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Spotting a denial of service attack
Our web site traffic rose from 37000 hits last Wednesday to 64000 hits on Thursday. Good sales and marketing activity on our part? No - it's a potential problem; all the extra traffic came from a single location and my immediate concerns included: * Possible denial of service, where all the bandwidth was being eaten up by the visitor. * What use were they making of what was approaching a complete copy of the site? * Potential extra costs if we were to hit our traffic ceiling On this occasion, I noticed that we had a problem on Friday when I looked at the previous day's log analysis and spotted the problem sticking out like a sore thumb. I spent a couple of hours yesterday investigating more thoroughly, and putting a filter in place to cap aggressive browsing as it happens - a piece of PHP some 30 or 40 lines long. PHP's a powerful language, so in those lines I'm also able to add a permanent record of the potential abuse to a database ... If you want to read more, I've put a technical analysis and sample PHP script in our solution centre. (written 2005-06-12 07:17:19) Associated topics are indexed under A603 - Web Application Deployment - Further httpd ConfigurationH112 - PHP - Further Web Page and Network Handling H117 - Security in PHP W512 - Web and Intranet - Site Design Aspects
Some other Articles
Comments in TclGraveyard pages Frightening and from-friend viruses and spams No Smoking Pubs Spotting a denial of service attack Walk in Bath Should I use structured or object oriented? The evening after the course Happy Birthday, PHP Code and code maintainance efficiency |
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Link to page ... 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46 at 50 posts per pageThis is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.
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