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Hello I would like to ask you a question about the settings to be made on the RUT240 firewall: - Only IP A must be able to access the X.Y.Z.W server - IP B must be able to access IP D - the IPs on the WAN (D and E) must not access the Mobile and the LAN - IPs C and B must be able to talk to each other and ONLY with the RUT240 - the X.Y.Z.W Server must be able to access IP A in port-Forwarding - only IP A must be able to communicate with IPs D and E Thanks

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For your use case, I would recommend using iptables. You can insert custom iptables rules by navigating Network > Firewall > Custom rules.

There is a comprehensive guide about rules which should help you to come up with the required rules: https://www.howtogeek.com/177621/the-beginners-guide-to-iptables-the-linux-firewall/