[olug] Full Duplex - NIC

[Kelly Williams]

I checked my Nic on my server and it run full duplex. I noticed that I 
was running two machines with XDMCP disable it on both machines and 
still not getting any faster. I took off a switch on my network still 
not any faster. Any thoughts.

Kelly



Brian Roberson wrote:
> This is pretty well documented, but just for reference, and to get this on
> the mailing list, below is a table of outcomes dependent on setting one side
> of the Ethernet connection and not the other. This is true regardless of the
> devices in use is a server, a switch, router, etc...
>
> Client             Partner               Outcome
> Auto               Auto                   Highest speed / Full duplex
> 100/Full          Auto                   Partner goes into 100/half
> (mismatch)
> 100/half          Auto                   Partner goes into 100/half (ok)
> 10/Full           Auto                   Partner goes into 10/half
> (mismatch)
> 10/half           Auto                   Partner goes into 10/half (ok)
>
> It should be said, that many of us (me included) have found interoperability
> issues when leaving the links to auto negotiate, especially cross vendor.
> Which is why many times we just set it on both sides to enforce what it is
> we want it to do.
>
>
>
>
>
>
>
> On Wed, Feb 3, 2010 at 3:20 PM, Obi-Wan <obiwan at jedi.com> wrote:
>
>   
>>> In order to properly force a particular speed and/or duplex (say,
>>> 100-Full) on a particular link, you need to set it on both link partners
>>> - in this case, the the server and the switch it's connected to. If you
>>> set one side but not the other you will cause a duplex mismatch.
>>>       
>> That's correct.  If you force an interface to particular settings
>> instead of setting it to autonegotiate, then it won't bother announcing
>> or negotiating its settings at all, and will instead just blindly
>> assume that the other end has also been set to those same settings.
>> If the other end has not been forced to those same settings (as when
>> you've left it autonegotiate), then you'll have all sorts of network
>> problems.
>>
>> Always leave your NICs set to autonegotiate unless you really know
>> what you're doing and have a compelling reason to do otherwise.
>>
>> BTDT.
>>
>> --
>> Ben "Obi-Wan" Hollingsworth                             obiwan at jedi.com
>>   The stuff of earth competes for the allegiance I owe only to the
>>     Giver of all good things, so if I stand, let me stand on the
>>       promise that You will pull me through.  -- Rich Mullins
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>>     
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