Finisar Surveyor manual Icmp Host Unreachable for TOS

Expert Features 10

Network Layer

ICMP Host Unreachable for TOS

Counter

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

TOS=22 service on [206.250.228.69] unavailable for

[206.250.228.11]. SA=[206.250.228.11] DA=[206.250.228.69]

Diagnostic Details

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Problem Description:

An ICMP Destination Host is Unreachable for TOS message has been sent.

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Probable Cause(s):

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

2.A host may send this message if a destination host is unreachable for the type of service requested.

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

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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.

3.Ignore this message if the host is truly unreachable for TOS (no action required).

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