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TCP Out-Of-Order

Posted on 2010-11-09
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People are complaining about the performance of the LAN. As I monitored the network with wireshark I found alot of Out-Of-Order TCP packets. But not just from one source but from many sources to different destinations. Could this be the problem? Could it be the switch? Need some help debugging. Switch is cisco catalyst 2980G
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Question by:socom1985
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jsd9 earned 2000 total points
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Most performance issues on a switched network indicate a speed/duplex mismatch.  I see you have a Gigabit switch, however some of your connections may be Fast Ethernet.  If you have a Fast Ethernet connections, I would recommend that you look to see if you are using auto-negotiation.  Auto-negotiation on Fast Ethernet does not work well in most situations.  If you are able to login to the switch and look at the port counters, see if there are any interface errors.  I always recommend to my customers to hard code their Fast Ethernet connections to 100 Full duplex, as auto-negotiation on Fast Ethernet can often cause performance issues with dropped traffic.  This is both on the switch side and the connecting device side.  
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by:socom1985
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That was the problem. Thanks..
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