I need monitoring vpn tunnel

How to do it?

I discovered host in my WatchGuard X505 5 series

but it is not in Vendor, Type for my device

There are 2 firewalls between our offices connect by VPN tunnel (WatchGuard X505 5 series). Ive find MIBs

Standard MIBs are definitions of network and hardware events used by many different devices. Your Firebox or XTM device supports these eight standard MIBs:

• IP-MIB
• IF-MIB
• TCP-MIB
• UDP-MIB
• SNMPv2-MIB
• SNMPv2-SMI
• RFC1213-MIB
• RFC1155 SMI-MIB

These MIBs include information about standard network information, such as IP addresses and network interface settings.

Enterprise MIBs

Enterprise MIBs are used to give information about events that are specific to a single manufacturer. Your Firebox or XTM device supports these enterprise MIBs:

• WATCHGUARD-PRODUCTS-MIB
• WATCHGUARD-SYSTEM-CONFIG-MIB
• UCD-SNMP-MIB for this devices to monitoring its but Im not understand how to add manually to add performance monitors.

__

you can see: http://www.watchguard.com/help/docs/wsm/11/en-US/index_Left.html#CSHID=en-US%2Fbasicadmin%2Fsnmp_about_c.html|StartTopic=Content%2Fen-US%2Fbasicadmin%2Fsnmp_about_c.html|SkinName=WSM%20%28en-US%29

I doesnt find required MIB

__