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nmap-mac-prefixes Sat, -0400 • (444,694 bytes) • ASCII The nmap-mac-prefixes file is used by Nmap to output meaningful OUI vendor names for MAC addresses it detects by matching the three-byte prefix taken from the MAC address and looking for a match in nmap-mac-prefixes file. The Nmap nmap-mac-prefixes file can typically be found in /usr/share/nmap/ on most Linux distributions.

An example of this can be seen by performing a nmap scan of a local network.

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(This is similar to a flip flop.)suppressed DECnet flip flop A 'flip flop' report was suppressed because one of the two addresses was a DECnet address.

FILES/usr/operator/arpwatch - default - ethernet/ip address - vendor ethernet block list SEE ALSOarpsnmp(8), arp(8), bpf(4), tcpdump(1), pcapture(1), pcap(3)AUTHORSCraig Leres of the Lawrence Berkeley National Laboratory Network Research Group, University of California, Berkeley, CA.

If the optional width is not specified, the default netmask for the network's class is used. The -r flag is used to specify a savefile (perhaps created by tcpdump(1) or pcapture(1)) to read from instead of reading from the network. If -u flag is used, arpwatch drops root privileges and changes user ID to username and group ID to that of the primary group of username. If the -e flag is used, arpwatch sends e-mail messages to username rather than the default (root).

If a single '-' character is given for the username, sending of e-mail is suppressed, but logging via syslog is still done as usual.

Fortunately for us there are lot of utilities available to track these attacks , arpwatch is my personal favorite .