ZyXEL Communications ZyXEL ZyWALL 2WG - Manual (Page 273)

Chapter 14 IPSec VPN
ZyWALL 2WG User’s Guide
273
14.6 IPSec SA Overview
Once the ZyWALL and remote IPSec router have established the IKE SA, they can securely
negotiate an IPSec SA through which to send data between computers on the networks.
"
The IPSec SA stays connected even if the underlying IKE SA is not available
anymore.
This section introduces the key components of an IPSec SA.
14.6.1 Local Network and Remote Network
In IPSec SA, the local network, the one(s) connected to the ZyWALL, may be called the local
policy. Similarly, the remote network, the one(s) connected to the remote IPSec router, may be
called the remote policy.
14.6.2 Active Protocol
The active protocol controls the format of each packet. It also specifies how much of each
packet is protected by the encryption and authentication algorithms. IPSec VPN includes two
active protocols, AH (Authentication Header, RFC 2402) and ESP (Encapsulating Security
Payload, RFC 2406).
"
The ZyWALL and remote IPSec router must use the same active protocol.
Associated
Network Policies
The following table shows the policy(ies) you configure for this rule.
To add a VPN policy, click the add network policy (
) icon in the VPN Rules
(IKE) screen (see Figure 144 on page 260 ). Refer to Section 14.7 on page 275 for
more information.
# This field displays the policy index number.
Name This field displays the policy name.
Local Network This field displays one or a range of IP address(es) of the computer(s) behind the
ZyWALL.
Remote Network This field displays one or a range of IP address(es) of the remote network behind
the remote IPsec router.
Apply Click Apply to save your changes back to the ZyWALL.
Cancel Click Cancel to exit this screen without saving.
Table 84 SECURITY > VPN > VPN Rules (IKE) > Edit Gateway Policy (continued)
LABEL DESCRIPTION