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Deny Access to Uplink Interface Network

Hello,

first sorry for my english.

My sg utm 230 has actually 3 Interfaces.

ETH0 Internal Network: 172.16.30.0/24
ETH1 Internet with static IP
ETH2 Internet: 172.16.31.254/24 with Default Gateway 172.16.31.1/24

I created a masquerading rule:
Network: 172.16.30.0/24 -> Uplink Interfaces

I created this firewall rules:
Network: 172.16.30.0/24 -> WebSurfing -> Internet IPv4
ACTION: Allow

After this, clients in network 172.16.30.0/24 has access to any server in network 172.16.31.0/24.
I don't like this. I try to deny access with a firewall rule on top:
Network: 172.16.30.0/24 -> any -> Network: 172.16.31.0/24
ACTION: DROP

But it doesn't works...
What is wrong on my Configuration?

Thank you for help.



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