ZyXEL Communications 2 Plus User Manual

 Chapter 14 IPSec VPN

ZyWALL 2 Plus User’s Guide

This section provides more details about IKE SAs.

The IKE SA proposal is used to identify the encryption algorithm, authentication algorithm, 
and Diffie-Hellman (DH) key group that the ZyWALL and remote IPSec router use in the IKE 
SA. In main mode, this is done in steps 1 and 2, as illustrated below.

Figure 173   IKE SA: Main Negotiation Mode, Steps 1 - 2: IKE SA Proposal

The ZyWALL sends one or more proposals to the remote IPSec router. (In some devices, you 
can set up only one proposal.) Each proposal consists of an encryption algorithm, 
authentication algorithm, and DH key group that the ZyWALL wants to use in the IKE SA. 
The remote IPSec router selects an acceptable proposal and sends the accepted proposal back 
to the ZyWALL. If the remote IPSec router rejects all of the proposals (for example, if the 
VPN tunnel is not configured correctly), the ZyWALL and remote IPSec router cannot 
establish an IKE SA.

Click this icon to display a screen in which you can change the settings of a 

gateway or network policy. 

Click this icon to delete a gateway or network policy. When you delete a 

gateway, the ZyWALL automatically moves the associated network policy(ies) 

to the recycle bin. When you delete a network policy, it is just deleted. 

Click this icon to establish a VPN connection to a remote network. 

Click this icon to drop a VPN connection to a remote network. 

Y/N

This field displays whether a network policy is turned on (Y) or not (N). Click 

the letter to change it to the other state (click Y to change it to N or N to 

change it to Y).

Recycle Bin

The recycle bin appears when you have any network policies that are not 

associated to a gateway policy. 
When you delete a gateway, the ZyWALL automatically moves the associated 

network policy(ies) to the recycle bin. 
You can also manually move a network policy that you do not need (but may 

want to use again later) to the recycle bin. Click the network policy’s move or 

edit icon and set it’s Gateway Policy to Recycle Bin. 

Table 64   SECURITY > VPN > VPN Rules (IKE)  (continued)