From owner-freebsd-net@FreeBSD.ORG  Wed Dec 15 17:51:12 2010
Return-Path: <owner-freebsd-net@FreeBSD.ORG>
Delivered-To: freebsd-net@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 230E0106564A
	for <freebsd-net@freebsd.org>; Wed, 15 Dec 2010 17:51:12 +0000 (UTC)
	(envelope-from
	mlists+freebsd-net=freebsd-net=freebsd.org=ljksjktw@daemonground.de)
Received: from mail.daemonground.de (mail.daemonground.de
	[IPv6:2a01:4f8:120:84a1::2])
	by mx1.freebsd.org (Postfix) with ESMTP id B390A8FC0A
	for <freebsd-net@freebsd.org>; Wed, 15 Dec 2010 17:51:11 +0000 (UTC)
Received: from oinetka.gfsrv.net ([79.110.95.2] helo=dreamland.office.local)
	by mail.daemonground.de with esmtpsa (TLSv1:AES256-SHA:256) (Exim)
	(envelope-from <mlists+freebsd-net@daemonground.de>)
	id 1PSvVO-0002JG-TC
	for freebsd-net@freebsd.org; Wed, 15 Dec 2010 18:51:10 +0100
From: Sascha Holzleiter <mlists+freebsd-net@daemonground.de>
To: freebsd-net@freebsd.org
Date: Wed, 15 Dec 2010 18:51:22 +0100
User-Agent: KMail/1.13.5 (FreeBSD/8.1-STABLE; KDE/4.5.3; amd64; ; )
MIME-Version: 1.0
Content-Type: text/plain;
  charset="us-ascii"
Content-Transfer-Encoding: 7bit
Message-Id: <201012151851.22611.mlists+freebsd-net@daemonground.de>
Subject: Forcing Full-Duplex on Realtek card
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-net>
List-Post: <mailto:freebsd-net@freebsd.org>
List-Help: <mailto:freebsd-net-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 15 Dec 2010 17:51:12 -0000

Hello,

i just discovered it seems to be impossible to force a duplex setting if the 
switchport is not doing autonegotiation. 
The server in question has a Realtek 1GBit device but the hosting company
reduces the speed on their switches to 100MBit. So after booting without
any options this gives me:

re0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
	
options=389b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_UCAST,WOL_MCAST,WOL_MAGIC>
	ether XX:XX:XX:XX:XX:XX
	inet 46.X.X.X netmask 0xffffffc0 broadcast 46.X.X.X
	media: Ethernet 100baseTX <half-duplex>
	status: active

I though this wasn't a big deal and tried to force it to full-duplex:

# ifconfig re0 media 100baseTX mediaopt full-duplex

but it seems the actual setting is still half-duplex:

re0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
	
options=389b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_UCAST,WOL_MCAST,WOL_MAGIC>
	ether XX:XX:XX:XX:XX:XX
	inet 46.X.X.X netmask 0xffffffc0 broadcast 46.X.X.X
	media: Ethernet 100baseTX <full-duplex> (100baseTX <half-duplex>)
	status: active

This is on a FreeBSD 8.1-RELEASE amd64 system and the hardware in questions 
is:

re0@pci0:6:0:0:	class=0x020000 card=0x75221462 chip=0x816810ec rev=0x02 
hdr=0x00
    vendor     = 'Realtek Semiconductor'
    device     = 'Gigabit Ethernet NIC(NDIS 6.0) (RTL8168/8111/8111c)'
    class      = network
    subclass   = ethernet

Is there anything i can do to force the full-duplex setting for good?


Regards,
  Sascha