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ARPALERT(8)		    arp	traffic	monitoring		   ARPALERT(8)

       arpalert	- ARP traffic monitoring

       Arpalert	 uses  ARP protocol monitoring to prevent unauthorized connec-
       tions on	the local network.  If an illegal connection  is  detected,  a
       program	or  script  could  be launched,	which could be used to send an
       alert message, for example.

       -f config_file
	      Specify the config file.

       -i interface
	      Comma separated network interfaces listen	to.

       -p pid_file
	      Use this pid file. this file  containis  a  pid  number  of  the
	      arpalert	session.  If the file exist and	his locked, the	deamon
	      do not run.

       -e exec_script
	      Script launched when an alert is send.

       -D log_level
	      The level	logged.	The levels are between	0  (emergency)	and  7
	      (debug). If 3 is selected	all levels bitween 0 and 3 are logged.

       -l leases_file
	      This  file contain a dump	of the mac address in memory (see con-
	      fig file).

       -m module file
	      Specify a	module file to load

       -d     Run as daemon.

       -F     Run in foreground.

       -v     Watch on screen all the option selected (the  options  specified
	      in config	file and the default options)

       -h     The help command line.

       -w     Debug option: print a dump of packets captured.

       -P     Set  the	interface  in promiscuous mode (don't set this if only
	      the arp analyse is used).

       -V     Print version and	quit.

       The config file contains	3 types	of data: integer, string and  boolean.
       The boolean type	can take values	'oui', 'true', 'yes', '1' for the true
       values or 'non',	'no', 'false', '0' for the falses values.

       user = arpalert
	      Use privileges separation	with this user

       umask = 177
	      Uses this	umask for file creation.

       chroot dir = /home/thierry/arp_test/
	      Use this directory for program jail
	      If this option is	commented out, the program does	 not  use  ch-
	      The  program read	the config file	and open the syslog socket be-
	      fore the chroot:
	      The kill -HUP does not work with chroot.
	      If the syslog program is restarted, the socket  change  and  the
	      arpalert	syslog	system can't be	connect	to the new socket: the
	      logs with	syslog are disabled. Prefere to	use the	log file.
	      The file pathes are relative to the chroot dir (except the  con-
	      fig file)

       log file	= /var/log/arpalert.log
	      The program log into this	file
	      If  this option is commented out,	the internal system log	is not
	      The internal system logs can be used in same time	that syslog.

       log level = 6
	      The level	logged.	The levels are between	0  (emergency)	and  7
	      (debug). If 3 is selected	all levels between 0 and 3 are logged.

       use syslog = true
	      If this option is	false, the syslog system is disabled

       maclist file = /etc/arpalert/maclist.allow
	      White list

       maclist alert file = /etc/arpalert/maclist.deny
	      Black list

       maclist leases file = /var/lib/arpalert/arpalert.leases
	      Dump file

       dump inter = 5
	      Minimun time to wait between two leases dump

       auth request file = /etc/arpalert/authrq.conf
	      List of authorized request

       lock file = /var/run/
	      pid file

       dump packet = false
	      Only  for	 debugging: this dump packet received on standard out-
	      put. The syntax "dump paquet" is also avalaible, but  is	depre-

       daemon =	false
	      If is set	to true, run the program as daemon

       interface = ""
	      Comma  separated network interfaces leisten to. If this value is
	      not specified, the soft select the first interface.

       catch only arp =	TRUE
	      Configure	the network for	catch only arp request.	 The detection
	      type  "new_mac"  is deactived.  This mode	is used	for CPU	saving
	      if Arpalert is running on	a router

       mod on detect = ""
	      Module file loaded by arpalert. This module is launched on  each
	      valid alert.  This system	permit to avoid	a costly fork/exec

       mod config = ""
	      This chain is transfered to the init function of module loaded

       action on detect	= ""
	      Script launched on each detection. Parameters are:
	       - mac address of	requestor,
	       - ip of requestor,
	       - supp. parm.,
	       - ethernet device listening on
	       - type of alert,
	       - optional: ethernet vendor

	      type of alert:
	      0: IP change
	      1: Mac address already detected but not in white list
	      2: Mac address in	black list
	      3: New mac address
	      4: Unauthorized arp request
	      5: Abusive number	of arp request detected
	      6: Ethernet mac address different	from arp mac address
	      7: Flood detected
	      8: New mac address whithout ip address

       execution timeout = 10
	      Script execution timeout (seconds)

       max alert = 20
	      Maximun simultaneous lanched script

       dump black list = false
	      Dump the black listed mac	address	in leases file

       dump white list = false
	      Dump the white listed mac	address	in leases file

       dump new	address	= true
	      Dump the new mac address in leases file

       mac timeout = 259200
	      After  this  time	a mac address is removed from memory (seconds)
	      (default 1 month)

       max entry = 1000000
	      After this limit the memory hash	is  cleaned  (protect  to  arp

       anti flood interval = 10
	      This  permit  to	send  only one mismatch	alert in this time (in

       anti flood global = 50
	      If the number of arp request in seconds exceeds this value,  all
	      alerts are ignored for "anti flood interval" time

       mac vendor file = ""
	      This  file  contain  the	association from mac address to	vendor
	      name.  This  file	  can	be   downloaded	  here:	  http://stan-

       log mac vendor =	false
	      Log vendor name

       alert mac vendor	= false
	      Give vendor name to script

       mod mac vendor =	false
	      Give vendor name to module

       log  referenced address,	alert on referenced address, mod on referenced
       address = false
	      Log/launch script/call module if the address  is	referenced  in
	      hash but is not in white list

       log deny	address, alert on deny address,	mod on deny address = true
	      Log/launch  script/call  module  if  the mac address is in black

       log new address,	alert on new address, mod on new address = true
	      Log/launch script/call module if the address isn't referenced

       log mac change, alert on	mac change, mod	on mac change =	true
	      Log/launch script/call module if the mac	address	 is  different
	      from the last arp	request	with the same ip address

       log ip change, alert on ip change, mod on ip change = true
	      Log/launch  script/call  module  if  the ip address is different
	      from the last arp	request	with the same mac address

       log unauth request, alert on unauth request, mod	on  unauth  request  =
	      Unauthorized  arp	 request:  launch if the request is not	autho-
	      rized in auth file

       ignore unknown sender = true
	      Dont analyse arp request for unknow hosts	(not in	white list)

       ignore self test	= true
	      Ignore ARP self test generated by	windows	dhcp for  unauthorized
	      request detection

       ignore me = true
	      Ignore  arp  request with	mac addresse of	the listing interfaces
	      for the authorizations checks

       unauth ignore time method = 2
	      Select suspend time method:
	      1: ignore	all unauth alerts during "anti flood interval" time
	      2: ignore	only tuple (mac	 address,  ip  address)	 during	 "anti
	      flood interval" time

       log request abus, alert on request abus,	mod on request abus = true
	      Log/launch  script/call module if	the number of request per sec-
	      onds are > "max request"

       max request = 1000000
	      Maximun request authorized by second

       log mac error, alert on mac error, mod on mac error = true
	      Log/launch script/call module if the  ethernet  mac  address  is
	      different	than the arp mac address (only for requestor)

       log flood = true, alert on flood	= true,	mod on flood = true
	      Log/launch  script/call  module if have too many arp request per

       log expire mac address =	true, alert on expire mac address = true,  mod
       on expire mac address = true
	      Log/launch script/call module if the ethernet mac	address	expire

       expire authorized mac addresses = true
	      Allow authorized mac addresses to	expire

       /etc/arpalert/maclist.allow and /etc/arpalert/maclist.deny:
	      All the line with	# as a first caracter are ignored
	      The data on this file take this form
	      The available flags are:
	      ip_change: Ignore	ip change alert	for this mac address
	      black_listed: Ignore black list alerts for this mac address
	      unauth_rq: Ignore	unauthorized requests for this mac address
	      rq_abus: Ignore request abuse for	this mac address
	      mac_error: Ignore	mac error for this mac address
	      mac_change: Ignore mac change for	this mac address
	      mac_expire: Never	expire this mac	address. Usefull if the	option
	      "expire authorized mac addresses"	is used

	      All the words after # character are ignored
	      All the blank characters are ignored
	      The authorisations list for one mac address begins  by  the  mac
	      address into brackets
	      All  the	next  values are ip hosts addresses or ip networks ad-
	      dresses (with /xx	notion)

       sbin/arpalert: binary file
       etc/arpalert/arpalert.conf: default config file
       var/run/ pid file
       var/state/arpalert.leases: leases file

				  2006-05-09			   ARPALERT(8)


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