On Fri, Feb 28, 2003 at 08:23:35PM +0100, Cliff Sarginson wrote: > On Thu, Feb 27, 2003 at 11:37:19PM -0000, Chris Phillips wrote: > > Aaron wrote: - > > I have a 3Com 3c900-Combo and ifconfig is reporting that it was in > > half-duplex mode, so I booted up my 3com dos utility book disk and > > checked and it was at half-duplex so I changed it to full. ifconfig is > > still reporting it being half-duplex. Do I need to reinstall the driver > > or something? How would I go about it? > > > > Chris Phillips wrote: > > > Is it plugged into a hub or a switch? > > > A hub will only do half duplex. > > > A switch will do full duplex. > > > Worth mentioning... > > > I don't know what the problem is but I do not think what you say is > correct. A hub can do full duplex, at least in my previous experience.
A hub most certainly can not run full duplex. In order to run at full duplex the tx and rx lines have to be separate. A hub is simply connecting all of the tx and rx lines in the ethernet cable together w/ some amplification. Since all of the tx and rx lines are connected a packet transmitted from one machine will be received by all machines on the network. A switch can do full duplex because each port is essentially its own nic card. The switch segments the network and only traffic that needs to go through a specific segment will go to that segment. This division of traffic is decided based on the mac address of the destination. -- Jeremy Faulkner http://www.gldis.ca To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-questions" in the body of the message
