Odd network issue ... *very* slow scp between two servers

[Bill Vermillion]

freebsd-stable-request at freebsd.org, the prominent pundit, on Sun,
Mar 07, 2004 at 05:24 while half mumbling, half-witicized:

> ------------------------------
> 
> Message: 11
> Date: Sat, 6 Mar 2004 21:26:14 -0400 (AST)
> From: "Marc G. Fournier" <scrappy at hub.org>
> Subject: Re: Odd network issue ... *very* slow scp between two servers
> To: Mike Tancsa <mike at sentex.net>
> Cc: freebsd-stable at freebsd.org
> Message-ID: <20040306212430.F13247 at ganymede.hub.org>
> Content-Type: TEXT/PLAIN; charset=US-ASCII

> Wow, okay, switching to 10baseT/UTP, full duplex is atrocious too:

> 1038785 bytes received in 74.30 seconds (13.65 KB/s)

> So, bug with full-duplex on the em devices?

> Switching to 100baseTX, half-duplex gives me an error though,
> but seems to work:

I saw something similar when an OS/X machine was having slow
transfers while the BSD's were not.

When I did a traceroute to the adjacent machine which was on a
separate /24 network, the packets went to the switch, to the
router which tne sent it back to the switch, and to the
destination.   I don't know what prompted me to perform a
traceroute between two machines that were on the same switch, but
it was two hops instead of just direct.  There was also an
intervening bridge - post switch / pre router that added delay.

This was on a Cisco 2948.

This may have nothing to do with your problem and you didn't
indicated if the machines were on the same subnet or not.
Just throwing this out as a point of interest.

Bill

-- 
Bill Vermillion - bv @ wjv . com