FW: DNAT SSH

[Geofrey Rainey]

I think this won't work because I am wanting to allow the world to talk
to 5000 then NAT to 22, while also disallowing the world to talk to 22 
- only the local subnet can talk to 22.

So I want:

subnet only -> :22
world (REJECT) -> :22
world -> :5000
world:5000 -> (NAT) subnet:22

make sense?

Regards,
Geoff.


-----Original Message-----
From: redhat-list-bounces at redhat.com on behalf of nilesh vaghela
Sent: Thu 1/31/2008 8:38 PM
To: General Red Hat Linux discussion list
Subject: Re: FW: DNAT SSH
 
I think the following can work.

> 1. -s anywhere --dport 5000 -j DNAT --to-destination :22

-s subnet --dport 5000 -j DNAT --to-destination 22

This will do nating only only subnet.

Thanx.
>
> FILTER INPUT chain:
>
> 2. -s subnet --dport 22 -j ACCEPT
>
> 3. all others -j REJECT
>
> The problem is the packet arrives on 5000 and is natted to 22 correctly
> (1. - all good so far),
> but because its source IP is not the local subnet (defined in 2.), it is
> rejected in the filter
> INPUT chain (3).
>
> So I'm think something like the following:
>
> a. can the packet bypass the INPUT filter chain?
> b. how can I identify my natted packet within the INPUT filter chain and
> thus ACCEPT it?
>
> Regards,
> Geofrey Rainey.
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Nilesh Vaghela
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