topic Deny internet traffic for a specific subnet in General Topics

Deny internet traffic for a specific subnet

FWTECNOFORM — Wed, 17 Apr 2019 14:58:45 GMT

Hello, is it possible with palo alto firewall to deny internet traffic for a specific subnet?

let's say I have this subnet: 10.100.30.0/24

I want 10.100.30.0/24 to not reach the internet.

What should I do?

OtakarKlier — Wed, 17 Apr 2019 15:15:07 GMT

Hello,

Just make sure to put in a deny policy prior to your allow internet policy.

The PAN just like every other FW reads top down left to right for policies, once it matches the action in the policy is taken, e.g. allow or deny.

i.e.

'deny internet for subnet' source IP 10.100.30.0/24 destination zone untrust action deny

'allow internet' source zone trust destination zone untrust action allow

That is highly simplified and follow best practices on URL and threat filtering including ssl decryption.

Hope that helps.

Remo — Wed, 17 Apr 2019 15:18:17 GMT