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MAC address (2nd layer) is unique for one machine & is a life-time identifier set by the manufacturer. IP address ( 3rd layer) could be set and changed any time. Example: IP 134.6.100.16, MAC address: ef.00.c5.a6.bd.98

linmeimei (林妹妹)
(#238023@0)
2001-10-26 -04:00
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