Avaya Business Secure Router 252 Configuration - Basics Manuel d'utilisateur télécharger pdf (Page 239)

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Chapter 13 VPN 239

Nortel Business Secure Router 252 Configuration — Basics

Figure 74 Two phases to set up the IPSec SA

In Phase 1 you must:

• Choose a negotiation mode.

• Authenticate the connection by entering a preshared key.

• Choose an encryption algorithm.

• Choose an authentication algorithm.

• Choose a Diffie-Hellman public-key cryptography key group (DH1, DH2,

and DH5).

• Set the IKE SA lifetime. In this field you can determine how long an IKE SA

will stay up before it times out. An IKE SA times out when the IKE SA

lifetime period expires. If an IKE SA times out when an IPSec SA is already

established, the IPSec SA stays connected.

In Phase 2 you must:

• Choose which protocol to use (ESP or AH) for the IKE key exchange.

• Choose an encryption algorithm.

• Choose an authentication algorithm

• Choose whether to enable Perfect Forward Secrecy (PFS) using

Diffie-Hellman public-key cryptography–see “Perfect Forward Secrecy

(PFS)” on page 241. Select None (the default) to disable PFS.

• Choose Tunnel mode or Transport mode.

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