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I have a linux computer A running RHEL-8.10 that has internet access, on it's eth3 port; it has a quad port nic whose ports shows up as eth<0,1,2, and 3>.

If I use a second RHEL-8.10 computer B, and connect its eth0 port to computer A's eth2 port, is it possible to allow computer B to see the internet via computer A's eth3 port ? If so can someone post the instructions and terminology on what/how to configure computer A to allow this to happen?

Thus far:

  • I have set A's eth2 port to static 192.168.1.1.
  • And B's eth0 port to 192.168.1.2.
  • I have connection between A and B and can do scp between the two... given default public firewalld settings of allowing tcp/22 for SSH.
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This is exactly what every router does, and most routers use Linux under the hood. So in terms of terminology, you are looking for the steps to configure your machine A as a router. Another relevant term is IP forwarding and NAT.

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  • so on computer A I set up IP forwarding between its eth2 and eth3 port? Commented Mar 18 at 19:13

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