2007-02-28 06:39:50 · 4 answers · asked by stephen h 1 in Computers & Internet ➔ Internet
Cleanfeed is a content blocking system implemented in the UK by BT, claimed to be targeted only at illegal content identified by the Internet Watch Foundation, and which all UK ISPs will be obliged to implement a version of by the end of 2007. Information on how this works is restricted to members of the LINX.
There is a blacklist containing URL's to be blocked. Using Border Gateway Protocol (BGP) servers on the backbone routes traffic to IP addresses that match domains that appear in URL's in the blacklist to special HTTP proxy servers. These proxy servers then does the actual filtering by matching HTTP requests to URL's on the blacklist.
The other popular way of blocking content is DNS manipulation. Compared to this Cleanfeed has the following properties.
Harder to circumvent. But still not that hard. Users can use proxy servers. Servers can use another port than 80.
Less collateral damage. DNS based blocking is criticized for blocking all content on a site with the same domain name. Cleanfeed only blocks what is explicitly blacklisted. E.g. it would be possible to block only one image in an article.
2007-03-02 03:34:57 · answer #1 · answered by brownsuga 4 · 0⤊ 0⤋
Your question is a little bit difficult because you did not open it up,however BT can only block websites that is against their terms and conditions.Having said that if some sites is blocked whenever you are trying to log on,i would suggest you check your firewall setting it might be the reason
2007-02-28 06:52:53 · answer #2 · answered by wise5557 5 · 0⤊ 0⤋
If you're talking about the CleanFeed system, it is analysed here:
http://www.openrightsgroup.org/category/content-blocking/
2007-02-28 06:52:37 · answer #3 · answered by kirun 6 · 1⤊ 0⤋
could you give us some more info on what you mean please ?
2007-02-28 06:50:34 · answer #4 · answered by Anonymous · 0⤊ 0⤋