Date: Wed, 30 Apr 2008 11:35:43 -1000 From: Clifton Royston <cliftonr@lava.net> To: Sharad Chandra <sharadc@in.niksun.com> Cc: FreeBSD hackers list <freebsd-hackers@freebsd.org> Subject: Re: jumbo packets on em card. Message-ID: <20080430213542.GA21791@lava.net> In-Reply-To: <20080430120016.32879106567C@hub.freebsd.org> References: <20080430120016.32879106567C@hub.freebsd.org>
next in thread | previous in thread | raw e-mail | index | archive | help
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 <sharadc@in.niksun.com>
> Subject: Re: jumbo packets on em card.
> To: Jeremy Chadwick <koitsu@freebsd.org>
> Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org>
> 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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20080430213542.GA21791>