Zyxel-communications 10 Manual do Utilizador descarregar pdf (Página 361)

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101

ZyWALL 10~100 Series Internet Security Gateway

VPN/IPSec Setup 29-3

Table 29-1 AH and ESP

ESP AH

Select DES for minimal security and 3DES for maximum.

Select NULL to set up a tunnel without encryption.

Select MD5 for minimal security and SHA-1 for

maximum security.

DES (default)

Data Encryption Standard (DES) is a widely used method

of data encryption using a private (secret) key. DES

applies a 56-bit key to each 64-bit block of data.

MD5 (default)

MD5 (Message Digest 5) produces a 128-bit

digest to authenticate packet data.

3DES

Triple DES (3DES) is a variant of DES, which iterates

three times with three separate keys (3 x 56 = 168 bits),

effectively doubling the strength of DES.

SHA1

SHA1 (Secure Hash Algorithm) produces a

160-bit digest to authenticate packet data.

29.3 IPSec Summary

Type 1 in menu 27 and then press [ENTER] to display Menu 27.1 — IPSec Summary. This is a summary

read-only menu of your IPSec rules (tunnels). Edit or create an IPSec rule by selecting an index number and

then configuring the associated submenus.

The following figure helps explain the main fields in menu 27.1.

Figure 29-3 IPSec Summary Fields

Local and remote IP addresses must be static.

29.3.1 Keep Alive

A tunnel with no outbound or inbound traffic is "idle" and stays connected until the IPSec SA lifetime period

expires (see section 29.5). The ZyWALL automatically renegotiates the IPSec SA if there is traffic when the

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