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Posted by on December 26, 2006, 10:39 am
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glnsk8ter wrote:
> I am trying to diagnose a slow email issue from various office scanners that
> can perform scan to email from their control panel, used to work fine now
> their is an intermittent situation where scan a page once, goes fine, rescan
> it again and it may take minutes or hours. local email server. I have a
> packet capture, but I just noticed there doesn't seem to be a way to attach
> it.
>
> I see
> sections where
> a previous segment loss message from is sent from scanner.
> then an awk from email server
> then some packets of message body (varies from 3 to 7)
> then duplicate awk packets equal in quanity to the number of message body
> packet sent.
> then a single fast retransimission of message body from scanner is sent to
> email server
> then more packets without any issues, then then the whole set of messages
> above again.
In a modern ethernet network the most likely cause is
a duplex missmatch.
Set everything to auto speed/auto duplex and try again.
Check all interfaces for hardware layer errors CRC, align/frame,
short.
If you have unmanaged network equipment check the end stations.
"netstat -e" works sometimes - If that doesn't identify the issue
get managed network equipment or randomly change things
until it goes away.
Second most likely is bad cable or NIC.
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