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ahmed meraj avatar Server

iptable rules for ACL rules between routers

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ahmed meraj

Assuming by default everything is allowed between routers. I would like to add iptable rules in "Router1" to implement ACL rules as shown in the diagram.

  • In the below image, client1 and client2 CAN establish a connection to client3 and client4.

  • client3 and client4 CANNOT establish a connection to client1 and client3.

enter image description here

In a similar way, I want to add rules in Router1, where:

  • client1 and client2 CAN establish a connection to client3 and client4
  • client1 and client2 CANNOT establish connection to client5.
  • client3 and client4 CANNOT establish connection to client1, client2, and client5.
  • client5 CAN establish connection to client1, client2, client3 and client4

enter image description here

I was trying to use this iptable rule but didnt succeed.

  • iptables -A FORWARD -s {router_network} -m conntrack --ctstate ESTABLISHED,RELATED -j DROP

Any help in letting me know what rules I need to add in Router1 to make this work will be greatly appreciated.

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