NAT/MASQ on eth0 - doubt

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Hello,
     My server is on Mandriva 10.1
eth0 is WAN with static IP connected to 512K DSL
eth1 is LAN - 192.168.0.0/24 and 192.168.21.0/24

I have used webmin and done :

Do network address translation on external interface:eth0

This gives the following entries in iptables :

# Generated by iptables-save v1.2.9 on Tue Apr 26 14:50:01 2005
*nat
:OUTPUT ACCEPT [0:0]
:PREROUTING ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
-A POSTROUTING -o eth0 -j MASQUERADE


So should I just masq all out ?

Is it possible to use my static IP or 
subnets details to rewrite the above 
masq rule while I am doing a NAT on eth0 ?

If yes how ?

Thanks

Varun



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