ZyXEL Communications 792H manual My IP Address, Dynamic Secure Gateway Address, AH and ESP

Prestige 792H G.SHDSL Router

Table 14-1 AH and ESP

ESP	AH
DES (default)	MD5 (default)
Data Encryption Standard (DES) is a widely used method	MD5 (Message Digest 5) produces a 128-bit
of data encryption using a private (secret) key. DES	digest to authenticate packet data.
applies a 56-bit key to each 64-bit block of data.
3DES	SHA1
Triple DES (3DES) is a variant of DES, which iterates	SHA1 (Secure Hash Algorithm) produces a
three times with three separate keys (3 x 56 = 168 bits),	160-bit digest to authenticate packet data.
effectively doubling the strength of DES.
Select DES for minimal security and 3DES for maximum.	Select MD5 for minimal security and SHA-1for
Select NULL to set up a tunnel without encryption.	maximum security.

14.3 My IP Address

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.

14.4 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 Prestige 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).

14.4.1 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 14.16 for configuration examples.

14-2 VPN Screens