Snort mailing list archives
Sensor placement with presence of web proxies
From: Martin Holste <mcholste () gmail com>
Date: Thu, 26 Jan 2012 15:54:14 -0600
Our org is looking at using web proxies without changing settings on the client. This can involve using Cisco's WCCP or policy-based routing to marshal traffic that would normally go to the Internet to a proxy. As I understand it, the proxy makes the request, returns the response to the router, and the router returns the response to the client. My question is if anyone has run into problems with a tap or span on the side of the router closest to the client. That is, does the proxy change the traffic enough to interfere? It seems nonsensical to put the sensor at the edge of the network since the requests will have the source IP of the proxy, not the actual client, but that means that the traffic the IDS inspects will be inauthentic versus what the remote host on the Internet actually sent. Theoretically, it should be the same traffic, but I'm wondering if anyone can confirm that. I'm especially concerned with appliances that reorder or normalize HTTP headers, etc. Thanks, Martin ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users Please visit http://blog.snort.org to stay current on all the latest Snort news!
Current thread:
- Sensor placement with presence of web proxies Martin Holste (Jan 26)
- Re: Sensor placement with presence of web proxies Jefferson, Shawn (Jan 26)
- Re: Sensor placement with presence of web proxies Joel Esler (Jan 26)
- Re: Sensor placement with presence of web proxies Jefferson, Shawn (Jan 26)
- Re: Sensor placement with presence of web proxies Joel Esler (Jan 26)
- Re: Sensor placement with presence of web proxies Martin Holste (Jan 27)
- Re: Sensor placement with presence of web proxies Joel Esler (Jan 27)
- Re: Sensor placement with presence of web proxies Harvey Chickers (Jan 29)
- Re: Sensor placement with presence of web proxies Joel Esler (Jan 26)
- Re: Sensor placement with presence of web proxies Jefferson, Shawn (Jan 26)
- Re: Sensor placement with presence of web proxies Jason Haar (Jan 26)