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Cisco Bug: CSCuw36228 - Incorrect tagging of TTL value in the EDR records

Last Modified

May 22, 2017

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

18.3.a0.61024 19.2.d0 20.0.0 20.0.v0

Description (partial)

Symptom:
Mismatch between TTL value in TCP OS signature field and the IP TTL value populated in EDR records
causing incorrect tethering detection.

Conditions:
When both IP TTL and TCP OS signature is enabled in EDR 

Following configuration is required in edr-format:

<i>edr-format xxx</i>
<i>rule-variable flow ttl priority 1</i>
<i>rule-variable tcp os-signature priority 2</i>
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