The type of network address contained in
getClientAddress. '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
getClientAddressType does not accompany
getClientAddress in a set request, the default type
is 'ip'. Corresponds indirectly to the address
value labeled 'Get Client n:' in the SERVER INTERNET
SNMP CHARACTERISTICS display.