How to: Detect ARP Spoofing under UNIX or Linux

by on November 10, 2006 · 2 comments· LAST UPDATED November 27, 2007

in , ,

Q. I would like to know - how do I detect ARP spoofing? I am using Debian Linux.

A. Use arpwatch command to keeps track for ethernet/ip address pairings. It logs message or activity to syslogs and reports certain changes via email.

Arpwatch uses pcap to listen for arp packets on a local ethernet interface.

Install arpwatch

Use apt-get command under Debian / Ubuntu Linux:
# apt-get install arpwatch
$ sudo apt-get install arpwatch

arpwatch command examples

You can watch particular interface with command:
# arpwatch -i eth0

You will notice syslog entries as follows /var/log/syslog file (or /var/log/message file) when changes are made i.e MAC/IP address pair is changed:
# tail -f /var/log/syslogOutput:

Nov 10 15:59:34 debian arpwatch: new station 0:17:9a:a:f6:44 eth0

Above entry displays new workstation. If changes are made you should see something as follows:

Nov 10 15:59:34 debian arpwatch: changed station 0:17:9a:b:f6:f6

You can also use arp -a command to display current ARP table:
$ arp -a

Tweet itFacebook itG+ itDownload PDF versionFound an error/typo on this page?

{ 2 comments… read them below or add one }

1 prakkls February 23, 2010 at 5:25 am

please provide some sample code to implement networking commands


2 Chris June 21, 2010 at 7:48 pm

XArp v2.1.0 for Linux has been released!


Leave a Comment

Tagged as: , , , ,

Previous Faq:

Next Faq: