3Com LINKBUILDER MSH 4 PORT ETHERNET BRIDGE MODULE Network Hardware User Manual


 
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Viewing UDP Statistics 5-37
destination unreachable:
Display Field. The number of
’destination unreachable’ messages sent (output) and received
(input). When a node receives an IP packet that it cannot forward
to its destination, it sends a ’destination unreachable’ message to
the sending node.
source quench:
Display Field. The number of ’source quench’
messages sent (output) and received (input). A ’source quench’ is
a flow control message that requests a reduction in the rate of
datagram transmission.
routing redirect:
Display Field. The number of ’redirect’
messages sent (output) and received (input). When a node
receives a packet to be forwarded which should have been sent
by a different route, it sends an ICMP ’redirect’ message to the
sending node.
echo:
Display Field. The number of ’echo request’ messages sent
(output) and received (input). ’Echo request’ works in conjunction
with the ’echo reply’.
time exceeded:
Display Field. The number of ’time exceeded’
messages sent (output) and received (input). The ’time exceeded’
message tells a node that a packet it sent was discarded before
reaching its destination, because its ’time-to-live’ timer expired.
parameter problem:
Display Field. The number of ’parameter
problem’ messages sent (output) and received (input). A
’parameter problem’ message tells a node that a packet it sent
was discarded, because it contained an error in an IP header
parameter.
time stamp request:
Display Field. The number of ’time stamp’
messages sent (output) and received (input). A ’time stamp’
message is a request for the value of the receiving node's system
clock.