Hi Everyone, I for some reason, have two MT devices (A-side is a CCR1009-8G-1S-1S+ and the Z-side is a CHR) and they don't seem to want to tunnel together. The tunnel comes up, two ICMP packets get through, and the link goes down. There is no firewalling in place (or has been disabled altogether for testing purposes) however the issue still manifests. The only thing is on the A side the public IP address is received by DHCP, however a reservation has been set by the carrier so the address will not change. *** A Side *** /interface eoip add allow-fast-path=no disabled=yes ipsec-secret="fakepass" local-address=192.0.2.10 mac-address=12:34:56:78:90:12 name=tun1 remote-address=203.0.113.10 tunnel-id=1 /ip address add address=172.21.254.2/30 interface=tun1 network=172.21.254.0 *** Z Side *** /interface eoip add allow-fast-path=no disabled=yes ipsec-secret="fakepass" local-address=203.0.113.10 mac-address=21:09:87:65:43:21 name=tun1 remote-address=192.0.2.10 tunnel-id=1 /ip address add address=203.0.113.10/29 interface=ether1 network=27.32.52.8 add address=172.21.254.1/30 interface=tun1 network=172.21.254.0 If anyone would be able to point out any issues or have any ideas, it'd be much appreciated! Thanks, Christopher Hawker