tunnel over 3g

Hello, i have a problem.

I have a 3g connection on a 751u mikrotik. The ip from 3G provider is private and dynamic.
On the other side i have a mikrotik with static public ip.

I searched and i didn’t found a solution (tunnel) when is a public ip (Statipc) on one end and a dynamic (PPP) private ip on the other end.

PS: I tried even PPTP but doesn’t work over PPP connection

There is a solution to this ?

You should be able to run a PPTP session over the 3G PPP connection.

in pptp when adding new bridge port, there is no ppp interface to choose from, only ethernet.

No idea what you are looking at there - you could add a PPTP Client interface to connect to a remote router using PPTP - have done so many times.

because i need the tunnel to get out with the PPTP server IP, i must use BCP bridging - or am i wrong ?

example: http://wiki.mikrotik.com/wiki/Manual:BCP_bridging_(PPP_tunnel_bridging)

Hello.
if you want to layer 2 connectivity between two remote network you can use BCP.BCP allow you to bridge two remote network via PPP interface.