i figured it out looks like the MR600 does not like or can handle the tunnel interface on the cisco. for anyone with the same / similiar issue here is my config crypto logging session crypto isakmp...

@Sunshine Hi, the MR600 is getting a Public reachable IP Address from the SIM Provider and there is also no issue regarding the MTU. i tried to set up the Tunnel via the LAN IP Addresses and did a...

Hi, since 2 days now I am trying to setup a Site to Site VPN between the MR600 and a Cisco 1941 Phase 1 get's established without a problem but as soon as phase 2 should happen the MR600 is not...