Hy Harish,
 
1. Why NAT and Squid? You should use NAT OR Squid. If you have say a internet cafe where the users will want to use every software that needs every port you should use pure transparent NAT. On the other hand if you want things a little more tightened you should use Squid.
2. On the other hand do you have 3 separate connections to your ISP to create 3 groups? It's a false problem.
Maybe you intended to say something else and I couldn't understand. Be more precise.
 
Good luck

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