[CentOS] Iptables masq traffic limiting

Indunil Jayasooriya indunil75 at gmail.com
Sat Aug 30 04:08:46 UTC 2008


On Sat, Aug 30, 2008 at 2:56 AM, Joseph L. Casale
<JCasale at activenetwerx.com> wrote:
> Where is the correct place to control what traffic is masq'ed out?
> This is what I have, but I was told the Forward chain isn't the right place to do this?
>
> iptables -A POSTROUTING -t nat -o $WAN -j MASQUERADE
> iptables -A FORWARD -i $WAN -o $LAN -m state --state RELATED,ESTABLISHED -j ACCEPT
> iptables -A FORWARD -i $LAN -o $WAN -m state --state NEW,ESTABLISHED,RELATED -p tcp -m multiport --dports 80,443 -j ACCEPT

> So which table is the theoretically correct place to add all the ports/services
> I would want masq'ed out for internal clients?

Pls try belwo two

iptables -A POSTROUTING -t nat -o $WAN -j MASQUERADE
iptables -A FORWARD -i $LAN -o $WAN -m state --state
NEW,ESTABLISHED,RELATED -p tcp -m multiport --dports 80,443 -j ACCEPT


> Thanks!
> jlc
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-- 
Thank you
Indunil Jayasooriya


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