Avaya Business Secure Router 252 Configuration - Basics Instrukcja Użytkownika Pobierz pdf (Strona 240)

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240 Chapter 13 VPN

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• Set the IPSec SA lifetime. In this field, you can determine how long the IPSec

SA will stay up before it times out. The Business Secure Router automatically

renegotiates the IPSec SA if there is traffic when the IPSec SA lifetime period

expires. The Business Secure Router also automatically renegotiates the

IPSec SA if both IPSec routers have keep alive enabled, even if there is no

traffic. If an IPSec SA times out, the IPSec router must renegotiate the SA the

next time someone attempts to send traffic.

Negotiation Mode

The phase 1 Negotiation Mode you select determines how the Security

Association (SA) is established for each connection through IKE negotiations.

Main Mode ensures the highest level of security when the communicating parties

are negotiating authentication (phase 1). It uses six messages in three round trips:

SA negotiation, Diffie-Hellman exchange, and an exchange of nonces (a nonce is

a random number). This mode features identity protection (your identity is not

revealed in the negotiation).

Aggressive Mode is quicker than Main Mode because it eliminates several steps

when the communicating parties are negotiating authentication (phase 1).

However the trade-off is that faster speed limits its negotiating power and it also

does not provide identity protection. It is useful in remote access situations where

the address of the initiator is not known by the responder and both parties want to

use preshared key authentication.

Preshared key

A preshared key identifies a communicating party during a phase 1 IKE

negotiation. It is called preshared because you have to share it with another party

before you can communicate with the party over a secure connection.

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