UTT N518W Manual page 187

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Exchange Mode: Specify the exchange mode used for IKE phase 1 negotiation.
The available options are Main and Aggressive. If the Connection Type is
Bidirectional, you should choose Main mode; else, you should choose Aggressive
Mode.
SA Lifetime: It refers to IKE SA lifetime, which specifies the number of seconds
(at least 600 seconds) an IKE SA will exist before expiring. A new IKE SA is
negotiated 540 seconds before the existing IKE SA expires.
Encrypt/Auth Algorithms 1 ~ Encrypt/Auth Algorithms 4 (Phase 1): They refer to
phase 1 proposal that specifies a set of security algorithms for phase 1
negotiation. A phase 1 proposal includes an encryption algorithm, an
authentication algorithm, and a DH group. You can choose up to four phase 1
proposals.
Encrypt/Auth Algorithms 2 ~ Encrypt/Auth Algorithms 4 (Phase 2): They refer to
phase 2 proposal that specifies a set of security protocols and algorithms for
phase 2 negotiation. You can choose up to three phase 2 proposals together with
P2 Encrypt/Auth Algorithms 1.
SA Lifetime: It refers to IPSec SA time lifetime, which specifies the number of
seconds (at least 600 seconds) an IPSec SA will exist before expiring. A new
IPSec SA is negotiated 540 seconds before the existing IPSec SA expires.
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Figure 13-16 IPSec Advanced settings
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