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I have a routing problem. I know exactly what I want to do. I know it is possible from looking through older posts of similar problems. But I haven't been able to find the correct solution yet. I have a linux firewall box (Ubuntu 16.04). The box has 4 network interfaces. Our ISP modem is connected to Interface A. What I want to do is setup source routing where for all packets coming in, by default go to interface B - connected to router 1, but for one client's IP ranges I want the packets to go to interface C - connected to router 2.

Any help is appreciated, J

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put on hold as off-topic by Iain, kasperd, Thomas, Ward 2 days ago

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    So what have you done so far, can you give us a network diagram, or can or give us the current network configuration for all your interfaces and routing tables? Right now your question is so vague, I am not really sure what to tell you. The older answers should still more or less work. So if you need help, you likely need to get a lot more specific about what you need, what you have done, and what problems you face. – Zoredache Jan 11 at 20:11