/etc/prelude-lml/ruleset/arpwatch.rules is in prelude-lml 1.0.0-5.3ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright (C) 2005 G Ramon Gomez <gene at gomezbrothers dot com>
# All Rights Reserved
#
# This file is part of the Prelude-LML program.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; see the file COPYING. If not, write to
# the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
#
#####
#####
#
# The rules included here were developed using arpwatch-2.1a11-7.9.3.
# Please report any inconsistencies on other versions to G Ramon Gomez at the
# address provided above
#
#####
#LOG:Oct 14 00:47:50 hal arpwatch: new activity 12.34.56.78 0:20:a9:a:c:2a
regex=new (station|activity) ([\d\.]+) ([\da-f:]+); \
classification.text=New ARP address detected; \
id=4200; \
revision=1; \
analyzer(0).name=arpwatch; \
analyzer(0).manufacturer=http://ee.lbl.gov; \
analyzer(0).class=NIDS; \
assessment.impact.severity=low; \
assessment.impact.completion=succeeded; \
assessment.impact.type=other; \
assessment.impact.description=This ethernet/ip address pair ($3/$2) is either new or has not been used recently.; \
source(0).node.address(0).category=ipv4-addr; \
source(0).node.address(0).address=$2; \
source(0).node.address(1).category=mac; \
source(0).node.address(1).address=$3; \
last;
#LOG:Apr 21 23:05:00 192.168.1.35 arpwatch: flip flop 192.168.1.33 0:90:6d:f2:24:0 (8:0:20:c8:fe:15)
regex=(flip flop|changed ethernet address|reused old ethernet address) ([\d\.]+) ([\da-f:]+) \(([\da-f:]+)\); \
classification.text=Ethernet address change detected; \
id=4201; \
revision=1; \
analyzer(0).name=arpwatch; \
analyzer(0).manufacturer=http://ee.lbl.gov; \
analyzer(0).class=NIDS; \
assessment.impact.severity=medium; \
assessment.impact.completion=succeeded; \
assessment.impact.type=other; \
assessment.impact.description=The ethernet address of $2 has changed from $3 to $4.; \
source(0).node.address(0).category=ipv4-addr; \
source(0).node.address(0).address=$2; \
source(0).node.address(1).category=mac; \
source(0).node.address(1).address=$3; \
source(0).node.address(2).category=mac; \
source(0).node.address(2).address=$4; \
last;
#LOG:Apr 21 16:53:59 soledad arpwatch: ethernet broadcast 100.100.100.150 0:0:0:0:0:0
regex=(ethernet|ip) broadcast ([\d\.]+) ([\da-f:]+); \
classification.text=$1 broadcast address detected; \
id=4202; \
revision=1; \
analyzer(0).name=arpwatch; \
analyzer(0).manufacturer=http://ee.lbl.gov; \
analyzer(0).class=NIDS; \
assessment.impact.severity=medium; \
assessment.impact.completion=succeeded; \
assessment.impact.type=other; \
assessment.impact.description=The $1 address of this host is a broadcast address.; \
source(0).node.address(0).category=ipv4-addr; \
source(0).node.address(0).address=$2; \
source(0).node.address(1).category=mac; \
source(0).node.address(1).address=$3; \
last;
#LOG:Nov 18 15:57:50 fw arpwatch: bogon 169.254.189.71 0:c:f1:16:87:d9
regex=bogon ([\d\.]+) ([\da-f:]+); \
classification.text=Bogus IP address detected; \
id=4203; \
revision=1; \
analyzer(0).name=arpwatch; \
analyzer(0).manufacturer=http://ee.lbl.gov; \
analyzer(0).class=NIDS; \
assessment.impact.severity=medium; \
assessment.impact.completion=succeeded; \
assessment.impact.type=other; \
assessment.impact.description=$1 is not local to the local subnet.; \
source(0).node.address(0).category=ipv4-addr; \
source(0).node.address(0).address=$1; \
source(0).node.address(1).category=mac; \
source(0).node.address(1).address=$2; \
last;
#LOG:Feb 24 19:18:36 hal arpwatch: ethernet mismatch 195.215.178.10 0:4:c1:a7:f6:38 (0:50:4:40:c9:8f)
regex=ethernet mismatch ([\d\.]+) ([\da-f:]+) \(([\da-f:]+)\); \
classification.text=MAC address mismatch detected; \
id=4204; \
revision=1; \
analyzer(0).name=arpwatch; \
analyzer(0).manufacturer=http://ee.lbl.gov; \
analyzer(0).class=NIDS; \
assessment.impact.severity=high; \
assessment.impact.completion=succeeded; \
assessment.impact.type=other; \
assessment.impact.description=The source mac ethernet address ($2) didn't match the address inside the arp packet ($3).; \
source(0).node.address(0).category=ipv4-addr; \
source(0).node.address(0).address=$1; \
source(0).node.address(1).category=mac; \
source(0).node.address(1).address=$2; \
source(0).node.address(2).category=mac; \
source(0).node.address(2).address=$3; \
last;
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