Sending a message to another computer on the network

[Hasse]

Hi all.
I'm on a FreeBSD 4.10-STABLE machine on 217.209.211.x ,
and would like to send a message to Win-box ( on the same network, but not my 
machine ) that's filling up my  httpd-access.log with junk.
The only thing I know is his IP-adress.
Is this possible ? If it is, how.
Or do I have to block his IP ?
The junk I receive in my log looks like this :
-----------------
httpd-error.log :
<snip> [Sat Jun 05 14:13:43 2004] [error] [client 217.209.211.183] request 
failed: URI too long (longer than 8190)
</snip>
-----------------
httpd-access.log :
<snip>
217.209.211.183 - - [05/Jun/2004:14:11:28 +0200] "SEARCH /\x90\x02\xb1\
</snip>
and the last line ending with :
\x90\x90\x90\x90" 414 391 "-" "-"
----------------
Appreciate any help on this

TIA
/ Hasse.