Hello   I need to establish an L2TP tunnel from a Cisco device connected on the LAN behind an MX firewall to another Cisco device on the Internet. The public IP of the peer can be reached from the LAN (ping is ok from the LAN interface of the MX or from the core switch). When I run a capture from the MX, I can see the following continuously : No. Time Source Destination Protocol Length Info 34 63.916202 10.128.2.55 1xx.xxx.xxx.xx4 L2TPv3 233 Control Message - SCCRQ (tunnel id=0) 35 64.915625 10.128.2.55 1xx.xxx.xxx.xx4 L2TPv3 233 Control Message - SCCRQ (tunnel id=0) 36 66.915588 10.128.2.55 1xx.xxx.xxx.xx4 L2TPv3 233 Control Message - SCCRQ (tunnel id=0) 37 69.999936 Cisco_49:02:e6 Cisco_49:02:e6 LOOP 64 Reply 38 70.915855 10.128.2.55 1xx.xxx.xxx.xx4 L2TPv3 129 Control Message - StopCCN (tunnel id=0) The tunnel is never established. I have no specific ACL on the MX or the core. Do you have any idea where to look at ? I 've no specific log. Could it be related to the L2TP configuration ?   If I connect the Cisco device directly on a DSL line, the L2TP tunnel is established immediatly.   Thanks Regards ... View more