[ILUG] Homework problem for network gurus

[A. Dreyer (ILUG)]

Timothy Murphy wrote:
> 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 ...

Hi Timothy,

Missing pieces:

* How is the firewall configured ?
* What do your NAT rules look like ?
* What is in the routing tables on A and B ?


/me polishes my old crystal ball...

First guess: You have not NAT rule for the WiFi network..



Cheers,
Achim