Fortinet MR1 - Manual (Page 521)

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that this counter would include datagrams counted in ipForwDatagrams if any such packets met this
(discretionary) discard criterion.
IpNoRoutes - 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 ipForwDatagrams
which meet this `no-route' criterion. Note that this includes any datagrams which a host cannot route
because all of its default gateways are down.
IpReasmTimeout - The maximum number of seconds which received fragments are held while they
are awaiting reassembly at this entity.
IpReasmReqds - The number of IP fragments received which needed to be reassembled at this entity.
IpReasmOKs - The number of IP datagrams successfully re-assembled.
IpReasmFails - The number of failures detected by the IP re-assembly algorithm (for whatever reason:
timed out, errors, etc). Note that this is not necessarily a count of discarded IP fragments since some
algorithms can lose track of the number of fragments by combining them as they are received.
IpFragOKs - The number of IP datagrams that have been successfully fragmented at this entity.
IpFragFails - The number of IP datagrams that have been discarded because they needed to be
fragmented at this entity but could not be, e.g., because their Don't Fragment flag was set.
IpFragCreates - The number of IP datagram fragments that have been generated as a result of
fragmentation at this entity.
IpRoutingDiscards - The number of routing entries which were chosen to be discarded even though
they are valid. One possible reason for discarding such an entry could be to free-up buffer space for
other routing entries.
IcmpInMsgs - The total number of ICMP messages which the entity received. Note that this counter
includes all those counted by icmpInErrors.
IcmpInErrors - The number of ICMP messages which the entity received but determined as having
ICMP-specific errors (bad ICMP checksums, bad length, etc.).
IcmpInDestUnreachs - The number of ICMP Destination Unreachable messages received.
IcmpInTimeExcds - The number of ICMP Time Exceeded messages received.
IcmpInParmProbs - The number of ICMP Parameter Problem messages received.
IcmpInSrcQuenchs - The number of ICMP Source Quench messages received.
IcmpInRedirects - The number of ICMP Redirect messages received.
IcmpInEchos - The number of ICMP Echo (request) messages received.
IcmpInEchoReps - The number of ICMP Echo Reply messages received.
IcmpInTimestamps - The number of ICMP Timestamp (request) messages received.