Category: sysadmin Generated on 2016-03-08
A quick how to list all MAC address present in a LAN segment
$ sudo arp-scan --interface=eth0 --retry=3 --timeout=200 --localnet --random
From man:
arp-scan sends ARP packets to hosts on the local network and displays any responses that are received.
Options explained:
--interface: interface where ARP packets are sent--retry: number of packet sent for each host, 1 is too low to guarantee that the host is effectively offline--timeout: timeout for considering a packet lost, default is 100ms, but it doesn't produce all results--localnet: scan all possible hosts on the network attached to the--interface--random: a sequential scan gives suboptimal results. Randomize for the win
See man arp-scan for further details.
Ping destination on device interface by ARP packets, using source address source.
Useful to check for a specific host.
$ sudo arping -f -I eth0 -c 3 192.168.1.1
-f: finish after first reply-I(required): interface used to send packets-c: number of packets ( again 1 is too low )
$ sudo nmap -sP -PE -PA21,22,23,80,3389 192.168.1.0/24
-sP: skip port scan-PE -PP -PM: different ICMP Ping Types-PA: TCP ACK Ping on specified ports
To process nmap output:
Nmap scan report for ([0-9]+.[0-9]+.[0-9]+.[0-9]+)\nHost is up \(.* latency\).*\nMAC Address: (.*) \((.*)\)
\1 is ip
\2 is mac
\3 is vendor