Draytek Vigor2830 Series User Manual page 269

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 algorithms.

IKE phase 1 key lifetime-For security reason, the
lifetime of key should be defined. The default value is
28800 seconds. You may specify a value in between
900 and 86400 seconds.

IKE phase 2 key lifetime-For security reason, the
lifetime of key should be defined. The default value is
3600 seconds. You may specify a value in between
600 and 86400 seconds.

Perfect Forward Secret (PFS)-The IKE Phase 1 key
will be reused to avoid the computation complexity in
phase 2. The default value is inactive this function.
Local ID-In Aggressive mode, Local ID is on behalf
of the IP address while identity authenticating with
remote VPN server. The length of the ID is limited to
47 characters.
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Vigor2830 Series User's Guide