ZyXEL Communications P-335WT User Manual

P-335 Series User’s Guide

165 

Chapter 13 VPN Screens

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Table 67   AH and ESP

DES (default)
Data Encryption Standard (DES) is a 

widely used method of data encryption 

using a secret key. DES applies a 56-bit 

key to each 64-bit block of 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. 

AES
Advanced Encryption Standard is a 

newer method of data encryption that 

also uses a secret key. This 

implementation of AES applies a 128-bit 

key to 128-bit blocks of data. AES is 

faster than 3DES.

Select NULL to set up a phase 2 tunnel 

without encryption.

MD5 (default)
MD5 (Message Digest 5) produces a 

128-bit digest to authenticate packet 

data.

MD5 (default)
MD5 (Message Digest 5) produces a 

128-bit digest to authenticate packet 

data.

SHA1
SHA1 (Secure Hash Algorithm) 

produces a 160-bit digest to 

authenticate packet data.

SHA1
SHA1 (Secure Hash Algorithm) 

produces a 160-bit digest to 

authenticate packet data.

My IP Address is the WAN IP address of the Prestige. If this field is configured as 0.0.0.0, 
then the Prestige will use the current Prestige WAN IP address (static or dynamic) to set up the 
VPN tunnel. The Prestige has to rebuild the VPN tunnel if the My IP Address changes after 
setup. 

Secure Gateway Address is the WAN IP address or domain name of the remote IPSec router 
(secure gateway).

If the remote secure gateway has a static WAN IP address, enter it in the Secure Gateway 
Address field. You may alternatively enter the remote secure gateway’s domain name (if it 
has one) in the Secure Gateway Address field.