Just to update on this discussion since I ran into it as well - Alcatel is technically violating the l2tp rfc. When the tunnel is in established state, Alcatel will send a second/new SCCRQ in an attempt to establish a second/new tunnel using the same connection details (srcIP/port+dstIP/port) as the first one. (SCCRQ is only valid in idle state - so it gets ignored by mpd once a tunnel is in established state) Some vendors (C/J/A) let it pass/establish as it doesn't really affect sessions - as the...