PA220 PANOS 8.0.7 Dual ISP

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PA220 PANOS 8.0.7 Dual ISP

L2 Linker

Hello Everyone

 

I know there is a fair amount of information on this topic but I have a few issues/questions

 

I have a PA220 with PANOS 8,0,7. My questions are relating to dual ISP connectivity. I would like to setup my PA with a backup ISP connection. I do have IPsec tunnels. But I am allowing for the second tunnel to negotiate when the backup ISP comes up. So both tunnels don't have to be "up and ready" 

 

I have read the following article which is based on 2 VRs with PBFs to push traffic to the primary ISP with monitoring. When monitoring fails it will "failover" to use the second ISP

https://live.paloaltonetworks.com/t5/Configuration-Articles/How-to-Configure-a-Palo-Alto-Networks-Fi...

 

I have also read the following article which I believe is now available in PANOS 8. This configuration use 2 default routes. The first 1 will have a lower metric. Let's say 10 with monitoring enabled and the second default route has a higher metric let's say 50. 

https://www.paloaltonetworks.com/documentation/80/pan-os/pan-os/networking/static-routes/static-rout...

 

Basically can I achieve dual ISP with tunnels available on both untrusted ISP connections with the second article (default routes and path monitoring) Again I don't mind the short amount of time for tunnel negotiate. It's a branch office PA and I don't really want to configure 2 VRs.

 

Thank you, really appreciate any help on this

 

22 REPLIES 22

Cyber Elite
Cyber Elite

Hi @Nick.Spender!

 

yes, this should work

 

The first article highlights a scenario that guarantees minimum downtime because both your tunnels are up. If a short downtime is not a big concern you can simply use the static route removal in PAN-OS 8.0

Tom Piens
PANgurus - Strata specialist; config reviews, policy optimization

@reaper

 

Thank you Reaper.

 

I am testing path monitoring route now.....lets see how it goes

 

Thank you for all your comments and replies

L2 Linker

@reaper

 

I am setting up each above article, currently testing the path monitoring method for static routes. When I fail over the ISP I get a real strange issue. its not tearing down the tunnel connected to 1/1

 

Untitled1.png

Did you enable tunnel monitor in the ipsec configuration?

Tom Piens
PANgurus - Strata specialist; config reviews, policy optimization

@reaper

 

No....As the other side isnt a PA 😞

ah, that's a problem...

 

ok so how about you only create one tunnel locally, since the remote end will remain the same destination IP, and create a dynamic tunnel on the remote end (identification of PANW peer by means of email address or hostname for phase1 instead of it's IP)

then you could simply fail over the 1 tunnel to the second ISP and your remote peer will simply see a new tunnel com from a different source ip

 

Tom Piens
PANgurus - Strata specialist; config reviews, policy optimization

@reaper

 

When you say "hen you could simply fail over the 1 tunnel to the second ISP and your remote peer will simply see a new tunnel com from a different source ip" is that a manual process? 

 

Thanks again 😉 

That should happen automnatically: your primary default gateway fails so your tunnel will resort to using the second default gateway to try and get to the remote end

 

thinking about this a bit more, maybe I should try reproduction in the lab... (haven't set this scenario up live yet, there may be complications)

 

there are a few complicating factors that could ruin the party

Tom Piens
PANgurus - Strata specialist; config reviews, policy optimization

I will give it a go 

 

Thank you @reaper

@reaper 

 

On a side note...Do you think the other article (the 2 VR method) would cause the same issues? 

https://live.paloaltonetworks.com/t5/Configuration-Articles/How-to-Configure-a-Palo-Alto-Networks-Fi...

 

 

Hello @Nick.Spender,

I would just like to point out that you do not need two seperate VR's for this type of scneario. I have done it multiple times with just 1 VR and PBF with static route failover. THe other way is to use a dynamic routing protocol and add route costs to the link you call secondary.

 

Regards,

@OtakarKlier

 

But what the 2 default routes?

 

with 1 VR you cant use 2 default routes unless you use path monitoring for the 0.0.0.0/0 routes?

Hello,

There would only be one default route in the VR, e.g. the backup path. The PBF would be the primary route with a monitor and a disable option. Since PBF takes effect before the routing table, unless the PBF is down, the default route will not be used.

 

Hope that makes sense.

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