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nic ftp slow 10/100 auto negotiate

From: Jeff Liebermann <jeffl@comix.santa-cruz.ca.us>
Subject: Re: FTP slow xfer SCO OpenServer 5.06?
Date: Sun, 25 May 2003 21:45:41 -0700
References: <8594ba46.0305251125.7c49861d@posting.google.com>
<bar7s6$9r6$1@pcls4.std.com> 

On Sun, 25 May 2003 20:08:38 +0000 (UTC), tony@aplawrence.com wrote:

>http://www.pcunix.com/SCOFAQ/scotec4.html#autonegotiate

Oh-oh.  That's slightly misleading.  There are more modes and
combinations.  See:
  http://scyld.com/expert/NWay.html
for the complete explanation of NWAY.  The order and sequence is:
   1. 100BASE-TX Full Duplex 
   2. 100BASE-T4 Half Duplex
   3. 100BASE-TX Half Duplex
   4. 10BASE-T   Full Duplex 
   5. 10BASE-T   Half Duplex
Negotiation starts at the top and settles to the bottom.  If the NIC
cannot negotiate, you get 10base-T half duplex by default.

Note the 100base-T4 which is where most of the NIC/switch negotiations
get stuck.  There's also a potential screwup as some cards (i.e.
3C905A) will only successfully perform an NWAY negotiation on power
up.  Rebooting doesn't seem to convince it to try again.  Worse, it
may actually be successfully re-negotiating, but forgetting to inform
the OSR5 driver of the change.  Dunno.  I've never bothered to
investigate.


-- 
Jeff Liebermann  150 Felker St #D  Santa Cruz CA 95060
(831)421-6491 pgr  (831)336-2558 home
http://www.LearnByDestroying.com   AE6KS
jeffl@comix.santa-cruz.ca.us   jeffl@cruzio.com

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