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Azure Site to Site VPN redundancy over multiple WAN links.

Posted on 2016-08-22
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Last Modified: 2016-09-11
I'm trying to configure an Azure Site to Site VPN with redundancy over multiple WAN uplinks.

However, according to this:

https://social.msdn.microsoft.com/Forums/azure/en-US/b64107be-6a74-477f-9ed4-eed0d500b945/sitetosite-vpn-connecting-to-dual-wan-router-failover?forum=WAVirtualMachinesVirtualNetwork

This is not possible.

I've created a Route-Based VPN in Azure to a Cisco 2911 successfully. I am able to pass traffic, and I can add another S2S VPN to the same Virtual Gateway in Azure, but I cannot reference the same on-premise subnet. According to this azure document its just not possible still:

https://azure.microsoft.com/en-us/documentation/articles/vpn-gateway-multi-site/

Is there any way to make this work?

If not will AWS be able to do it? My goal is to provide redundant VPN links to cloud services hosting a backup of our DC/NPS.

Thanks for any input!
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Question by:Gina Zing
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ArneLovius earned 500 total points (awarded by participants)
ID: 41766723
It is not possible to have multiple endpoints with the same subnet.

If you had PI address space that was advertised by more than one ISP (usually using BGP4 as a routing protocol) you could have redundancy across your internet connections while still using a single endpoint.
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by:Aaron Tomosky
ID: 41767077
Ive used sonicwalls to create a VPN tunnel with a secondary gateway IP to other sonicwalls and fortinet sand palo altos and it's worked fine with a secondary wan but I think this is a limitation with azure, not IPSec VPN tunnels as a whole.
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by:ArneLovius
ID: 41767124
@Aaron, its completely an Azure restriction
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Expert Comment

by:ArneLovius
ID: 41793214
complete and concise
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