10-24-2012
For monitoring and notification of arp events,
arpwatch can be useful.
Quote:
Originally Posted by
bakunin
Modifying the arp cache was a clever trick. I wouldn't have thought of that.
(Now, of course, should this problem arise, i will gladly pull it out of my memory with a grin and a bored "well, that was obvious, wasn't it" to my colleagues ...) ;-)
If you're interested in reading more about this scenario, "arp poisoning" and "arp spoofing" would be the most relevant search terms.
Regards,
Alister
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LEARN ABOUT DEBIAN
arpsnmp
ARPSNMP(8) System Manager's Manual ARPSNMP(8)
NAME
arpsnmp - keep track of ethernet/ip address pairings
SYNOPSIS
arpsnmp [ -d ]
[ -f datafile ]
[ -s sendmail_path ]
[ -m addr ]
file [ ... ]
DESCRIPTION
Arpsnmp keeps track for ethernet/ip address pairings. It syslogs activity and reports certain changes via email. Arpsnmp reads information
from a file (usually generated by snmpwalk(8)).
The -d flag is used enable debugging. This also inhibits mailing the reports. Instead, they are sent to stderr.
The -f flag is used to set the ethernet/ip address database filename. The default is arp.dat.
(Debian) The -s flag is used to specify the path to the sendmail program. Any program that takes the option -odi and then text from stdin
can be substituted. This is useful for redirecting reports to log files instead of mail.
(Debian) The -m option is used to specify the e-mail address to which reports will be sent. By default, reports are sent to root on the
local machine.
Note that an empty arp.dat file must be created before the first time you run arpsnmp.
REPORT MESSAGES
(See the arpwatch(1) man page for details on the report messages generated by arpsnmp(1).)
FILES
/var/lib/arpwatch - default directory
arp.dat - ethernet/ip address database
/usr/share/arpwatch/ethercodes.dat - vendor ethernet block list
SEE ALSO
arpwatch(8), snmpwalk(8), arp(8)
AUTHORS
Craig Leres of the Lawrence Berkeley National Laboratory Network Research Group, University of California, Berkeley, CA.
The current version is available via anonymous ftp:
ftp://ftp.ee.lbl.gov/arpwatch.tar.gz
BUGS
Please send bug reports to arpwatch@ee.lbl.gov.
Attempts are made to suppress DECnet flip flops but they aren't always successful.
4th Berkeley Distribution 17 September 2000 ARPSNMP(8)