SNAT and DNAT

julien WICQUART j.wicquart at newtech.fr
Tue Apr 26 16:18:20 CEST 2005


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Hi,

i have a special situation.


(INTERNET) ===== 210.210.210.210/eth0|firewall|10.0.0.1/eth1 ===== 10.0.0.2|server|


I want to DNAT a port of my firewall on a server inside:
$IPTABLES -t nat -A PREROUTING -i eth0 -d 210.210.210.210 -p tcp --dport 200 -j DNAT
- --to-destination 10.0.0.2:200

but the server inside only accept packets from the IP of the inside interface of the firewall :
10.0.0.1 so i need that the source IP address of the packet sent by someone(x.x.x.x) on the internet
change in 10.0.0.1.

I try the SNAT, the MASQUERADE:
$IPTABLES -t nat -A POSTROUTING -o eth1 -s x.x.x.x -p tcp --dport 20000 -j SNAT --to 10.0.0.1
or
$IPTABLES -t nat -A POSTROUTING -o eth1 -s x.x.x.x -j MASQUERADE
it don't work.


Anyone know how to make this, DNAT and SNAT simultaneously.

Thanks.

- --

- --
Julien
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