Hi James, Thanks. I did try sudo ifconfig en0 media 100basetX mediaopt full-duplex I got the following error: ifconfig: SIOCSIFMEDIA: Input/output error Do have any idea why my card wont let me go to full duplex? I am connected to a CISCO 6513 which is of course capable of full duplexing. Victor -----Original Message----- From: J.W. Bizzaro To: bioclusters Sent: 7/18/2003 5:33 PM Subject: [Bioclusters] Re: Can't run full duplex on the xserve (fwd) <<Re: [BioDarwin] [Fwd: [Bioclusters] Can't run full duplex on the xserve]>>