[Oisf-users] Web aspirator detection

Amrith Z amrith at hotmail.fr
Thu Nov 3 15:44:21 UTC 2011


Thx, this is really helpful. I'm going to look at this. 

What I need is to detect and block the illegitimate web aspirators. That means not blocking spiders from google for example. The apache module you spoke of might be a solution.

What exactly can be done with a reverse proxy regarding my problem ?

Thanks again.

From: tcpandip at gmail.com
Date: Thu, 3 Nov 2011 09:11:04 -0400
Subject: Re: [Oisf-users] Web aspirator detection
To: amrith at hotmail.fr
CC: mcholste at gmail.com; oisf-users at openinfosecfoundation.org

Yea, I don't think IDS is the tool of choice for addressing/combating such activity. Perhaps there is another compelling piece of the puzzle we're missing.
What are the User-Agents?
Are they not respecting your robots.txt?

Firewall has already been mentioned (even iptables can handle).If you're using Apache, ModSecurity could address. Again, if you're using Apache, you might want to take a peek at mod_bandwidth and mod_limitipconn.

You might also want to check into the reverse proxy with Squid (or your proxy of choice with the capability).
And, yes, if you insist, an IDS signature could alert you given N connections over N timeframe. However, this can be very taxing depending on your parameters.

On Thu, Nov 3, 2011 at 8:49 AM, Martin Holste <mcholste at gmail.com> wrote:

> I'm looking for a way to detect web aspiration. I'm encountering a lot a

> simultaneous connexions from single IPs, which are scrawling all our web

> pages.

That is very normal.  Web spiders from Google, Bing, Baidu, and

thousands of others will continue to crawl pages, but it shouldn't

cause a problem.  Why do you want to detect the web crawls?


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