UNIX for Dummies Questions & Answers

It is not my experience but one of my friends. He did the following process:

After awhile he still could connect to the network, but once he rebooted his computer, the computer couldn't connect to the Internet anymore. And the physical address has become:

sometimes it was:

Now even after he tried to modify the value back, he still couldn't go online. This is just weird. Anybody could tell us what's going on here?

Sincerely,

HOUSCOUS

I don't think ifconfig saves modifications, so if he wants to keep his MAC at a certain value, he should include his
in an rc script.

If he set the MAC addy back to 00:10:5c:ab:42:21 after rebooting, he should still be able to connect (actually, now that I think of it, the MAC address is broadcast at boot time, isn't it? it shouldn't really matter unless there's a strange setup... but I'm no networking expert) - perhaps there was a typo?