IPSec Site-to-Site

maschimidt · ‎06-25-2020

Hello

I Have one client using vpn site-to-site with my company, now another customer has appeared in which the network segment is the same as that of the first customer, that is, both have the 10.1.0.0/16 network "Phase 2 Selectors - Remote Address" . How would you handle the ipsec tunnel for this other customer?

Thanks all

sw2090 · ‎06-26-2020

That's not basically a problem of the ipsec tunnel. It is simply overlapping subnets on your FGT. You cannot route the same subnet to two different interfaces.

One can cope this with mappings if both sides have a fortigate and then use the mapped subnet instead of the original ones. There is a kb article on this when you google for "fortigate overlapping subnet".

--

"It is a mistake to think you can solve any major problems just with potatoes." - Douglas Adams

View solution in original post

sw2090 · ‎06-26-2020

That's not basically a problem of the ipsec tunnel. It is simply overlapping subnets on your FGT. You cannot route the same subnet to two different interfaces.

One can cope this with mappings if both sides have a fortigate and then use the mapped subnet instead of the original ones. There is a kb article on this when you google for "fortigate overlapping subnet".

--

"It is a mistake to think you can solve any major problems just with potatoes." - Douglas Adams

maschimidt · ‎06-26-2020

I find..

https://docs.fortinet.com/document/fortigate/6.0.0/cookbook/657805/site-to-site-ipsec-vpn-with-overl...

Thanks

IPSec Site-to-Site

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