ARPWATCH(8) System Manager's Manual ARPWATCH(8) (NAME) arpwatch - IP (SYNOPSIS) arpwatch [-CdFNpqsvzZ] [-D arpdir] [-f datafile] [-i interface] [-P pidfile] [-w watcher@email] [-W watchee@email] [-n net[/width]] [-x net[/width]] [-r file] (DESCRIPTION) arpwatch /IP . (syslog) . arpwatch pcap(3) ARP . arp.dat . (ethernet MAC address) IPv4 . mac/ip PTR IP mac/ip . (OPTIONS) -C (compact padded) arp.dat 0:8:e1:1:2:d6. -d (debugging) . stderr . -D arpwatch . /usr/local/arpwatch . -f /IP . arp.dat . -F arpwatch (foreground) . -i . -n . / <> . width (netmask) . -N (bogon) . -p (promiscuous mode) . -P pidfile . -q stderr . -r ( tcpdump(1) pcapture(1) ) . arpwatch . arpwatch arp.dat . -s . -v VRRP/CARP RFC5798 (0:0:5e:0:1:xx) . -w . root . -W (From) . root . -z 0.0.0.0 DHCP . -Z (zero padded) arp.dat 00:08:e1:01:02:d6. (REPORT MESSAGES) arpwatch(8) ( arpsnmp(8)) : new activity /IP . new station . flip flop . ( DECnet .) changed ethernet address . (SYSLOG MESSAGES) (syslog) syslog . ethernet broadcast (broadcast) . ip broadcast IP (broadcast) . bogon IP (subnet) . ethernet broadcast ARP (1) (0) . ethernet mismatch ARP . reused old ethernet address ( ) . ( flip flop .) suppressed DECnet flip flop "flip flop" DECnet . (SIGNALS) arpwatch arp.dat . SIGHUP . (FILES) /usr/local/arpwatch arp.dat /IP ethercodes.dat (vendor) (SEE ALSO) arpsnmp(8), arp(8), bpf(4), tcpdump(1), pcapture(1), pcap(3) (AUTHORS) Craig Leres (Lawrence Berkeley National Laboratory Network Research Group) . FTP : ftp://ftp.ee.lbl.gov/arpwatch.tar.gz (BUGS) . flip flop DECnet . syslog . Linux 6.12.107+deb13-amd64 December 2, 2023 Linux 6.12.107+deb13-amd64