My Ip Address; Secure Gateway Address - ZyXEL Communications ZyXEL ZyWALL 2WE User Manual

ZyWALL 2 and ZyWALL 2WE
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.
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.
Select DES for minimal security and 3DES for maximum.
Select NULL to set up a tunnel without encryption.

27.3 My IP Address

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

27.4 Secure Gateway Address

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.
You can also enter a remote secure gateway's domain name in the Secure Gateway Address field if the
remote secure gateway has a dynamic WAN IP address and is using DDNS. The ZyWALL has to rebuild the
VPN tunnel each time the remote secure gateway's WAN IP address changes (there may be a delay until the
DDNS servers are updated with the remote gateway's new WAN IP address).
27.4.1 Dynamic Secure Gateway Address
If the remote secure gateway has a dynamic WAN IP address and does not use DDNS, enter 0.0.0.0 as the
secure gateway's address. In this case only the remote secure gateway can initiate SAs. This may be useful
for telecommuters initiating a VPN tunnel to the company network. See section 27.16 for configuration
examples.
27-2
Table 27-1 AH and ESP
ESP
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.
Select MD5 for minimal security and SHA-1 for
maximum security.
AH
VPN/IPSec Setup