Manual

Billion BiGuard VPN Client
Chapter 4: VPN Configuration
33
Misc (Misc): log level for configuration reading or dump of low level messages
Trpt (Transport): log level for UDP transport mode
Msg (Message): log level for IKE decode
Cryp (Crypto): log level and dump for crypto material exchanged
Timr (Timer): log level about timers
Sdep (Sysdep): log level about IKE interface from/to IPSec
SA (SA): log level for SA managment
Exch (Exchange): log level about IKE exchanges (very useful)
Nego (Negotiation): log level about phase 1 and phase 2 negotiations
Plcy (Policy): not used
All (All): Apply the same log level to all subsystems
Most of the time log level set to 0 is largely enough for resolving configuration issues.