scp and packet loss

[Rich Braun]

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.

-rich


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