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[suse-security] SuSEfirewall2 SNAT

Hi :
I have a little trouble, i am trying to build a firewall with Snat command, simply because, i  must to change my ip to 10.1.X.X when i have one, in the net 172.16.1.X


172.16.1.X  ---->   10.1.X.X
172.16.2.X  ----->  10.2.X.X
172.16.3.X  ------> 10.3.X.X

I´ve tryied using SuSEfirewall2, but only works with masq. 

I´ve use the file of custom, and write the next rule, just before masq.

iptables -t nat -A POSTROUTING -s -p tcp -o eth1 -j SNAT --to-source

but isn´t works, somebody knows how to use SNAT in SuSEfirewall2 ?, because if I try building  the rule more general, It filter the packets yet.

Sorry, but my english is not good.