From owner-freebsd-hackers@FreeBSD.ORG Wed Apr 30 21:35:57 2008 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id AE9F21065780 for ; Wed, 30 Apr 2008 21:35:57 +0000 (UTC) (envelope-from cliftonr@lava.net) Received: from outgoing01.lava.net (cake.lava.net [IPv6:2001:1888:0:1:230:48ff:fe5b:3b50]) by mx1.freebsd.org (Postfix) with ESMTP id 600228FC13 for ; Wed, 30 Apr 2008 21:35:57 +0000 (UTC) (envelope-from cliftonr@lava.net) Received: from malasada.lava.net (malasada.lava.net [64.65.64.17]) by outgoing01.lava.net (Postfix) with ESMTP id A5208D0273; Wed, 30 Apr 2008 11:35:46 -1000 (HST) Received: by malasada.lava.net (Postfix, from userid 102) id 0C459153882; Wed, 30 Apr 2008 11:35:44 -1000 (HST) Date: Wed, 30 Apr 2008 11:35:43 -1000 From: Clifton Royston To: Sharad Chandra Message-ID: <20080430213542.GA21791@lava.net> Mail-Followup-To: Sharad Chandra , FreeBSD hackers list References: <20080430120016.32879106567C@hub.freebsd.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080430120016.32879106567C@hub.freebsd.org> User-Agent: Mutt/1.4.2.2i Cc: FreeBSD hackers list Subject: Re: jumbo packets on em card. X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 30 Apr 2008 21:35:57 -0000 On Wed, Apr 30, 2008 at 12:00:16PM +0000, freebsd-hackers-request@freebsd.org wrote: > Date: Tue, 29 Apr 2008 17:43:42 +0530 > From: Sharad Chandra > Subject: Re: jumbo packets on em card. > To: Jeremy Chadwick > Cc: FreeBSD Hackers > Message-ID: <200804291743.43010.sharadc@in.niksun.com> > Content-Type: text/plain; charset="iso-8859-1" > > ,---- [Jeremy Chadwick wrote:] > | On Tue, Apr 29, 2008 at 04:13:13PM +0530, Sharad Chandra wrote: > | > I am getting a problem in setting em card to 1000baseTX. It shows "active > | > status" with 100baseTX but as soon as i run "ifconfig em1 media > | > 1000baseTX mediaopt full-duplex", it says *no carrier*. how can i set it > | > to 1000base? > | > | The PHYs support auto-negotiation of speed and duplex, as per the 802.3 > | standard. > | > | Do you have a gigabit switch? If so, does auto-negotiation (e.g. no > | "mediaopt" or "media" settings) work? If not, is the switch a managed > | switch? If so, try explicitly setting the port on the switch to > | 1000mbit, full duplex. If not, then consider buying another switch. > | Many consumer/residential switches do not do auto-negotiation properly, > | resulting in "no carrier" or worse (bad throughput). > > No, I am not using any switch. It is back-to-back connection. It is only > requirement for me. Bear in mind that because GigE uses more of the cable pairs in an RJ-48 than 100baseTX does, a defective or improperly wired crossover cable between two machines may work fine for 100baseTX and fail for 1000baseTX. I strongly suspect that that's your problem. Try replacing the cable or reterminating both ends and carefully checking the color/pin assignments against a reference. -- Clifton -- Clifton Royston -- cliftonr@iandicomputing.com / cliftonr@lava.net President - I and I Computing * http://www.iandicomputing.com/ Custom programming, network design, systems and network consulting services