-d is used enable debugging. This also inhibits mailing the reports. Instead, they are sent to stderr.
-f 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.
-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.
-t 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.
/usr/operator/arpwatch - default directory arp.dat - ethernet/ip address database ethercodes.dat - vendor ethernet block list
The current version is available via anonymous ftp:
Attempts are made to suppress DECnet flip flops but they aren't always successful.