[FW1] how to translate the destination IP using (LINUX IPchains and Mas querading)

["Sim, CT (Chee Tong)" <CheeTong.Sim@FW1-NOSPAMsin.rabobank.com>]

Hi... I just built a LINUX firewall between two network in our company 

Network A:60.100.100.0/24, interface IP in A is 60.100.100.101
Network B:192.168.3.0/24, interface IP in B is 192.168.3.2

>From my workstation (60.100.100.99), I want to connect to a SERVER
(192.168.3.100) in network B using a FAKE address in network A
60.100.100.102.

First I did a proxy ARP to map 192.100.100.102 IP to 60.100.100.101's MAC
address.

So, I want to translate source IP from 60.100.100.0 network to firewall
interface IP in B 192.168.3.2 when it go out from firewall and I can do it
using Ipchains command in Linux "ipchains -A forward -s 60.100.100.0/24 -j
MASQ 
(I don't want to change server's routing table)

But I also need to translate the destination IP from 60.100.100.102 to
192.168.3.100 while it is in Linux firewall.  What is the command to do it
in Linux way??  Can it be done???

Thanks
  






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