From owner-freebsd-questions@FreeBSD.ORG Sun Jun 8 10:33:18 2008 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id BC209106566C for ; Sun, 8 Jun 2008 10:33:18 +0000 (UTC) (envelope-from m.seaman@infracaninophile.co.uk) Received: from smtp.infracaninophile.co.uk (gate6.infracaninophile.co.uk [IPv6:2001:8b0:151:1::1]) by mx1.freebsd.org (Postfix) with ESMTP id C56438FC1A for ; Sun, 8 Jun 2008 10:33:16 +0000 (UTC) (envelope-from m.seaman@infracaninophile.co.uk) Received: from happy-idiot-talk.infracaninophile.co.uk (localhost [IPv6:::1]) (authenticated bits=0) by smtp.infracaninophile.co.uk (8.14.2/8.14.2) with ESMTP id m58ATKdN024513; Sun, 8 Jun 2008 11:29:26 +0100 (BST) (envelope-from m.seaman@infracaninophile.co.uk) X-DKIM: Sendmail DKIM Filter v2.5.5 smtp.infracaninophile.co.uk m58ATKdN024513 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=infracaninophile.co.uk; s=200708; t=1212920967; bh=majxSFjFSHWOnp WAXVCnJdsWXzTOknaoV7iBpt+3R0I=; h=Message-ID:Date:From:MIME-Version: To:CC:Subject:References:In-Reply-To:Content-Type:Cc:Content-Type: Date:From:In-Reply-To:Message-ID:Mime-Version:References:To; z=Mes sage-ID:=20<484BB47A.5050404@infracaninophile.co.uk>|Date:=20Sun,=2 008=20Jun=202008=2011:29:14=20+0100|From:=20Matthew=20Seaman=20|Organization:=20Infracaninophile|User -Agent:=20Thunderbird=202.0.0.14=20(X11/20080607)|MIME-Version:=201 .0|To:=20Erik=20Trulsson=20|CC:=20"Gelsema, =20P=20\(Patrick\)=20-=20FreeBSD"=20,=20=0D=0 A=20Michael=20Toth=20,=0D=0A=20freebsd-q uestions@freebsd.org|Subject:=20Re:=20NFE=20setting=20manually=20to =201000baseT=20and=20half=20duplex|References:=20<56297.82.95.198.1 7.1212870050.squirrel@webmail.superhero.nl>=09<484B1088.6030905@que ldor.net>=09<49343.82.95.198.17.1212917968.squirrel@webmail.superhe ro.nl>=20<20080608095628.GA34267@owl.midgard.homeip.net>|In-Reply-T o:=20<20080608095628.GA34267@owl.midgard.homeip.net>|X-Enigmail-Ver sion:=200.95.6|Content-Type:=20multipart/signed=3B=20micalg=3Dpgp-s ha256=3B=0D=0A=20protocol=3D"application/pgp-signature"=3B=0D=0A=20 boundary=3D"------------enigE2F79AE540E1C200B2371BB7"; b=MkJi+2cEzg YgMFdaVHJc43RuFO8rxwGUlEuwNqsj1uZPvd1gxebjYPlhZExcfC8wreES6T0Y1DL9p JfLYOvcNM7v6J2bVieQsxUeCogUMVWebiz3vT2g4oqus+OIp2JxYNLJ3HRtrLCl2tfC 0UEA8ZWogYQF9ogWq1LRMmlvtDo= Message-ID: <484BB47A.5050404@infracaninophile.co.uk> Date: Sun, 08 Jun 2008 11:29:14 +0100 From: Matthew Seaman Organization: Infracaninophile User-Agent: Thunderbird 2.0.0.14 (X11/20080607) MIME-Version: 1.0 To: Erik Trulsson References: <56297.82.95.198.17.1212870050.squirrel@webmail.superhero.nl> <484B1088.6030905@queldor.net> <49343.82.95.198.17.1212917968.squirrel@webmail.superhero.nl> <20080608095628.GA34267@owl.midgard.homeip.net> In-Reply-To: <20080608095628.GA34267@owl.midgard.homeip.net> X-Enigmail-Version: 0.95.6 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------enigE2F79AE540E1C200B2371BB7" X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.0 (smtp.infracaninophile.co.uk [IPv6:::1]); Sun, 08 Jun 2008 11:29:27 +0100 (BST) X-Virus-Scanned: ClamAV version 0.93, clamav-milter version 0.93 on happy-idiot-talk.infracaninophile.co.uk X-Virus-Status: Clean Cc: Michael Toth , "Gelsema, P \(Patrick\) - FreeBSD" , freebsd-questions@freebsd.org Subject: Re: NFE setting manually to 1000baseT and half duplex X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 08 Jun 2008 10:33:18 -0000 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigE2F79AE540E1C200B2371BB7 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable Erik Trulsson wrote: > (IIRC a switch or NIC that is set to auto-negotiate, but where the > negotiation fails (possibly because the other end is not set to > auto-negotiate) will usually revert to 10Mbps/half-duplex, i.e. the > original, slowest, Ethernet speed.) 100Mb half-duplex is the default setting in this sort of mismatch. It will 'sort of' work, but you'll find performance is terrible and there will be significant amounts of packet loss. Note too that 1Gb speeds require both sides to be set to autonegotiate -- it's part of the standard for supporting those speeds, so that in the event of transmission difficulties the connection can be gracefully degraded rather than just ceasing to work at all. There's a lot of received wisdom around that wiring down connection speeds is a good idea. That may have been the case 5 or more years ago, when there were certainly some combinations of NIC / network switch manufacturer that just wouldn't negotiate correctly, but now that=20 1Gb/s capability is pretty much standard such incompatibilities are rare. Nowadays, for best results, auto-negotiate. Cheers, Matthew --=20 Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard Flat 3 PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate Kent, CT11 9PW --------------enigE2F79AE540E1C200B2371BB7 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.9 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEAREIAAYFAkhLtIAACgkQ8Mjk52CukIwLxACcDfyBNivjfLAPecO3tKSDIT4Q l7AAnjM2jTmu5vfK2cMs3e/lAZkHyroZ =+5EW -----END PGP SIGNATURE----- --------------enigE2F79AE540E1C200B2371BB7--