Selects the IKE exchange mode.
Note: Main Mode exchanges significantly more unencrypted messages during the IKE handshake than the Aggressive Mode. This is why main mode is far more secure than the aggressive mode.
    - SNMP ID:
 - 2.19.9.7
 - Console path:
 - Setup > VPN > VPN-Peers
 - Possible values:
 - Main mode
 - Aggressive mode
 
- Default:
 - Main mode