Can someone please guide me on listening to ARP broadcasts in Java?
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You can use JpCap to listen to ARP Packets.
Jpcap is a Java library for capturing and sending network packets.
Using Jpcap, you can develop applications to capture packets from a network interface and visualize/analyze them in Java. You can also develop Java applications to send arbitrary packets through a network interface.
Jpcap has been tested on Microsoft Windows (98/2000/XP/Vista), Linux (Fedora, Mandriva, Ubuntu), Mac OS X (Darwin), FreeBSD, and Solaris.
Jpcap can capture Ethernet, IPv4, IPv6, ARP/RARP, TCP, UDP, and ICMPv4 packets.
Jpcap is open source, and is licensed under GNU LGPL.
Edit: The last commit on JPCAP in github is from 9 years ago.
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2Yup - it will work on anything that supports libpcap/Winpcap, as it's basically a Java binding for that. – Piskvor left the building Feb 04 '11 at 12:09