topic Re: Two separate PA one the same ISP on both location in General Topics

Two separate PA one the same ISP on both location

stefan.tomasevic — Tue, 11 Feb 2025 12:57:40 GMT

Hi,

we have two PA fws around 1km in bettwen.

They are connected with dark fiber so users on both side can see each other.
One the same ISP on both side, and public IP address range of /28 addresses.

We are using that public IP address for several services (each service has its own public IP) and want to configure both PA so when PA on primary location goes down, PA on seconday location via dark fiber, take over that traffic so all services that are published over Primary PA, is now published via DR PA.
What do I need for that?

additionaly, we have MikroTik ISP router in front of each PA. Thay are next hop for default routing.

Re: Two separate PA one the same ISP on both location

Raido_Rattameister — Tue, 11 Feb 2025 13:14:19 GMT

You have different /28 at both sides?

With active/passive setup interface config is identical so both firewalls need to have same public IPs.

You could look into active/active or get /24 for yourself and set up BGP peering with ISP at both locations (/24 is smallest subnet that can be advertised into public Internet).

Re: Two separate PA one the same ISP on both location

stefan.tomasevic — Tue, 11 Feb 2025 13:19:12 GMT

@Raido_Rattameister wrote:

You have different /28 at both sides?

With active/passive setup interface config is identical so both firewalls need to have same public IPs.

You could look into active/active or get /24 for yourself and set up BGP peering with ISP at both locations (/24 is smallest subnet that can be advertised into public Internet).

No, one /28 is all what we have. And it is currently active on location A (active passive setup PA850) and we are looking for solution when location A goes down, all traffic (inbound and outbound) go to the DR location (to single PA 850) via dark fiber

Re: Two separate PA one the same ISP on both location

Raido_Rattameister — Tue, 11 Feb 2025 13:56:44 GMT

So you would move passive 850 from location A to DR site?

With 3200 and up you could look into HA Clustering feature.

https://docs.paloaltonetworks.com/pan-os/10-2/pan-os-admin/high-availability/ha-clustering-overview