Finisar Surveyor manual Icmp Destination Host Unknown

Expert Features 10

Network Layer

ICMP Destination Host Unknown

Counter

ICMP Destination Host Unknown events are counted in the ICMP All Errors and the ICMP Destination Unreachable counters. A count of all destination unreachable ICMP symptoms and a count of all ICMP errors displays in the Overview counters of Expert View. A threshold can be set in Expert Alarms for all destination unreachable ICMP errors or for all ICMP errors.

Expert Symptom

ICMP Destination Host Unknown events are automatically logged as expert symptoms. The Symptom Summary field provides information about the IP addresses involved. For example:

[206.250.228.69] cannot be reached by [206.250.228.11].

SA=[206.250.228.11] DA=[206.250.228.69]

Diagnostic Details

__________________________________________________________________

Problem Description:

An ICMP Destination Host Unknown message has been sent.

__________________________________________________________________

Probable Cause(s):

1.If a router has a routing table problem, it may send this message.

2.A router may send this message if it does not know the destination host.

3.The source may have an incorrectly configured subnet mask.

__________________________________________________________________

Recommended Action(s):

1.Check the routing tables of the router that this message was generated from.

2.Check the netmask configuration of the source and/or the router.

3.Ignore this message if the host is truly unknown (no action required).

10-65