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idanatzis
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Joined: Fri Oct 23, 2020 4:47 pm

Fortigate to Mikrotik VPN problem

Tue May 18, 2021 1:09 pm

Hello team,

Hope this post finds all of you healthy.
I have a really odd problem with one IPSec VPN connection I am trying to build.

The VPN connection is beetwen a Fortigate and a Mikrotik CCR1016-12G.
Although the VPN is becoming active no traffic is forwarded. I tried the exact same configuration on a mikrotik RB4011,on a RB3011, on a hap ac2, on a Mikrotik hEX etc but the result was the same.
Once I configured the IPSec on a Mikrotik CCR1036-8G-2S+, the traffic was forwarding normally.
Is there any hardware specifications that I am missing or something else that any one of you have in mind that can help me?

Just to save you some time in all of the tests that I performed I had my firewall rules on the Mikrotik's side disable, to be sure nothing was blocked from this side and at the Fortigate side the config nearly did not change at all. The only this that I changed each time was the public IP of the remote peer because I used different costumers locations.

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