Hello Janne, If you have dark fiber and are carring the vlans associated to the security zones & HA1, HA2 accross the fiber it should work correctly. Normally the latency at that distance over dark fiber is very low, therefore you should be ok. What technology will you be using to light the fiber? It should provide you with L1 connectivity between both firewalls effectively as if they were conected across a L2 switch. From the high availability perspective it might not be optimal becuase if the fiber or equipment to light it fails you will end up in a split brain condition. Hope this helps, and let us knwo if your testing goes Ok. Best regards, Jose Muniz
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