VPN Fail Over

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VPN Fail Over

L3 Networker

Dear Team,


We Have PA Firewall With Single ISP and Peer End Sophos FW With Dual ISP.


Here I need to configure VPN Fail over. What are the step i need done PA side? 





L4 Transporter

Hi @karthikeyanB ,


You can configure 2 VPN tunnels with each of remote side ISP connecting IP as remote peer. Configure tunnel monitor on primary one then configure two routes to remote LAN through each of the VPN tunnel with lower metric on primary.

Configure proper security policy for both the connections.


So if primary VPN is down, as the tunnel monitor is configured, the route to remote LANwill be removed and new route with higher metric will be in action which will make the secondary tunnel UP.

L0 Member

Hi everyone,


Tried the configuration @Abdul_Razaq  suggested, no luck.


Created two IPSec Tunnels: 

IPSec Tunnel A: local IP x.x.x.x, peer IP y.y.y.y, tunnel interface tunnel.8

IPSec Tunnel B: local IP x.x.x.x, peer IP z.z.z.z, tunnel interface tunnel.6


Created tunnel monitor




and tried assigning it on the primary IPSec Tunnel A but commit failed stating that:


IPSec tunnel A enabled tunnel monitoring while binding to tunnel interface tunnel.8 which has no IPV4 address assigned to it yet.


which is essentially true since there is no IP address assigned to tunnel.8 interface.


Any ideas how to solve this?

Cyber Elite
Cyber Elite


I do this a different way using either Policy Based Routing or OSPF, even static routing will work. Build your two tunnels. Then do one of the following:

1. Create a Policy Based Forward policy to send the traffic down one tunnel and check the box "Enforce Symetric Return' and Monitor.

2. Setup OSPF and add a metric to the secondary tunnel of like 10000. then OSPF will direct the traffic the correct path that is up, etc.

3. User static routes with path monitoring



Cyber Elite
Cyber Elite


You give the tunnel interface an IP address. You can just assign a /31 for this and ensure that you have the route and policy in place to allow that address to hit the destination IP that you've setup. 

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