The type of network address contained in
trapClientAddress. 'unknown' means no address has
been defined. 'other' means no other type value
applies. 'ip' is an Internet IP address.
'ethernet' is an 802.3 MAC address. If
trapClientAddressType does not accompany
trapClientAddress in a set request, the default type
is 'ip'. Corresponds indirectly to the address
value labeled 'Trap Client n:' in the SERVER
INTERNET SNMP CHARACTERISTICS display.