ZyXEL Communications ZyWALL 2 Plus - Manual (Page 289)

Chapter 14 IPSec VPN
ZyWALL 2 Plus User’s Guide
289
14.15 Telecommuter VPN/IPSec Examples
The following examples show how multiple telecommuters can make VPN connections to a
single ZyWALL at headquarters. The telecommuters use IPSec routers with dynamic WAN IP
addresses. The ZyWALL at headquarters has a static public IP address.
14.15.1 Telecommuters Sharing One VPN Rule Example
See the following figure and table for an example configuration that allows multiple
telecommuters (A, B and C in the figure) to use one VPN rule to simultaneously access a
ZyWALL at headquarters (HQ in the figure). The telecommuters do not have domain names
mapped to the WAN IP addresses of their IPSec routers. The telecommuters must all use the
same IPSec parameters but the local IP addresses (or ranges of addresses) should not overlap.
Figure 190 Telecommuters Sharing One VPN Rule Example
Local and Remote IP
Address Conflict
Resolution
Select The Local Network to send packets destined for overlapping local
and remote IP addresses to the local network (you can access the local
devices but not the remote devices).
Select The Remote Network (via VPN Tunnel) to send packets destined for
overlapping local and remote IP addresses to the remote network (you can
access the remote devices but not the local devices.)
If the remote IPSec router also supports NAT over IPSec, it is recommended
that you use NAT over IPSec (see Section 14.6.2 on page 271 ) if the local
and remote IP addresses overlap.
If a VPN rule’s local and remote network settings are both set to 0.0.0.0
(any), no traffic goes through the VPN tunnel if you select The Local
Network.
Apply Click Apply to save your changes back to the ZyWALL.
Reset Click Reset to begin configuring this screen afresh.
Table 74 SECURITY > VPN > Global Setting (continued)
LABEL DESCRIPTION