l2tp vpn - many connections

Hi,

I didn’t find proper topic, so I create new one.
On monday I will attach config.
There is a problem with l2tp vpn when there is more then one connection from the same ip. If there is a more than one connection from the same ip, previous connection is disabled. From different ip’s it’s ok.
Any idea how to fix it?

Regards
Andrzej

There is one Mikrotik, witch allows to connect many people from the same ip, but I cannot find difference. Th only difference, I found is licence level - 4:it works; 5- it doesn’t work. I repeat: on 5 it doesn’t work!
Is it posiible, licence level does metter at it?

Regards

I found it.
When change ipsec peec/advanced Generate polica to “port stricte”, it works!

Regards

It’s not that easy, as this only works if the clients are using random ports at their end, which is against the specification which says that the L2TP client must also use port 1701.

The whole situation is analyzed and a workaround which covers all cases is proposed here.