I guess, since Meraki only work in Main Mode, I need to set the Yamaha in Main Mode as well. For that I will need to explicitly stated Meraki public IP in Yamaha router config ;   ipsec ike remote address gateway_id Meraki_public_IP   Initially I input Any at the Meraki_public_IP on Yamaha, which put Yamaha on aggressive mode and I am guessing because of that they can't establish any connection hence failing at phase 1 due to time up.   I am not sure if above explanation correct or not, but once change that, it seems to make it work fine and my tunnel has been up until now.         ... View more