I am trying to connect a branch office network (Cisco RV320 router) with our other branches Drayteks (2820, 2950, 3900). Both devices look to support common settings but fails to connect. Triple checked all settings, Tried all possible SA, key and encryptions combination to no avail. I am familiar with VPN issues but this time I can not figure out what's wrong. The RV320 syslog does not output enough VPN log to troubleshoot.
consitent phases setting on both devices, tested all groups, hashes and encryptions
correct routes and interfaces
local security group : subnet
using PFS did not help
no idea if the "AH Hash Algorithm" needs to be checked, tried all anyway
does the Cisco uses ESP or AH protocol? this may be worth to know
Is the IPsec implementation of Cisco compatible with Drayteks?
Did somebody ever managed to connect those 2 devices?
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