GW (LAN1, LAN2, ADSL) config

[Terry Polzin]

On Tue, 2010-04-20 at 15:31 +0200, j.halifax . wrote:
> Hi All,
> 
> please help me kindly to reconfig my default GW (Fedora 12).
> 
> The GW has 3 active Ethernet cards:
> eth0 - connected to Internet ADSL router (incl. VPN, pptpd)
> eth1 - not used
> eth2 - LAN1
> eth3 - LAN2.
> 
> I had everything working fine but due to some problems I lost 
> the configuration of the GW and I can't get it working again.
> 
> (1) The Internet access (LAN1 -> GW -> Internet) is working fine.
> (2) The access of  (Internet -> GW -> LAN1 / LAN2) is ok incl. VPN
> (3) I can not access LAN2 neither from LAN1 nor from GW box
> 
> Traceroute shows that for (3) packets don't go to eth3 (LAN2) as
> they should, but they fall down to eth0 (default gw).
> 
> Can you please advise me what I need to set-up (iptables) in the GW?
> 
> Thank you so much for your kind help.
> 
> Regards,
> jh
> 
Is IP forwarding on?