How can I route network traffic such that the packets go out via the same interface they came in?

Solution Verified - Updated -

Issue

  • How can I forward network packets to the same network interface from where it came from?
  • Two interfaces are both connected to internet which is provided by different ISPs. How can I make the network packets go back via the interface where they came from?
  • How to assign two IP for two NIC with two diffrent subnet (two different gateway). How to add two gateway on a single machine.

Environment

  • Red Hat Enterprise Linux
  • System connected to Internet via multiple network interfaces on different networks/ISPs
  • System connected to the same subnet via multiple network interfaces

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