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Who rated this post

TomYoung
Cyber Elite

‎08-31-2023 05:49 AM

Hi @nw-rogox ,

 

I would configure active/passive HA.  It is less complex than active/active.

 

  1. You can create 2 VLANs on your existing switches - one for each ISP.  (As long as you do not create a L3 IP address for the VLANs, the switches will not be accessible from the Internet.)
  2. Then you can connect each ISP to both NGFWs and use active/passive HA.
  3. Enable ECMP with Symmetric Return.
  4. Configure 2 default routes.
  5. Configure NAT normally for each ISP.
  6. You can tune the ECMP hashing if you have weird issues.  https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-admin/networking/ecmp/ecmp-load-balancing-algori...

Thanks,

 

Tom

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