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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)
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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
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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
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@Aaron, its completely an Azure restriction
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by:ArneLovius
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complete and concise
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