Monitor | Statistics | MIB-II | ICMP
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VPN 3000 Concentrator Series User Guide
Time Exceeded Received / Transmitted
The number of ICMP Time Exceeded messages received / sent. Time Exceeded messages indicate that
the lifetime of the packet has expired, or that a router cannot reassemble a packet within a time limit.
Parameter Problems Received / Transmitted
The number of ICMP Parameter Problem messages received / sent. Parameter Problem messages
indicate a syntactic or semantic error in an IP header.
Source Quench Received / Transmitted
The number of ICMP Source Quench messages received / sent. Source Quench messages provide
rudimentary flow control; they request a reduction in the rate of sending traffic on the network.
Redirects Received / Transmitted
The number of ICMP Redirect messages received / sent. Redirect messages advise that there is a better
route to a particular destination.
Echo Requests (PINGs) Received / Transmitted
The number of ICMP Echo (request) messages received / sent. Echo messages are probably the most
visible ICMP messages. They test the communication path between network entities by asking for Echo
Reply response messages.
Echo Replies (PINGs) Received / Transmitted
The number of ICMP Echo Reply messages received / sent. Echo Reply messages are sent in response
to Echo messages, to test the communication path between network entities.
Timestamp Requests Received / Transmitted
The number of ICMP Timestamp (request) messages received / sent. Timestamp messages measure the
propagation delay between network entities by including the originating time in the message, and asking
for the receipt time in a Timestamp Reply message.
Timestamp Replies Received / Transmitted
The number of ICMP Timestamp Reply messages received / sent. Timestamp Reply messages are sent
in response to Timestamp messages, to measure propagation delay in the network.
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