At 10:36 AM 6/8/01, Sites, Bob wrote:
>I know that with any ethernet network retransmissions are normal, but can
>anyone tell me a ballpark figure of what is acceptable. Using our sniffer
>we are seeing approximately 30% of our network traffic as retransmissions?
The retransmissions that Expert Sniffer reports have nothing to do with
Ethernet. They are upper-layer retransmissions, most likely TCP. 30% of
your traffic should not be retransmissions. I'm hesitant go give a
threshold because, networks are all so different, but I guess I would put
it down near 5% if pushed. If you give us more info, we could maybe help
you troubleshoot. A few things to look for:
With your Sniffer isolate which sessions are experiencing the problem.
Consider where the traffic is coming from and going to. Where along the
path could it get dropped? Is it all to one server? Is that server
overwhelmed? Do some troubleshooting at the server (check CPU usage,
buffers, HD space, etc.)
If it's not all to one server, is it all through one path? Are you
oversubscribing some links? For example, you might have a high-speed LAN
that's feeding lots of data into a low-speed WAN. Do some troubleshooting
at the routers or switches in the path. Are they dropping frames?
Good luck. Let us know what you find out! Thanks.
Priscilla
>Bob Sites
>System Engineer, CCNA
>Valley Health System, IS Dept.
>[EMAIL PROTECTED]
>
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Priscilla Oppenheimer
http://www.priscilla.com
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