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Troubleshooting Mac OS X 10.3.x: Problems with Ethernet speed

Troubleshooting Mac OS X 10.3.x: Problems with Ethernet speed

Last week we noted an issue where, for some users, browsing is significantly faster than mounting a volume using Connect to Server.

David Toub brings up another issue, beginning to gather steam as more readers report it, where autosensing does not work, and Ethernet connectivity defaults to half duplex (only one way of data transfer at a time):

"My iBook does not autosense the switch properly, and defaults to half-duplex speed. In addition, after uploading a few hundred KB, the connection closes and I have to restart. In the past, I could change the duplex and speed using either Cocktail or by typing the following in Terminal:

sudo ifconfig en0 media 100basetX mediaopt half-duplex; sudo ifconfig en0 media 100basetX mediaopt full-duplex; ifconfig

"This worked great in Jaguar, and allowed me to change my network speed and easily upload without incident.

"Since Mac OS X 10.2.8 (and now Panther), this does not work, and has the added side effect of disabling my network connection entirely. Same thing happens if I switch to full-duplex, 100BaseTX in the Network panel of System Preferences. Apple tech support has acknowledged this is an issue of their making since 10.2.8, but have no fix and I?m not clear if this will be addressed in a future update. For now, I cannot upload files to the network since the connection times out early on."

Feedback? Late-breakers@macfixit.com.

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