Dual ISP Failover with site to site VPNs

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Dual ISP Failover with site to site VPNs

L0 Member

Hey everyone,

Just started with Palo and was researching the optimal way of configuring ISP failover to include automatic failover of site to site tunnels.

Is there a reason to use PBF over static route removal?

Based on the reading date I was doing today, SRR appears less convoluted than PBF and seems the most similar to Cisco's SLA configuration which worked well for me before.

omegle

Thanks

4 REPLIES 4

Cyber Elite
Cyber Elite

Hello,

I have done this many times. First I setup VPN connections via both ISP's. Then I create OSPF adjacencies between the two VPN endpoints. I then use metrics so that I force the traffic down the VPN tunnel I choose as primary and secondary. So for the secondary i would choose a metric such as 5000, this makes sure the primary tunnel is the preferred one.

I have also used Policy based forwarding to accomplish the same thing. IT all depends on which one you are most comfortable with.

 

Regards,

 

 

Cyber Elite
Cyber Elite

Hi @Evahi21 ,

 

If you have at least 1 public IP address advertised to both ISPs, I would use a loopback for a single VPN tunnel.  That design is by far the simplest, but requires a separate public subnet than the ones on the interfaces.

 

Thanks,

 

Tom

Help the community: Like helpful comments and mark solutions.

Hi,

 

I am having similar issue, but I need more guidelines. I have two ISPs and I want each of them to be used for primary and secondary between Palo Alto and Cisco ASA. From the ASA side, I kept have issue each time I try to bring up the two tunnel at the same time. So far I can only have one tunnel up and when the primary is down, I have to delete the tunnel for it on the ASA side and have only the secondary tunnel used at a time.

Is there are a way to configure this correctly?

 

Please advise from your experience.

Cyber Elite
Cyber Elite

Hello,

So you want one tunnel one each ISP? This should be possible as long as the public IP's you are using on the PA are different. I recall Cisco having troubles when you try to connect two Tunnels to the same device on the other side but could be remembering this incorrectly.

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