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Chapter 4 Create Secure Connections Across the Internet
ZyWALL USG 20-2000 User’s Guide
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If you have the Configuration > VPN > IPSec VPN > VPN Connection screen’s Use Policy
Route to control dynamic IPSec rules option enabled and the VPN connection is up but VPN
traffic cannot be transmitted through the VPN tunnel, check the routing policies to see if they are
sending traffic elsewhere instead of through the VPN tunnels.
4.2 VPN Concentrator Example
A VPN concentrator uses hub-and-spoke VPN topology to combine multiple IPSec VPN connections
into one secure network. The hub routes VPN traffic between the spoke routers and itself. This
reduces the number of VPN connections to set up and maintain. Here a VPN concentrator connects
ZLD-based ZyWALLs at headquarters (HQ) and branch offices A and B in one secure network.
Branch A’s ZyWALL uses one VPN rule to access both the headquarters (HQ) network and branch
B’s network.
Branch B’s ZyWALL uses one VPN rule to access branch As network only. Branch B is not
permitted to access the headquarters network.
Figure 29 IPSec VPN Concentrator Example
This IPSec VPN concentrator example uses the following settings.
Branch Office A
VPN Gateway (VPN Tunnel 1):
My Address: 10.0.0.2
Peer Gateway Address: 10.0.0.1
VPN Connection (VPN Tunnel 1):
Local Policy: 192.168.11.0/255.255.255.0
Remote Policy: 192.168.1.0/255.255.255.0
Disable Policy Enforcement
Policy Route
Source: 192.168.11.0
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