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arp-fingerprint(1)                                          arp-fingerprint(1)




NAME

       arp-fingerprint - Fingerprint a system using ARP


SYNOPSIS

       arp-fingerprint [options] target

       The target should be specified as a single IP address or hostname.  You
       cannot specify multiple targets, IP networks or ranges.

       If you use an IP address for the target, you can use the -o  option  to
       pass  the  --numeric  option  to  arp-scan,  which will prevent it from
       attempting DNS lookups.  This can speed up the fingerprinting  process,
       especially on systems with a slow or faulty DNS configuration.


DESCRIPTION

       arp-fingerprint  fingerprints  the  specified target host using the ARP
       protocol.

       It sends various different types of ARP  request  to  the  target,  and
       records  which types it responds to. From this, it constructs a finger-
       print string consisting of "1" where the target responded and "0" where
       it  did  not.  An example of a fingerprint string is 01000100000.  This
       fingerprint string is then used to lookup the likely  target  operating
       system.

       Many  of  the  fingerprint strings are shared by several operating sys-
       tems, so there is not always a one-to-one mapping  between  fingerprint
       strings  and  operating  systems. Also the fact that a system's finger-
       print matches a certain operating system (or list of operating systems)
       does  not  necessarily mean that the system being fingerprinted is that
       operating system, although it is quite likely. This is because the list
       of  operating systems is not exhaustive; it is just what I have discov-
       ered to date, and there are bound to be operating systems that are  not
       listed.

       The  ARP  fingerprint  of a system is generally a function of that sys-
       tem's kernel (although it is possible for the ARP function to be imple-
       mented in user space, it almost never is).

       Sometimes,  an operating system can give different fingerprints depend-
       ing on the configuration.  An example is Linux, which will respond to a
       non-local  source IP address if that IP is routed through the interface
       being tested.  This is both good and bad: on one hand it makes the fin-
       gerprinting  task  more  complex;  but  on the other, it can allow some
       aspects of the system configuration to be determined.

       Sometimes the fact that two different operating systems share a  common
       ARP fingerprint string points to a re-use of networking code. One exam-
       ple of this is Windows NT and FreeBSD.

       arp-fingerprint uses arp-scan to send the ARP requests and receive  the
       replies.

       There  are other methods that can be used to fingerprint a system using
       arp-scan which can be used in addition to arp-fingerprint.  These addi-
       tional  methods are not included in arp-fingerprint either because they
       are likely to cause disruption to the target system,  or  because  they
       require  knowledge of the target's configuration that may not always be
       available.

       arp-fingerprint is still being developed, and the results should not be
       relied  on. As most of the ARP requests that it sends are non-standard,
       it is possible that it may disrupt some systems, so caution is advised.

       If  you  find a system that arp-fingerprint reports as UNKNOWN, and you
       know what operating system it is running, could you please send details
       of  the operating system and fingerprint to arp-scan@nta-monitor.com so
       I can include it in future versions. Please include the  exact  version
       of  the  operating  system  if  you  know it, as fingerprints sometimes
       change between versions.


OPTIONS

       -h     Display a brief usage message and exit.

       -v     Display verbose progress messages.

       -o <option-string>
              Pass specified options to arp-scan.  You  need  to  enclose  the
              options  string  in  quotes  if it contains spaces. e.g.  -o "-I
              eth1".  The commonly  used  options  are  --interface  (-I)  and
              --numeric (-N).

       -l     Fingerprint  all  hosts on the local network. You do not need to
              specify any target hosts if this option is given.


EXAMPLES

       $ arp-fingerprint 192.168.0.1
       192.168.0.1   01000100000     Linux 2.2, 2.4, 2.6

       $ arp-fingerprint -o "-N -I eth1" 192.168.0.202
       192.168.0.202 11110100000     FreeBSD 5.3, Win98, WinME, NT4, 2000, XP, 2003


NOTES

       arp-fingerprint is implemented in Perl, so you need to  have  the  Perl
       interpreter installed on your system to use it.


AUTHOR

       Roy Hills <Roy.Hills@nta-monitor.com>


SEE ALSO

       arp-scan(1)

       https://github.com/royhills/arp-scan The arp-scan wiki page.



                                August 20, 2016             arp-fingerprint(1)

arp-scan 1.9.6 - Generated Sun Nov 3 07:07:06 CST 2019
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