How to forward / regenerate a ip packet between two network interfaces

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Java

network

I want to write a small gateway server where it has three network interface cards (say A,B,C)latched on to three different network segments. This server will act as the gateway server. I want to do the following;

1. to read the Ethernet frame headers and the IP packet headers of the datagrams / packets forwarded to network interface card "A"

2. to forward / regenerate the same packet in chosen interface card (i.e. either B or C) when the packets meet certain parameters required by the respective interfaces B or C.

I want to implement this on Windows platform, so please guide me on how to achieve the above two things using Java raw sockets (or any other).

Thank you very much well in advance for your help and time...i really appreciate it.

Cheers

What I have tried:

I tried to implement this using Raw Socket programing...but couldn't find proper way