Surveyor

User’s Guide

TCP Repeat Ack

Counter

The TCP Repeat Ack counter increments when the TCP acknowledgment number is less than the immediately preceding acknowledgement. A count of all TCP Repeat Ack events displays in the Overview counters of Expert View.

Expert Symptom

TCP Repeat Acks are automatically logged as expert symptoms. The Symptom Summary field indicates that the acknowledgement numbers are out of sequence. For example:

Acknowledgement number is less than the one before

Diagnostic Details

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Problem Description:

A TCP/IP acknowledgement number is less than the one before.

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Probable Cause(s):

1.The network is overloaded.

2.There may be a problem with the sender’s TCP/IP stack.

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Recommended Action(s):

1. Update the sender’s TCP/IP stack.

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Finisar Surveyor manual TCP Repeat Ack, Acknowledgement number is less than the one before