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Chapter 20 IPSec VPN
ZyWALL 110/310/1100 Series User’s Guide
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20.6 IPSec VPN Background Information
Here is some more detailed IPSec VPN background information.
IKE SA Overview
The IKE SA provides a secure connection between the ZyWALL and remote IPSec router.
It takes several steps to establish an IKE SA. The negotiation mode determines how many. There
are two negotiation modes--main mode and aggressive mode. Main mode provides better security,
while aggressive mode is faster.
Note: Both routers must use the same negotiation mode.
These modes are discussed in more detail in Negotiation Mode on page 308 . Main mode is used in
various examples in the rest of this section.
IP Addresses of the ZyWALL and Remote IPSec Router
To set up an IKE SA, you have to specify the IP addresses of the ZyWALL and remote IPSec router.
You can usually enter a static IP address or a domain name for either or both IP addresses.
Sometimes, your ZyWALL might offer another alternative, such as using the IP address of a port or
interface, as well.
You can also specify the IP address of the remote IPSec router as 0.0.0.0. This means that the
remote IPSec router can have any IP address. In this case, only the remote IPSec router can initiate
an IKE SA because the ZyWALL does not know the IP address of the remote IPSec router. This is
often used for telecommuters.
Move Use Move to reorder a selected entry. Select an entry, click Move, type the number where
the entry should be moved, press <ENTER>, then click Apply.
Status This icon shows if the entry is active (yellow) or not (gray). VPN rule settings can only be
retrieved when the entry is activated (and Enable Configuration Provisioning is also
selected).
Priority Priority shows the order of the entry in the list. Entry order is important as the ZyWALL
searches entries in the order listed here to find a match. After a match is found the ZyWALL
stops searching.
VPN Connection This field shows all configured VPN rules that match the rule criteria for the
ZyWALL IPSec
VPN client. Select a rule to bind to the associated user or group.
Allowed User Select which user or group of users is allowed to retrieve the associated VPN rule settings
using the
ZyWALL IPSec
VPN client. A user may belong to a number of groups. If entries
are configured for different groups, the ZyWALL will allow VPN rule setting retrieval based
on the first match found.
Users of type admin or limited-admin are not allowed.
Apply Click Apply to save your changes back to the ZyWALL.
Reset Click Reset to return the screen to its last-saved settings.
Table 113
Configuration > VPN > IPSec VPN > Configuration Provisioning (continued)
LABEL DESCRIPTION