Draytek VIGOR2950 User Manual page 107

IKE phase 1 mode -Select from Main mode and Aggressive
mode. The ultimate outcome is to exchange security proposals
to create a protected secure channel. Main mode is more
secure than Aggressive mode since more exchanges are done
in a secure channel to set up the IPSec session. However, the
Aggressive mode is faster. The default value in Vigor router is
Main mode.
IKE phase 1 proposal-To propose the local available
authentication schemes and encryption algorithms to the VPN
peers, and get its feedback to find a match. Two combinations
are available for Aggressive mode and nine for Main mode.
We suggest you select the combination that covers the most
schemes.
IKE phase 2 proposal-To propose the local available
algorithms to the VPN peers, and get its feedback to find a
match. Three combinations are available for both modes. We
suggest you select the combination that covers the most
Vigor2950 Series User's Guide 99