Re: iptables and NAT

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On Wednesday 26 January 2011 04:44 AM, Jorge Fábregas wrote:
> On 01/25/2011 01:13 PM, Jatin K wrote:
>> iptables -t nat -A PREROUTING -d xx.xx.xx.xx -t tpc --dport 80 -j DNAT
>> --to-destination 192.168.131.131
> Ok, assuming your default policy is to drop, I think you'll need this rule:
>
> iptables -A FORWARD -i eth1 -m state --state ESTABLISHED,RELATED -j ACCEPT
>
> I'm assuming eth1 is your internal interface (and eth0 your external WAN
> iface).  This rule will allow the responses from your web-server to
> pass-thru your firewal...
>
> Also, if you leave all like this it won't work as you need to perform
> "Source NAT or Masquerade" for your 192.168.131.131 ip (if you
> don't...then it will leave your external interface as coming from
> 192.168.131.131 which of course is not valid ip for the internet).  In
> order for your webserver send responses to a machine on the internet you
> need to masquerade its ip. You can do this with this:
>
> iptables -A POSTROUTING -o eth0 -s 192.168.131.0/24 -j MASQUERADE

I've not tried this ....  thanx for suggestion

I will try it and let the list know
> That is, all traffic that will go out thru eth0, if the source network
> is 192.168.131.0/24, then change the source ip to that of your eth0
> (your WAN ip).
>
> Try that and see if works.
>
> HTH,
> Jorge


-- 
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   ^ ^  Jatin Khatri
Registerd Linux user No #501175
www.counter.li.org
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