[c-nsp] Speed Issues

Justin M. Streiner streiner at cluebyfour.org
Thu Feb 2 13:51:42 EST 2006

On Thu, 2 Feb 2006, John Neiberger wrote:

> There's your problem. Hard-setting your speed and duplex is a very bad
> idea. In this particular case, I would bet that the interface facing the
> server is seeing a lot of input errors and the interface on the server,
> if you could see the stats, is seeing late collisions. The problem is
> that some devices still participate in auto negotiation even when you
> have manually configured the speed and duplex. If they don't detect an
> autonegotiating link partner they will assume that they're connected to
> a hub and drop back to half duplex, which results in a duplex mismatch.
> Configure *both* sides to AUTO and all should be well.

Or configure the NIC in the server to run at 100/full.  It's been my 
experience that speed/duplex autonegotiation doesn't always produce the 
best results.


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