WatchGuard Technologies Firebox SOHO 6.1 ユーザーズマニュアル

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User Guide
87
Frequently Asked Questions
Special Considerations
Consider the following before configuring your WatchGuard 
SOHO 6 VPN network:
• You can connect up to six SOHO 6 appliances together. To set 
up more VPN tunnels, you need at least one WatchGuard 
Firebox II/III configured with the WatchGuard VPN 
Manager.
• Each appliance must be able to send messages to the other. If 
either appliance has a dynamically assigned IP address (see 
“Network addressing” on page 31 for an explanation of 
dynamic IP addresses), that appliance cannot find its remote 
counterpart.
• Both appliances must use the same encryption method. The 
two choices are DES or 3DES. When connecting two 
Microsoft Windows NT
®
 networks, the two networks must 
be in the same Microsoft Windows domain or be trusted 
domains. This is a Microsoft Networking design 
implementation and not a limitation of the SOHO 6.
Frequently Asked Questions
Why do I need a static external address? 
To create a VPN connection, one SOHO 6 must be able to find its 
partner appliance. If the addresses are allowed to change, the 
SOHO 6 will not find its remote computer.
How do I get a static external IP address?
Contact your ISP. Many systems use dynamically assigned 
addresses to simplify basic installations. Some providers also use