Hi there..
I had CHR on my vps running hotspot using l2tp ver3 unmanaged mode at other site behind NAT ( no ip publik ) is runninng well also UM5..butt my problem is when remote site disconneted for some reason the port bridge become unknown and i put it back manualy, is there avalaible L2tp ethernet binding ( look like l2tp server binding)..so it will be back automaticaly, very tirred keep stay on my chair to keep not at unknown port. ,, hope someone have any idea to resolve..