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Intranet mask: Subnet mask of locally protected Intranet.
Security options:
Pre-shared key: Pre-shared key used by negotiation, with the maximum of 128 characters.
Encryption and authentication algorithm 1: The preferred encryption and authentication
algorithm that can be used for negotiation in the second phase.
First phase
Negotiation mode: Sets the negotiation mode in the first phase, with the options: main mode
and aggressive mode. When selecting gateway-to-gateway connection, select the main
mode. When the connection mode is dynamic connection to the gateway, other party
dynamically connecting to the local machine, select the aggressive mode.
Survival time: Sets the survival time of IKE SA, which is at least 600 seconds. When the
remaining time is 540 seconds, the IKE SA will be negotiated again.
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Figure 13_17 IPSec Advanced options -- Main mode
Chapter 13 VPN
Page 165
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