Still problems with reconnecting / clean close old session in case of WAN-Interface up/down with some routers

[Himan2001]

There is still the issue, that on many routers after the WAN reconnect/disconnect/go online/offline the session for this MLVPN-WAN-Interface behind a NATed Router comes never up again:

With AVM Fritzboxes ist works, but not with OpenWRT, Tomato or any Type of Telekom LTE-Routers, or mainly all
Huawei devices for LTE...

When The LTE Network resets/restarts, the session belongs to always down. With a /etc/init.d/mlvpn restart the missing session instead comes asap again up.

Looks like, there is a cleaner previous session clossing nessassary when a link is considered offline, so a new NAT-compatible session can be re-established without cold restarting the mlvpn client daemon.

I asume this has todo by reusing a still open Session on a specific Port to the Router, without clean close/clean/restart on the fly to make it work with any Router not just a few AVM Fritzboxes ?

Actualy there is a cron job needed to parse for an "!lteblableh" and then RESTART the entire daemon - but this interrupts the actualy running sessions. In case the LTE link comes not asap up, this ends in a continous 60 seconds cold restart until the LTE link is up again, which is a terrible quickfix and is not very reliable for production.