Strange User-Agent and Keywords

Fake User-Agent

[aiai6125]

When I analyzed access logs of my site, I found the following records.

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---.---.---.--- - - [23/Sep/2007:18:45:53 +0900] "GET /aaaaa.html?link=Mitm04 HTTP/1.1" 200 9469 "http://search.goo.ne.jp/web.jsp?TAB=&MT=%B0%DB%C0%A4%B3%A6" "Mozilla/4.0 (compatible; MSIE 6.0)"
---.---.---.--- - - [22/Sep/2007:21:28:31 +0900] "GET /aaaaa.html?link=Mitm04 HTTP/1.1" 200 19846 "http://www.google.com/search?num=100&hl=ja&ie=sjis&oe=sjis&q=%82%D0%82%AE%82%E7%82%B5%82%CC%82%C8%82%AD%8D%A0%82%C9&filter=0" "Mozilla/4.0 (compatible; MSIE 6.0)"
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These records show a same User-Agent(="Mozilla/4.0 (compatible; MSIE 6.0)") and strange keywords.
I don't know this user-agent.

Does anyone know this user-agent?

[jdMorgan]

It's invalid, so just block it.

Jim

[aiai6125]

Thank you for your quick reply. I would like to do that.

Regards,