this is a google translation of topic http://forum.pfsense.org/index.php/topic,32462.0.html
The reason - service arpwatch not run after installation.
Goal - to run arpwatch alfa after installation of packages.
The result - did the two PF2, all ok.
ee / usr / local / etc / rc.d / arpwatch.sh
# /usr/local/sbin/arpwatch -d -i > /var/log/arpwatch.reports 2>&1 & # this strka was generated
/usr/local/sbin/arpwatch -d -i rl1 > /var/log/arpwatch.reports 2>&1 & # rl1 - the right interface
case $1 in
Thanks this fixed it :D
clearing the log causes an error ;/