====== Arp-Scan ======
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<color red>Arp-Scan</color> is a command line utility for scanning MAC addresses that are stored in the ARP Table. By default on Raspbian the timeout for ARP table entries is 60s, you can check <color red>cat /proc/sys/net/ipv4/neigh/default/gc_stale_time</color> for exact time.
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==== Installation ====
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To install Arp-Scan, from the command line enter: Note: you may have to do a <color red>sudo apt-get update</color> first.
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    sudo apt-get install arp-scan
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==== Operation ====
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To use <color red>arp-scan</color> enter the following from the command line:
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    sudo arp-scan -l
<color red>arp-scan</color> will not show the <color red>local NIC</color> doing the scan mac address
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==== Example Output ====
<file>
Interface: eth0, datalink type: EN10MB (Ethernet)
Starting arp-scan 1.8.1 with 256 hosts (http://www.nta-monitor.com/tools/arp-scan/)
192.168.100.1     11:1d:aa:a6:66:1b       DrayTek Corp.
192.168.100.2     aa:ac:6f:0c:cf:66       Dell Inc
192.168.100.3     ac:da:0b:6b:cd:ab       (Unknown)
192.168.100.4     ab:61:bb:df:da:dd       (Unknown)
192.168.100.5     aa:00:eb:06:ba:bd       (Unknown)
192.168.100.6     aa:00:eb:a0:ba:ab       (Unknown)
192.168.100.7     aa:aa:b6:6a:ba:d1       (Unknown)
192.168.100.16    b1:bd:6c:1e:b6:bb       (Unknown)
192.168.100.61    11:1a:fb:bb:6b:a6       BSkyB Ltd
192.168.100.66    a6:aa:6e:b1:ba:d1       (Unknown)
192.168.100.66    a6:aa:6e:b1:ba:d1       (Unknown) (DUP: 2)
192.168.100.60    aa:ae:6a:0b:ba:a1       (Unknown)
192.168.100.62    11:ae:fa:f1:ab:aa       (Unknown)
192.168.100.63    fb:6c:ba:ec:1f:ab       (Unknown)
192.168.100.64    aa:ae:6a:1a:10:1d       (Unknown)
</file>
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<color red>*Note: these are fabricated IP and MAC Addresses</color> so don't go looking for them :)
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==== Searching for a particular MAC ====
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If there are a lot of devices on the network, and you know the MAC, you can search using <color red>arp-scan</color>
 and filter the output with <color red>grep</color>
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    sudo arp-scan -l | grep "MAC"
    
    sudo apr-scan -l | grep "00:a1:d0:00-4a:01"
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