Nmap Development mailing list archives

Duplicate MAC prefixes in nmap-mac-prefixes


From: David Fifield <david () bamsoftware com>
Date: Wed, 11 Nov 2009 14:30:05 -0700

I found that there are some duplicate prefixes in nmap-map-prefixes.

0001C8 Thomas Conrad
0001C8 Conrad

080030 Network Research
080030 Cern
080030 Royal Melbourne Inst OF Tech

Their presence is harmless. When looking up a vendor by prefix, the
first one listed will win. When looking up a prefix by vendor string (as
with the --spoof-mac option), usually the first one will win, but there
is a slight chance that a later one will win, if the linear probing in
the hash table that stores the information wraps around the end of the
table.

David Fifield
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