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I want to configure a firewall rule, that blocks the traffic from a specific ip address ( to the wan. But only when the RUT955 is connected to the internet trough the interface MOB1S1A1 (SIM Card). 

I tried to make a costom rule. First I tried to block all traffic from But I already failed with that. When I saved the costom rule (Network > Firewall > Costom Rules) all devices no longer have internet access.

iptables -A FORWARD -s -j DROP

This is the only rule I added. After I press reset all devices can connect to the internet again.

Can you help me to find the error? And what do I have to add, that only the traffic trough the interface MOB1S1A1 will be blocked?

Thank you.

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In your case, I would recommend using Traffic rules feature: https://wiki.teltonika-networks.com/view/RUT955_Firewall#Traffic_Rules

Here is an example: