WatchGuard Technologies WatchGuard SOHO and SOHO | tc ユーザーズマニュアル

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What you will need
44
encrypted Internet connection, a VPN connection eliminates any 
significant risk of data being read or altered by outside users as it 
traverses the Internet.
What you will need
1
One WatchGuard SOHO with VPN and an IPSec-compliant 
device.
While you can create a SOHO to SOHO VPN, you can also create a VPN 
with a WatchGuard Firebox or other IPSec-compliant devices.
2
The following information from your Internet service provider 
for both devices:
 - Static IP address
 - Default gateway address
 - Primary domain name service (DNS) IP address
 - If available, a secondary DNS address
 - Domain name
3
Network addresses and subnet mask for networks. By default, 
the Private, network address of the SOHO is 192.168.111.0 and 
the subnet mask is 255.255.255.0. 
  N
OTE
The internal networks on either end of the VPN tunnel must use different  
network addresses.
To create an IPSec tunnel between devices you must add 
information to the configuration files of each that is specific to the 
site, such as public and private IP addresses. It is imperative to 
keep these addresses straight. WatchGuard recommends making a 
table of IP addresses such as the one outlined below.