One isp to multiple isp site to site tunnel

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One isp to multiple isp site to site tunnel

L1 Bithead

Hi Team,


We want to configure ipsec site to site tunnel between two locations as per below details


1) Location A having single ISP address i.e Wan address  ( will connect to location B having 2 ISP address ( & and form a IPsec site to site tunnel.


Is it possible for doing the Same ?. If yes how my traffic at location B will differentiate to which tunnel traffic comes and reverse path should be the same 


Cyber Elite
Cyber Elite

Check this thread

Enterprise Architect, Security @ Cloud Carib Ltd
Palo Alto Networks certified from 2011

Cyber Elite
Cyber Elite


The way I do it is to build the tunnels and then setup OSPF between the two sites and make the metric for one of the tunnels higher than the other. This way OSPF determines which tunnel to use and when. If one is down the other takes over, etc.


There are other ways as well such as Policy based forwarding and symmetric return.


Hope this helps.

  • 2 replies
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