Re: home network behind a firewall/router

[Raj Kiran Grandhi <grajkiran@gmail.com>]

Pál Csányi wrote:
> Hello!
>
> I have a Cable Modem connection to my ISP.
>
>              my ISP
>                |
> Cable Modem connection to my ISP
>                |
>     PC box-1 firewall/gateway
>     =========================
>     |                       |
>    LAN                     DMZ
>     |                       |
> PC box-2                PC box-3
> desktop                 server
> Debian Etch             Debian Etch
>
> I can connect from the PC box-1 to the internet,
> but can't connect from LAN & from DMZ to the internet.
>
> I use shorewall on all boxes, but even when I do
> shorewall clear on all boxes, I still can't to connect to the
> internet from LAN & DMZ.
>
> On the firewall/gateway I have dhcp server which give
> IP addresses to box-2 & box-3.
>
> I set up on both box-2 & box-3 the dhcp client to get the
> domain-name-servers, and have these servers in resolv.conf.
>
> What is missing here to get the connection to the internet
> from LAN & DMZ?
>
> Any advices will be appreciated!

You did enable IP masquerading on your gateway machine, didn't you?

Also output of "iptaples --list" on your gateway and "route" on your lan 
clients would help.

--
Raj Kiran Grandhi