Part 1 of ICMP Message Handling described the ICMP defined message types supported in NerveCenter.  Part 2 covers the ICMP responses that can be received by NerveCenter.

Today we cover the possible ICMP replies returned by devices as the result of an ICMP or SNMP poll attempt.  The context of the traffic issued by the management application defines the range of potential ICMP replies.

ICMP response provides a means of outcome reporting for a number of scenarios:

• Routing to the the intended destination cannot be carried out.
• The request contains some element which prevents its delivery. (ex: its TTL parameter is too low, making it incapable of reaching the destination)
• An administrative prohibition has been placed at some point(s) of the network that the poll attempt to traverse.
• The destination is reachable but cannot handle the request.

Download the Whitepaper NerveCenter ICMP Messages (pdf) to learn more about the ICMP message types returned during SNMP Polling.