User's Manual

SPEEDLAN TM
77
Input Discards - The number of input IP datagrams for which no problems were encountered to prevent their
continued processing, but which were discarded anyway (e.g., for lack of buffer space). Note that this counter
does not include any datagrams discarded while awaiting re-assembly.
Deliveries - The total number of input datagrams successfully delivered to IP user-protocols.
Output requests - The total number of IP datagrams which user-protocols (including ICMP) supplied to IP
in-requests for transmission. Note that this counter does not include any datagrams counted in Datagrams
forwarded.
Output discards - The number of output IP datagrams for which no problem was encountered to prevent
their transmission to their destination, but which were discarded anyway (e.g., for lack of buffer space). Note
that this counter would include datagrams counted in Datagrams forwarded if any such packets met this
(discretionary) discard criterion.
Unknown routes - The number of IP datagrams discarded because no route could be found to transmit them
to their destination. Note that this counter includes any packets counted in Datagrams forwarded which meet
this ‘no-route’criterion, as well as any datagrams which a host cannot route because all of its default gateways
are down.
Reassembly timeout - The maximum number of seconds that received fragments are held while they are
awaiting reassembly at this entity.
Reassembly fragments - The number of IP datagrams received which needed to be reassembled at this
entity.
Good Reassemblies - The number of IP datagrams successfully reassembled.
Failed Reassemblies - The number of failures detected by the IP reassembly algorithm (for whatever reason
- timed out, errors, etc.). Note that this is not necessarily a count of discarded IP fragments since some
algorithms (notably the algorithm in RFC 815) can lose track of the number of fragments by combining them as
they are received.
Datagrams fragmented - The number of IP datagrams that have been successfully fragmented at this entity.
Fragment failures - The number of IP-datagram fragments that have been discarded because they needed to
be fragmented at this entity but could not be because the datagram’s “don’t fragment” flag was set.
Fragments created - The number of IP-datagram fragments that have been generated as a result of fragmen-
tation at this entity.
Datagrams forwarded - The number of input datagrams for which this entity was not their final IP destination,
as a result of which an attempt was made to find a route to forward them to that final destination. In entities
which do not act as IP gateways, this counter will include only those packets which were Source-Routed via
this entity, and for which Source-Route option processing was successful.
Routing discards - The number of routing entries which were chosen to be discarded even though they were
valid. One possible reason for discarding such an entry could be to free up buffer space for other routing.