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ICMP Overview window 205
Models 2616RC, 3096RC & 3196RC Admin Reference Guide 12 • IP (IP, TCP, UDP, & ICMP)
• The port on the host is unavailable; a specified source route failed
• A packet must be fragmented (that is, broken up into two or more packets) but the packet was sent anyway
with instructions not to be fragmented.
Times Exceeded (icmpInTimeExcds, icmpOutTimeExcds)
The number of ICMP time exceeded messages received/sent. Each time a packet passes through a gateway, that
gateway reduces the time-to-live (TTL) field by one. The default starting number is defined under the IP sec-
tion. If the gateway processing a packet finds that the TTL field is zero it will discard the packet and send the
ICMP time exceeded message. Time exceeded will also be incremented when a host which is reassembling a
fragmented packet cannot complete the reassembly due to missing packets within its time limit. In this case,
ICMP will discard the packet and send the time exceeded message.
Parameter Problems (icmpInParmProbs, icmpOutParmProbs)
The number of ICMP parameter problem messages received/sent. If while processing a packet, a gateway or
host finds a problem with one or more of the IP header parameters which prohibits further processing, the gat-
way or host will discard the packet and return an ICMP parameter problem message. One potential source of
this problem may be with incorrect or invalid arguments in an option. ICMP sends the parameter problems
message if the gateway or host has discarded the whole packet.
Source Quenchs (icmpInSrcQuenchs, icmpOutSrcQuenchs)
The number of ICMP source quench messages received/sent. A gateway will discard packets if it cannot allo-
cate the resources, such as buffer space, to process the packet. If a gateway discards the packet, it will send an
ICMP source quench message back to the sending device. A host may send this messages if packets arrive too
fast to be processed or if there is network congestion. The source quench message is a request to reduce the rate
at which the source is sending traffic. If the T-DAC receives a source quench, it will wait for acknowledgement
of all outstanding packets before sending more packets to the remote destination. Then it will begin sending
out packets at an increasing rate until the connection is restored to standard operating conditions.
Redirects (icmpInRedirects, icmpOutRedirects)
The number of ICMP redirect messages received/sent. A gateway sends a redirect message to a host if the net-
work gateways find a shorter route to the destination through another gateway.
Echos (icmpInEchos, icmpOutEchos)
The number of ICMP echo request messages received/send. The ICMP echo is used whenever one uses the
diagnostic tool ping. Ping is used to test connectivity with a remote host by sending regular ICMP echo
request packets and then waiting for a reply. Received echos (icmpInEchos) will increment when the T-DAC
is pinged.
Echo Replys (icmpInEchoReps, icmpOutEchoReps)
The number of ICMP echo reply messages received/sent. An echo reply is a response to an echo request. Send
echos (icmpOutEchos) will increment when the T-DAC sends an echo reply message in response to a ping.
Time Stamps (icmpInTimestamps, icmpInTimestamps)
The number of ICMP time stamp messages received/sent. Time stamp and time stamp replies were originally
designed into the ICMP facility to allow network clock synchronization. Subsequently, a new protocol—Net-
work time protocol (NTP) has taken over this function. Normally, this number will be zero.