NAME arpsnmp - keep track of ethernet/ip address pairings

SYNOPSIS arpsnmp [ -d ] [ -f datafile ] [ -e username ] [ -s username ] file [ ... ]

DESCRIPTION Arpsnmp keeps track for ethernet/ip address pairings. It syslogs activ- ity and reports certain changes via email. Arpsnmp reads information from a file (usually generated by snmpwalk(1)).

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.

Note that an empty arp.dat file must be created before the first time you run arpsnmp.

If the -e flag is used, arpsnmp sends e-mail messages to username rather than the default (root). If a single - character is given for the username, sending of e-mail is suppressed, but logging via syslog is still done as usual. (This can be useful during initial runs, to collect data without being flooded with messages about new stations.)

If the -s flag is used, arpsnmp sends e-mail messages with username as the return address, rather than the default (root).

REPORT MESSAGES (See the arpwatch(8) man page for details on the report messages gener- ated by arpsnmp(8).)

FILES /var/lib/arpwatch - default directory arp.dat - ethernet/ip address database ethercodes.dat - vendor ethernet block list

SEE ALSO arpwatch(8), snmpwalk(1), arp(8)

AUTHORS Craig Leres of the Lawrence Berkeley National Laboratory Network Re- search Group, University of California, Berkeley, CA.

The current version is available via anonymous ftp:

BUGS Please send bug reports to

Attempts are made to suppress DECnet flip flops but they arent always successful.

4th Berkeley Distribution 17 September 2000 ARPSNMP(8)