This object indicates the error packet number. For
packet-oriented interfaces, the number of inbound packets that
contained errors preventing them from being deliverable to a
higher-layer protocol. For character-oriented or fixed-length
interfaces, the number of inbound transmission units that
contained errors preventing them from being deliverable to
a higher-layer protocol.
Discontinuities in the value of this counter can occur at
re-initialization of the management system, and at other
times as indicated by the value of
ifCounterDiscontinuityTime.