The IP multicast group address to which the last invalid
packet was addressed. The type of address stored
depends on the value in cpimLastErrorGroupType.
The value of this object is a zero-length InetAddress if
there is a problem in the packet received from the DR,
for eg. a malformed encapsulated IP header.
The value of this object is irrelevant if the value of
cpimLastErrorType is none(1).