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Expert Features
Network Layer
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ICMP Host Redirect for TOS
Counter
ICMP Host Redirect for TOS events are counted in the ICMP Redirect Errors
counter and the ICMP All Errors counter. A count of ICMP redirect errors 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 ICMP redirect errors or for all ICMP
errors.
Expert Symptom
ICMP Host Redirect for TOS events are automatically logged as expert symptoms.
The
Symptom Summary field provides information about the IP addresses involved.
For example:
Use Gateway [206.250.54.61] to reach [206.250.228.69] and
TOS 22 from [206.250.228.11]. SA=[206.250.228.11]
DA=[206.250.228.69]
Diagnostic Details
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Problem Description:
An ICMP Redirect for TOS and Host 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 router may send this message if according to its (proper) routing tables it finds a
shorter path via a different router.
3. The source may have an incorrectly configured subnet mask.
4. The host (source) may have an old routing table.
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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 redirect message is valid (no action required).