firewall help

[David Cary Hart]

On Sun, 2005-05-29 at 00:13 +0800, freejay wrote:
> Hi, currently our network (2.2.2.x/16) is connected to a gateway router
> (with an IP address of 2.2.2.1) and we do not have any internet connection.
> My boss told me that our network would be connecting to the internet soon,
> so I better build a firewall for this. The firewall we came up with is a 3
> interfaced linux box. One interface is connected to the internet, another to
> our network, and the last one to the gateway router. Here's the problem:
> 1.) the firewall should be transparent enough between the gateway and our
> network that if we need to disconnect from the firewall we could connect
> directly to the gateway router.
> 2.) Our current settings on both gateway and network is retained even if
> connected to the firewall. (e.g. the gateway of our PC's are still 2.2.2.1)
> Hope somebody can help.
> 
That sounds like the perfect setup for shorewall.
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