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arpwatch (8)
arpwatch (8) ( Русские man: Команды системного администрирования )
>> arpwatch (8) ( Linux man: Команды системного администрирования )
NAME
arpwatch - keep track of ethernet/ip address pairings
SYNOPSIS
arpwatch
[
-dN
] [
-fdatafile
] [
-iinterface
]
[
-nnet[/width
]] [
-rfile
]
DESCRIPTION
Arpwatch
keeps track for ethernet/ip address pairings. It syslogs activity
and reports certain changes via email.
Arpwatch
uses
pcap(3)
to listen for arp packets on a local ethernet interface.
The
-d
flag is used enable debugging. This also inhibits forking into the
background and emailing 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.
The
-i
flag is used to override the default interface.
The
-n
flag specifies additional local networks. This can be useful to
avoid "bogon" warnings when there is more than one network running
on the same wire. If the optional
width
is not specified, the default netmask for the network's class is used.
The
-N
flag disables reporting any bogons.
The
-r
flag is used to specify a savefile
(perhaps created by
tcpdump(8)
or
pcapture(8))
to read from instead
of reading from the network. In this case,
arpwatch
does not fork.
Note that an empty
arp.dat
file must be created before the first time you run
arpwatch.
REPORT MESSAGES
Here's a quick list of the report messages generated by
arpwatch(8)
(and
arpsnmp(8)):
new activity
This ethernet/ip address pair has been used for the first time six
months or more.
new station
The ethernet address has not been seen before.
flip flop
The ethernet address has changed from the most recently seen address to
the second most recently seen address.
(If either the old or new ethernet address is a DECnet address and it
is less than 24 hours, the email version of the report is suppressed.)
changed ethernet address
The host switched to a new ethernet address.
SYSLOG MESSAGES
Here are some of the syslog messages;
note that messages that are reported are also sysloged.
ethernet broadcast
The mac ethernet address of the host is a broadcast address.
ip broadcast
The ip address of the host is a broadcast address.
bogon
The source ip address is not local to the local subnet.
ethernet broadcast
The source mac or arp ethernet address was all ones or all zeros.
ethernet mismatch
The source mac ethernet address didn't match the address inside
the arp packet.
reused old ethernet address
The ethernet address has changed from the most recently seen address to
the third (or greater) least recently seen address.
(This is similar to a flip flop.)
suppressed DECnet flip flop
A "flip flop" report was suppressed because one of the two
addresses was a DECnet address.
