bihourly - track ethernet/ip address pairs
bihourly is a script that automates the operation of arpsnmp(8) by
executing arpfetch(8) on a series of hostnames and then sending the
results to arpsnmp(8) for analysis.
The result is a report of the current pairings between ip addresses and
the corresponding ethernet address of the network hardware as reported
by snmpwalk(8). Activity is logged and noted changes are reported by
In its working directory bihourly expects a file named list which
contains a space separated list of hostnames to be queried and a file
named cname which holds the SNMP community name by which to query these
Contrary to the name, bihourly does not run twice every hour. It runs
once each time it is invoked. For repeated operation bihourly must be
invoked on a periodic basis by a program like cron(1).
/var/lib/arpwatch - default working directory
list - file containing names of hosts to query
cname - file containing the SNMP community name by which to query
arpsnmp(8), arpfetch(8), snmpwalk(8), cron(8)
Please send bug reports to firstname.lastname@example.org.
Craig Leres of the Lawrence Berkeley National Laboratory Network
Research Group, University of California, Berkeley, CA.
The current version is available via anonymous ftp:
This manual page was contributed by Hugo Graumann.