ZyXEL Communications HW-D Series User Manual

P-662H/HW-D Series User’s Guide

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Chapter 16 VPN Screens

My IP Address is the WAN IP address of the ZyXEL Device. The ZyXEL Device has to 
rebuild the VPN tunnel if the My IP Address changes after setup.

The following applies if this field is configured as 0.0.0.0:

• The ZyXEL Device uses the current ZyXEL Device WAN IP address (static or dynamic) 

to set up the VPN tunnel. 

• If the WAN connection goes down, the ZyXEL Device uses the dial backup IP address 

for the VPN tunnel when using dial backup or the LAN IP address when using traffic 
redirect. See the chapter on WAN for details on dial backup and traffic redirect. 

Table 87   AH and ESP

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.

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.

Select MD5 for minimal security and SHA1 for maximum security.