ZyXEL Communications ZyWALL 2 Plus - Manual (Page 286)

Chapter 14 IPSec VPN
ZyWALL 2 Plus User’s Guide
286
Figure 186 SECURITY > VPN > SA Monitor
The following table describes the labels in this screen.
14.14 VPN Global Setting
Click SECURITY > VPN > Global Setting to open the VPN Global Setting screen. Use this
screen to change settings that apply to all of your VPN tunnels.
14.14.1 Local and Remote IP Address Conflict Resolution
Normally, you do not configure your local VPN policy rule’s IP addresses to overlap with the
remote VPN policy rule’s IP addresses (see
Section 14.6.2 on page 271 ). For example, you
usually would not configure both with 192.168.1.0. However, overlapping local and remote
network IP addresses can occur with dynamic VPN rules or IP alias.
14.14.1.1 Dynamic VPN Rule
Local and remote network IP addresses can overlap when you configure a dynamic VPN rule
for a remote site (see
Figure 187 ). For example, when you configure ZyWALL X, you
configure the local network as 192.168.1.0/24 and the remote network as any (0.0.0.0). The
“any” includes all possible IP addresses. It will forward traffic from network A to network B
even if both the sender (for example 192.168.1.8) and the receiver (for example 192.168.1.9)
are in network A. Note that the remote access can still use the VPN tunnel to access computers
on ZyWALL X’s network.
Table 73 SECURITY > VPN > SA Monitor
LABEL DESCRIPTION
# This is the security association index number.
Name This field displays the identification name for this VPN policy.
Local Network This field displays the IP address of the computer using the VPN IPSec feature of
your ZyWALL.
Remote Network This field displays IP address (in a range) of computers on the remote network
behind the remote IPSec router.
Encapsulation This field displays Tunnel or Transport mode.
IPSec Algorithm This field displays the security protocols used for an SA.
Both AH and ESP increase ZyWALL processing requirements and
communications latency (delay).
Refresh Click Refresh to display the current active VPN connection(s).
Disconnect Select a security association index number that you want to disconnect and then
click Disconnect.