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content filtering

Discussion in 'General Discussion' started by Anonymous, Oct 19, 2005.

  1. Anonymous

    Anonymous Guest

    I am trying to find any information on how content filtering is implemented in linksys devices. Can someone point me to any documentation or specific parts of source code?

    Thanks in advance
     
  2. littlewhoo

    littlewhoo Network Guru Member

    That depends on the firmware you are using. Afaik the Linksys firmware can only do QOS/blocking/filtering based on MAC/Ports/Ethernet ports.

    Some third-party firmware versions like DD-WRT/Alchemy/Talisman additionaly use more advanced techniques like packet inspection/L7 filters to identify certain protocols.
    http://l7-filter.sourceforge.net/

    The "website blocking by URL/keyword" feature uses uses a module called ipt_webstr, which seems to be basd on the iptables string match extension (-m sting).
    http://www.sveasoft.com/modules/phpBB2/viewtopic.php?t=8069
    http://www.hyperwrt.org/forum/viewtopic.php?pid=2623
     
  3. Anonymous

    Anonymous Guest

    Thanks for the prompt response, littlewhoo!

    I am curious if someone already does content modification on the fly inside the routers, in order to block unwanted portions of content on the page (for example, to protect from iframe vulnerabilities in IE). Seems that the level of blocking is quite simple here and usually the request is rejected on the TCP level.
     

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