ZyXEL Communications 70 Series User Manual

ZyWALL 5/35/70 Series User’s Guide

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Chapter 19 VPN Screens

Manual key management is useful if you have problems with IKE key management.

An SPI is used to distinguish different SAs terminating at the same destination and using the 
same IPSec protocol. This data allows for the multiplexing of SAs to a single gateway. The 
SPI (Security Parameter Index) along with a destination IP address uniquely identify a 
particular Security Association (SA). The SPI is transmitted from the remote VPN gateway to 
the local VPN gateway. The local VPN gateway then uses the network, encryption and key 
values that the administrator associated with the SPI to establish the tunnel.

Note: Current ZyXEL implementation assumes identical outgoing and incoming SPIs.

Click the edit icon on the VPN Rules (Manual) screen to edit VPN rules. 

IPSec Algorithm

This field displays the security protocols used for an SA. 
Both AH and ESP increase ZyWALL processing requirements and communications 

latency (delay). 

Remote Gateway 

Address

This is the static WAN IP address or domain name of the remote IPSec router. 

Modify

Click the edit icon to edit the VPN policy. 
Click the delete icon to remove the VPN policy. A window displays asking you to 

confirm that you want to delete the VPN rule. When a VPN policy is deleted, 

subsequent policies move up in the page list.
Click the dial icon to dial up the connection manually. If a VPN tunnel has been built 

and dialed up, every time you click this icon, a warning message appears in the 

status bar on the bottom of the screen.

Add

Click Add to add a new VPN policy.

Table 104   VPN Rules (Manual)  (continued)