Palo Alto Azure - second trust interface routing issue?

Samebeef — Fri, 08 May 2020 10:00:56 GMT

I am doing a lab in Azure with a VM-300. I have the three interfaces - trust, management, and untrust. I have this model working to protect 2 additional subnets that have VMs, I achieved east-west and north south protection, including microsegmentation. However, I was wondering if I can add a new interface to control security policies by zones (currently I will ahve to specify the sunet address). I added a NIC on a new subnet and after reboot the PA has a third interface (trust2), and with other subnet that have VMs in in and emulated what I did with the trust interface.

Problem is that I am seeing traffic going through the firewall, but is not returning back (no reply).. I think it might be a routing issue in Azure UDR however they seem fine to me.. See below for my Azure UDRs and PAN VR. Can someone tell me if they have achieved this configuration and possiblity where my issue is? Let me know if you need a network diagram, iI can do one

and add it. From below, I am trying RDP connection from LAN2 to LAN3 subnet:

10.1.2.4 - trust interface ip on Palo Alto VM

10.1.6.4 - trust2 interface ip on Palo Alto VM

Re: Palo Alto Azure - second trust interface routing issue?

Retired Member — Thu, 28 May 2020 16:16:32 GMT

I'm not sure where you are testing from but if you are initiating your test from the Internet to access the servers on trust2, did you create a NAT statement on the Palo Alto for the traffic to allow it to be routed over the Internet?

Otherwise, also confirm the subnet mask you put on the Trust2 interface. Make sure you used a /24 (or whatever the mask is for the entire subnet) as opposed to just the /32. If you use the /32 the firewall won't know how to get to that subnet.

topic Re: Palo Alto Azure - second trust interface routing issue? in VM-Series in the Public Cloud

Palo Alto Azure - second trust interface routing issue?

Re: Palo Alto Azure - second trust interface routing issue?