Specifications

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VPN 3000 Series Concentrator Reference Volume II: Administration and Monitoring
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Chapter 15 Statistics
Monitoring | Statistics | MIB-II | ICMP
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.
Address Mask Requests Received / Transmitted
The number of ICMP Address Mask Request messages received / sent. Address Mask Request messages
ask for the address (subnet) mask for the LAN to which a router connects.
Address Mask Replies Received / Transmitted
The number of ICMP Address Mask Reply messages received / sent. Address Mask Reply messages
respond to Address Mask Request messages by supplying the address (subnet) mask for the LAN to
which a router connects.