AES 256-CBC cipher is not considered strong ?
With L2tp/Ipsec I have problem when two people over same ip try to connect, one of them is kicked after few time.
There is an explanation from @sindy as to why this happens…
There it is :http://forum.mikrotik.com/t/multiple-road-warrior-l2tp-ipsec-clients-behind-nat-solved/118206/1
However this seems to be fixed…
*) l2tp - fixed multiple tunnel establishment from the same remote IP address (introduced in v6.47);
https://mikrotik.com/download/changelogs
So, what is your ROS version ?