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10.3: Change Ethernet MAC address from the Terminal
Authored by: urilabob on Apr 05, '06 08:45:49AM

Let me give a legitimate reason. I have just spent ~40 hours debugging a problem with MAC address allocation in a Fedora Core 5 intel box. Strange behaviour - it could establish a network connection and run services such as ssh, but persistent connections such as http and sftp failed. The _only_ reason I was finally able to narrow it down to MAC addresses was that I found this thread, and discovered how to reset my powerbook's MAC address. I was then able to exactly duplicate the FC5 box's network settings on my PB. Lo and Behold, it _didn't_ have the problem - so that meant it was a problem in the box, not with the setup of the network itself. Shortly afterward, I deduced that it had to be the MAC address itself. Turns out that if you set the MAC address under FC5 in upper case - AA:BB:CC:DD:EE:FF - it screws up, at least with my driver. If you set it up in lower case - aa:bb:cc:dd:ee:ff - it works fine. I assume that the driver returns lower case, and some stupid code somewhere is case-sensitive and returns a mismatch if upper case is entered. I doubt I would _ever_ have found this bug, and would have continued to blame the problem on my network managers, if not for this thread.

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