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From: Ed H. on 16 Apr 2010 18:19
Hi All,

Due to users complaining about a slow network I checked the network traffic
an utilization.
What strikes my attention is that almost 2/3 of the network traffic to our
Terminal Servers is TCP retransmissions.

My question is what you guys think of this. Is this normal or do I have a
malfunctioning switch somewhere or a faulting NIC?

any thoughts and help is very much appreciated.

Ed
From: jolteroli on 17 Apr 2010 05:23
for any sent packed, the receiver acks this by an ack packet. if a packet
gets lost or the ack gets lost after the ack-timer times out, the sender
cant push the chunk and retransmits the lost packet(s) again.

usually this indicates packet-loss on the wire from A to B. the reason is
usually the hardware, slow routers might also be a problem because the drop
packets on resource-exhause. u will (should) then see icmp 11/1 (reassemble
timout) or 4 (source quench) from the router back to the sender.

if you use a hub instead of a switch, collisions are natural and hence
retransmissions too.

exchange patch cables, use another fibre pair, change nics and try another
switch.

-jolt


"Ed H." <ehaaksma(a)aim.com> schrieb im Newsbeitrag
news:Xns9D5D35EB6D3Eehaaksmastergmailcom(a)212.54.40.12...
> Hi All,
>
> Due to users complaining about a slow network I checked the network
> traffic
> an utilization.
> What strikes my attention is that almost 2/3 of the network traffic to our
> Terminal Servers is TCP retransmissions.
>
> My question is what you guys think of this. Is this normal or do I have a
> malfunctioning switch somewhere or a faulting NIC?
>
> any thoughts and help is very much appreciated.
>
> Ed


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