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Virtual Private Networking
101
 N600 Wireless Dual Band Gigabit ADSL2+ Modem Router DGND3700
Note:  
While your PC is connected to a remote LAN through a VPN, you 
might not have normal Internet access. If this is the case, you have 
to close the VPN connection to have normal Internet access.
Set Up a Gateway-to-Gateway VPN Configuration
Note:  
This section describes how to use the VPN Wizard to set up the 
VPN tunnel using the VPNC default parameters listed in 
page 89. If you have special requirements not covered by these 
VPNC-recommended parameters, see 
on page 111 for information about how to set 
up the VPN tunnel.
Follow this procedure to configure a gateway-to-gateway VPN tunnel using the VPN Wizard. 
VPN tunnel
Internet
IP: 192.168.0.1
IP:192.168.3.1
Gateway B
Gateway A
22.23.24.25
14.15.16.17
Figure 45. Gateway-to-gateway VPN tunnel
Set the LAN IPs on each wireless modem router to different subnets and configure each 
correctly for the Internet. The subsequent examples assume the settings shown in the 
following table.
Table 18.  Gateway-to-gateway VPN tunnel configuration worksheet  
Parameter
Value to Be Entered Field Selection
Connection Name
GtoGr
N/A
Pre-Shared Key
12345678
N/A
Secure Association
N/A
Main Mode
Manual Keys
Perfect Forward Secrecy
N/A
Enabled
Disabled
Encryption Protocol
N/A
DES
3DES