NAT implemation

[yogesh at banasdairy.coop]

hi
i have proxy server

eth0=10.1.1.32(local)
eth1=203.199.40.4(global)--for internet


i connect pc to this proxy server implemented by squid whose ip range
10.1.1.1-200.

i want to make NAT for 10.1.1.53(local) from where i can ping
yahoo.com/google.com directly can any one help me


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