VPN Polices used for a specific connection - what log

Hi,

i am looking for the correct log file where i can ...

see what VPN connection is using what type of encryption for phases and encryption.

Background

I have a VPN from XG to Fortigate with a throughput of about 5MB/s in a 50MBit WAN connection.

And

I have a VPN from XG-LANCOM with a terrible troughput.

Most of the time between 400-1800KBit/s. LANCOM is connected to a fibre connection (400/200) and i want to start with the same setting.

It´s the same XG, only with two VPN settings.

I don´t think that MTU is a problem (1500).
the fortigate connection uses the same WAN interface.

thanks

Jürgen