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Re: scp and packet loss

 John Boland wrote: 
> I had a similar problem that we tracked down to a duplex mismatch 
> between all of the switch/router/firewall uplink ports and the server. 
> basically, auto-negotiate is NOT your friend! 

A couple weeks ago I had an unrelated performance problem when putting a new 
server online, and dope-slapped myself for not remembering to check duplex 
mismatch.  (A port was set to 100/full, the server autonegotiated incorrectly 
to 100/half when I expected 1000/full.) 

But this one is a lot more obscure than that.  As the first responder pointed 
out, the first question is why TCP wouldn't correct the problem--hence there 
is a 99.999% chance this has to be at protocol layer 4 or above, not inside 
the network.  (The online backup vendor has yet to figure that one out...) 

A mismatched duplex problem won't cause applications to completely fail, but 
run slower than expected. 


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