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drop.frag_error contains the number of IP datagrams dropped by
interface ip-interface because of its inability to fragment a
datagram. ip-interface forwards datagrams up to 1500 bytes in
length; longer datagrams must be fragmented. Should the datagram
originator forbid fragmenting (by setting the DF bit--Do Not Fragment--
in the IP header), interface ip-address drops the datagram, incre-
ments this counter, and issues an Internet Control Message Protocol
(ICMP) destination unreachable message.
drop.header_format contains the number of IP datagrams dropped
by interface ip-address because of an unparsable or corrupt IP
header.
drop.reassembly_busy contains the number of IP datagrams
dropped by interface ip-interface because of the lack of resources
at the message destination.
drop.ttl_exceeded contains the number of IP datagrams dropped
by interface ip-interface because the IP header Time field had
reached 0.
drop.xsumerror contains the number of IP datagrams dropped by
interface ip-interface because of a faulty IP header checksum.
icmp_rx.dest_unreachable contains the number of ICMP
destination unreachable messages received by interface ip-address.
Such messages indicate that the originating node cannot route or deliver
datagrams.
icmp_rx.echo_request contains the number of ICMP echo request
messages received by interface ip-address. Such messages test
whether a destination node is reachable.
icmp_rx.frag_error contains the number of ICMP destination
unreachable messages with a Code field value of 4 (indicating that a
datagram could not be fragmented) received by interface ip-address.
Such messages indicate that an IP datagram previously routed through
interface ip-address cannot be handled by a subsequent router.
icmp_rx.param_problem contains the number of ICMP parameter
problem messages received by interface ip-address. Such messages
report faulty IP datagram headers.
Managment
Information Base
18
Management Information Base Variables
ip: IP Information Base
18-65