PDA

View Full Version : unix machine unique identifier



cweng
23rd March 2005, 07:10 AM
Does each Linux machine have a unique identifier ? If so, how do I get it ?

tashirosgt
23rd March 2005, 03:23 PM
When people need identifiers for machines, they usually use the MAC address of the ethernet card, as shown by the ifconfig command (HWaddr). This is not a perfect way of doing things since the card may get changed and a machine can have several cards etc. I don't think the installation of Linux/ Unix software creates any unique identifier.

crackers
24th March 2005, 04:46 AM
And it is technically possible to have two cards with the same MAC address. Yes, I've actually seen it happen. Freaked the whole IT department out.

cweng
24th March 2005, 06:10 AM
mac addresses are not on the same subnet, it will not have any effect on the network operation.

Jman
24th March 2005, 06:55 AM
The host name is an identifier used to name machines, but certainly doesn't have to be unique.

You can register machines with the Linux Counter (http://counter.li.org/) and get an id, but that's totally voluntary and doesn't have much use outside the counter.