed addresses,
or rather one address per LAN.
Eg this laptop I'm using has IP address 192.168.2.19 on the ethernet LAN,
and would have IP address 192.168.3.19 on the WiFi LAN.

I'm not quite clear how blocking this on the ADSL modem
(is that what you mean by the router?) would do any good,
even if I knew how to do it.

> > I have 3 machines, call them A, B and C.
> > A is connected to the internet through an ADSL modem.
> > B is connected to A through ethernet.
> > C connects to B through a PCI WiFi device on B.
> >
> > B can connect to the internet through A.
> > C can connect to A through B,
> > but cannot connect to the internet through A.
> >
> > Is this possible?
> >
> > All machines are running Fedora-8.
> >
> > There is a dhcpd server running on A,
> > serving the ethernet LAN (192.168.2.0).
> > There is also a firewall (shorewall) running on A,
> > allowing packets on the ethernet LAN through to the internet.
> >
> > There is also a dhcpd server running on B,
> > serving the WiFi LAN (192.168.3.0).
> >
> > But the packets on this second LAN cannot get through A to the internet,
> > not surprisingly, probably, as there is no mention of this LAN
> > on the firewall.
> >
> > The usual prize for the first solution that works ...