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Arpwatch is a network tool that monitors an ethernet broadcast domain and keeps a flat-file database of ethernet / ip address-pairi
Arpwatch is a network tool that monitors an ethernet broadcast domain and keeps a flat-file database of ethernet / ip address-pairings. Arpwatch furthermore reports certain changes via email and syslog messages.
When you allocate (part of) your ip address space using a dhcp server and run arpwatch as a daemon, it keeps you informed whenever a networked device gets a new network address. This allows you to see if someone is doing something he/she should not be doing, for instance messing with his/her network settings. When you connect a new device, like a new network printer, that out of the box gets its ip address from a dhcp server, arpwatch immediately emails you its ip address so you can telnet or surf to the printer's management agent and configure it, for instance assign it a static ip address.
Arpwatch2html is a Perl script to convert the arpwatch flat-file database into a nice-looking html page. There is an option to sort the arpwatch entries by time, mac address, ip address or hostname. The user can select which fields from the address-pairing database will be shown. It is furthermore possible to omit old entries. Finally, it is also possible to show the recent messages that were sent by arpwatch to the syslog daemon.
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