Watchguard Firebox X1000, Reference Manual

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CHAPTER 10: Field Definitions
232 WatchGuard Firebox System
Encryption tab
RC4 (40-bit)
Click to enable 40-bit encryption between two WatchGuard
Fireboxes using the WatchGuard VPN protocol.
RC4 (128-bit)
Click to enable stronger, 128-bit encryption between two
WatchGuard Fireboxes using the WatchGuard VPN protocol.
Encryption Key
Enter a pass phrase or secret. Click Make a Key to hash the pass
phrase which will appear below. The hashed encryption key must
be identical on both Fireboxes.
If you are running different versions of WatchGuard Firebox
System software, verify that the hashes match exactly on the two
Fireboxes.
Make a Key
Click to hash the key.
Key
Displays the hashed encryption key.
Options tab
Activate WatchGuard VPN
Enable this checkbox to enable WatchGuard VPN protocol.
Without this checkbox enabled, any configuration of tunnels and
remote networks will be ignored by the Firebox.
Add Source to Blocked List When Denied
Enable this checkbox to automatically block sites when the source
fails to properly connect to the Firebox. Failure can be a result of
improper configuration, encryption keys that do not match, or an
attempt to hack the VPN tunnel policy.
Activate Incoming Log
You have the option of logging incoming traffic using
WatchGuard VPN protocol. Activating logging often generates a
high volume of log entries, however, which can significantly slow
the passage of VPN traffic. It is recommended only for debugging
purposes.