Sorry I have found my answer, I just had to reread the docs carefully

eth1:!192.168.0.0/24 eth0

is all I need.

Regards
Rabie

> Hi,
>
> Wonder if this is possible, on some comercial firewalls (pix/checkpoint)
> you can masq (hide NAT) all outgoing traffic but then you can do
> exclutions
> based on a certain source/destinations combo:
>
> ie what I want is : (eth1 = dsl eth0 = internal)
> eth1:192.168.10.0/24 eth0!192.168.0.0/24
> eth1 eth0
> however it dies with a error:
> iptables v1.3.5: Unknown arg `--sport'
> Try `iptables -h' or 'iptables --help' for more information.
>    ERROR: Command "/sbin/iptables -t nat -A ppp0_masq -s 192.168.10.0/24
> -d 192.168.0.0/24 --sport 53 -m policy --pol none --dir out -j" Failed
>
>
> So what that will give me is if the internal network 192.168.0.0/24 goes
> to 192.168.10.0/24 masq will not happen, however if it goes anywhere else
> on the internet masq will happen.
>
> What I used to do on checkpoint was setup hide nat but then in the
> translation table I set a
> 192.168.0.0/24 192.168.10.0/24 original original
>
> I am currently running shorewall ver 3.2.4
>
> Any help would be appreciated.
>
> Regards
> Rabie
>
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