Avaya Business Secure Router 252 Configuration - Basics Uživatelský manuál stáhnout pdf (Strana 244)

244 Chapter 13 VPN

NN47923-500

Multiple Proposal Select this check box to allow the Business Secure Router to use any

of its phase 2 encryption and authentication algorithms when

negotiating an IPSec SA.

Clear this check box to have the Business Secure Router use only the

phase 2 encryption and authentication algorithms when negotiating an

IPSec SA.

Active Protocol Select ESP or AH from the drop-down list. The Business Secure

Router's IPSec Protocol must be identical to the remote IPSec router.

The ESP (Encapsulation Security Payload) protocol (RFC 2406)

provides encryption as well as the authentication offered by AH. If you

select ESP here, you must select options from the Encryption

Algorithm and Authentication Algorithm fields. The AH protocol

(Authentication Header Protocol) (RFC 2402) was designed for

integrity, authentication, sequence integrity (replay resistance), and

nonrepudiation, but not for confidentiality, for which the ESP was

designed. If you select AH here, you must select options from the

Authentication Algorithm field.

Encryption

Algorithm

Select DES, 3DES, AES or NULL from the drop-down list.

When you use one of these encryption algorithms for data

communications, both the sending device and the receiving device

must use the same secret key, which can be used to encrypt and

decrypt the message or to generate and verify a message

authentication code. The DES encryption algorithm uses a 56-bit key.

Triple DES (3DES) is a variation on DES that uses a 168-bit key. As a

result, 3DES is more secure than DES. It also requires more

processing power, resulting in increased latency and decreased

throughput. You can select a 128-bit, 192-bit, or 256-bit key with this

implementation of AES. AES is faster than 3DES.

Select NULL to set up a tunnel without encryption. When you select

NULL, you do not enter an encryption key.

Authentication

Algorithm

Select SHA1 or MD5 from the drop-down list. MD5 (Message Digest

5) and SHA1 (Secure Hash Algorithm) are hash algorithms used to

authenticate packet data. The SHA1 algorithm is generally considered

stronger than MD5, but is slower. Select MD5 for minimal security and

SHA-1 for maximum security.

SA Life Time Define the length of time before an IKE SA automatically renegotiates

in this field. It can range from 60 to 3 000 000 seconds (almost 35

days). A short SA life time increases security by forcing the two IPSec

routers to update the encryption and authentication keys. However,

every time the VPN tunnel renegotiates, all users accessing remote

resources are temporarily disconnected.

Encapsulation Select Tunnel mode or Transport mode from the drop-down list. The

Business Secure Router's encapsulation mode must be identical to

the remote IPSec router. Tunnel is compatible with NAT, Transport is

not.

Table 57 VPN Branch Office Advanced Rule Setup

Label Description

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