Finisar Surveyor - Manual (Page 254)

10-50
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.