topic Re: DIP NAT on inter vsys traffic in General Topics

DIP NAT on inter vsys traffic

yhlee1 — Tue, 03 May 2022 08:58:33 GMT

Hello,

I have a FW that has many nat rules.

And I found a bug, pan-130550:

(PA-3200 Series, PA-5220, PA-5250, PA-5260, and PA-7000 Series firewalls) For traffic between virtual systems (inter-vsys traffic), the firewall cannot perform source NAT using dynamic IP (DIP) address translation.

Workaround: Use source NAT with Dynamic IP and Port (DIPP) translation on inter-vsys traffic.

Mine is PA-5250 and I already have DIP NAT rules for inter vsys traffic, and it looks like working well(hit counts, log..)

Anyone knows about that bug? Does it impact on every traffic or sometimes FW cannot perform NAT?

The workaround of the bug not works for me, I can't convert every DIP NAT rule to DIPP in my FW...

Re: DIP NAT on inter vsys traffic

BPry — Tue, 03 May 2022 20:27:53 GMT

@yhlee1,

This bug ID has been carried through PAN-OS since the hardware platforms were released with the newer FPGAs. If you aren't running into an issue on your current release, I wouldn't be overly worried about it moving forward.

Re: DIP NAT on inter vsys traffic

yhlee1 — Wed, 04 May 2022 01:30:56 GMT

Thanks for the answer.

Sorry I didn't mention my current version, it's 8.1 and FW is PA-5250..

And I found some weird log, which is "session end reason is unknown."

Guess that hit the bug, and it looks like not every traffic but some traffics definitely are affected.