Out of range IP address in /var/log/messages

[Anjang Aki]

Hello,

i have never added IP 213.112.194.33 in my rc.conf and the log keep
generated the error every hours

fyi, my network start from 213.112.194.34 to 213.112.194.62
it causes my cpu utilization turning upside down from 90% idle to 0%
easily and making the logfile getting its size bigger

other than /etc/rc.conf, where else should i checked if there's any
entry of this IP address?

i'm using FreeBSD 6.2-RELEASE
what could be the possibilities and how can I fix this issue?
any advice and solution are highly appreciated

thank you in advanced
--------------------------------

messages log:
[root at freebsdsrv /var/log]# cat messages
Jan 20 16:59:50 freebsdsrv kernel: arplookup 213.112.194.33 failed:
host is not on local network
Jan 20 17:00:50 freebsdsrv kernel: arplookup 213.112.194.33 failed:
host is not on local network
Jan 20 17:00:50 freebsdsrv last message repeated 27 times
Jan 20 17:15:50 freebsdsrv kernel: arplookup 213.112.194.33 failed:
host is not on local network
Jan 20 17:16:50 freebsdsrv kernel: arplookup 213.112.194.33 failed:
host is not on local network
Jan 20 17:16:50 freebsdsrv last message repeated 27 times
Jan 20 17:31:50 freebsdsrv kernel: arplookup 213.112.194.33 failed:
host is not on local network
Jan 20 17:32:50 freebsdsrv last message repeated 28 times
Jan 20 17:40:31 freebsdsrv kernel: Limiting closed port RST response
from 208 to 200 packets/sec
Jan 20 17:40:40 freebsdsrv kernel: Limiting closed port RST response
from 202 to 200 packets/sec
Jan 20 17:47:50 freebsdsrv kernel: arplookup 213.112.194.33 failed:
host is not on local network
Jan 20 17:48:50 freebsdsrv kernel: arplookup 213.112.194.33 failed:
host is not on local network
Jan 20 17:48:50 freebsdsrv last message repeated 27 times
Jan 20 18:03:50 freebsdsrv kernel: arplookup 213.112.194.33 failed:
host is not on local network
Jan 20 18:04:50 freebsdsrv last message repeated 28 times
[root at freebsdsrv /var/log]#


-- 
-- Anjang Aki --