* Claudio Jeker <[email protected]> [2010-05-10 19:30]: > On Mon, May 10, 2010 at 06:56:27PM +0200, Henning Brauer wrote: > > * Benny Lvfgren <[email protected]> [2010-05-10 17:42]: > > > What does ifconfig say, particularly the "media:" line? > > > > > > I've had various problems in the past with certain combinations of > > > switches and ethernet hardware that couldn't work out their > > > autosense capabilities correctly, and that could cause a whole bunch > > > of problems including very slow data rates. > > > > > > Try to lock the port at the desired speed (man ifconfig, man bge), > > > but check with the ISP what physical speed they want to use first. > > > Otherwise you might lose contact with your server since you are (I > > > assume) logged on through the same line that you are fiddling with. > > > > aaaargh! > > > > first, autoneg is pretty damn reliable, the few exceptions are VERY > > old. > > second, taking one side to a fixed speed is calling for trouble. you > > almost certainly end up with one side full- and the otehr half-duplex. > > > > so if your ISP provides ethernet to you asking them whether they set > > the port to auto or fixed is a good idea, but randomly pushing buttons > > is as idiotic as ever. > > > > Not correct autoneg is only reliable when both sides are using autoneg.
if one side is autoneg only that is not autoneg but plain broken. and i explicitely said exactly that above. > Some switches (most notably the cizzzcooeee) disable autoneg if the port > is fixed to a speed below 1G or duplex mode. In that case you must fix the > other side as well. fixed speed implies autoneg disabled. that said, there are more clever switch vendors that allow you to clamp the speed to someting lower than what the interface actually supports and advertise that in autoneg. -- Henning Brauer, [email protected], [email protected] BS Web Services, http://bsws.de Full-Service ISP - Secure Hosting, Mail and DNS Services Dedicated Servers, Rootservers, Application Hosting
