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Segment Retransmitted

Posted on 2004-09-21
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Last Modified: 2008-02-01
Hello There.

When doing a netstat-s

How many segment retransmitted is too many - is it 4 percent of segments sent?

What is the best way to trace these retransmissions - using a smiffer ? How easy is this to do?

Thanks
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Question by:halcyone
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8 Comments
 
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Expert Comment

by:crissand
ID: 12112820
If it's a LAN is bad, it must be around 0. If it's in Internet it's good, can be between 5 and 30 percent. The retransmission of a segment is done when your computer (the sender) does'n't receive the acq signal in time. You can use netdiag for a more comprehensive diagnostic of your network.
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Author Comment

by:halcyone
ID: 12142914

PC's communicating between WANS have the following stats after being rebooted  on Friday  and not connecting to the internet - what the easiest way to find out the cause?
 
Tuesday Morning:
192.168.74.5                13214014 sent      70780 retrans             0.5%
192.168.74.6                13393823 sent    327973 retrans             2.4%
192.168.74.8                  9872540 sent      43062 retrans             0.4%
192.168.74.14              12113122 sent      81588 retrans             0.7%
192.168.74.28               3144063 sent       42137 retrans             2.4%
 
Thursday Morning:
192.168.74.5                 23047639 sent       178366 retrans             0.8%
192.168.74.6                 20335236 sent       759408 retrans             3.7%
192.168.74.8                  16368667sent         97540 retrans             0.6%
192.168.74.14                19401001sent        181531retrans             0.9%
192.168.74.28                 9432007 sent       113058 retrans             1.1%
 

192.168.74.6                 28879828 sent       828394 retrans             2.8%
 
thanks
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Author Comment

by:halcyone
ID: 12142963
Is it possible that some router settings like using cisco WFQ methods instead of FIFO could cause this ?

Thanks
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LVL 18

Expert Comment

by:crissand
ID: 12143035
As you can see there are two computers that requires retransmission, the one with over 1% retries. There are a lot of tests that can be done, but the best one is using a quality metter. You can try diagnosing by changing port in switch, replacing cables. If the two computers are not the same as others (less powerful processor, less memory, another O/S) or if they are loaded with software which use a lot of processor time, this can be an answer.

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Expert Comment

by:crissand
ID: 12143216
Cisco WFQ e slower than FIFO, because is a protection against burst flow. Can be.
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Author Comment

by:halcyone
ID: 12154105
Thanks guys,

 -what is a quality meter? And how is it used to test for retransmissions ?

- what ways are there of tracking the cause of retransmission exactly.

thanks
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LVL 18

Accepted Solution

by:
crissand earned 250 total points
ID: 12159715
The qualitty metters are different hardware tools to verify the quality of a network cabling. I don't know the commercial name of such a tool, but I've seen some functionning: the reports about the cabling quality was very detailed. You can see a sample here: http://www.computerweekly.com/Article111088.htm.

Software monitoring tools.
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Author Comment

by:halcyone
ID: 12346024
thanks for your input
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