The epic guide to filtering DDoS attacks

[Djlatino]

I feel it needs a sticky

[shakhawat]

Useful post for dedi/vps, but any solution for shared hosting!?

[mayank101]

wow awesome elight thanks for d info..

[Virtual]

very useful information,

thanks!

[XForce!]

+Rep!
Bookmarked Very Helpful...

[World Life]

Awesome tut

[soft2050]

Thanks for this epic guide.

[damnyou]

Very nice guide
It will not work against syn flood.

[JmZ]

Just an FYI, there's no need for any the perl.

tail -n 300 access.log | grep libwww | wc -l
tail -n 300 access.log | grep -oE '^\b[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+\b' | uniq -c | sort -n

[eLight]

You're right, grep is multi threaded whilst Perl isn't. Though the performance difference would be miniscule grep is more than likely faster. Everything that's done in the Perl could be done with awk and grep.

Old habits die hard though, I still love Perl for text manipulation.