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Date:      Thu, 15 Feb 2001 14:20:08 -0800 (PST)
From:      "Young, Jason" <Jason.Young@anheuser-busch.com>
To:        freebsd-bugs@FreeBSD.org
Subject:   Re: kern/24811: Networking in FreeBSD 4.2-RELEASE doesn't allow f ull-duplex<->half-duplex communication
Message-ID:  <200102152220.f1FMK8Z86120@freefall.freebsd.org>

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The following reply was made to PR kern/24811; it has been noted by GNATS.

From: "Young, Jason" <Jason.Young@anheuser-busch.com>
To: "'freebsd-gnats-submit@FreeBSD.org'" <freebsd-gnats-submit@FreeBSD.org>,
	"'klui@cup.hp.com'" <klui@cup.hp.com>
Cc:  
Subject: Re: kern/24811: Networking in FreeBSD 4.2-RELEASE doesn't allow f
	ull-duplex<->half-duplex communication
Date: Thu, 15 Feb 2001 12:05:22 -0600

 If there's a duplex mismatch, your symptoms would seem to indicate it would have
 to be on your work machine, between it and your switch. You have proven (with
 the transfer from the HPUX machine to your home machine) that your home machine
 has reasonable connectivity.
 
 This could definitely be caused by the OS upgrade, since it seems that the
 driver plays a very large role in speed and duplex negotiations and you've
 changed drivers.
 
 You haven't mentioned how you know that link is 10BaseT full-duplex. Is this an
 assumption, or have you set it on the switch personally or otherwise know it's
 supposed to be full-duplex? You could quickly check if this is the problem by
 doing this:
 
   ifconfig pcn0 media 10BaseT mediaopt half-duplex
 
 Then test your connectivity again. If that fixes things, the switch wasn't
 really giving you full duplex connectivity. If the switch is set to
 autonegotiate duplex settings, be aware this tends to fail a lot and you'll
 probably need to force the setting to be whichever way you want it or stay half
 duplex.
 
 If autonegotiation worked before in 3.2-RELEASE with the same hardware with the
 lnc driver, you may want to send a (very, very, very, very) detailed bug report
 to Bill Paul (wpaul@freebsd.org), who maintains that driver.
 
 Jason Young
 CNS - Network Design, Anheuser-Busch
 (314)577-4597
 
 
 


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