Avaya Business Secure Router 222 Configuration - Basics Bedienungsanleitung PDF herunterladen (Seite 239)

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Chapter 13 VPN 239

Nortel Business Secure Router 222 Configuration — Basics

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 240. Select None (the default) to disable PFS.

• Choose Tunnel mode or Transport mode.

• 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 VPN switches have keep alive enabled, even if there is no

traffic. If an IPSec SA times out, the VPN switch 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.

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