[LINK] ACS new? submission on ISP filtering

Roger Clarke Roger.Clarke at xamax.com.au
Fri Mar 19 11:15:56 AEDT 2010


At 9:42 +1030 19/3/10, Glen Turner wrote:
>ISPs can save significant bandwidth by hosting or peering
>with content distribution networks for those huge static
>items which do consume a lot of bandwidth.

So the http HEAD method doesn't work for such things?
(We're talking specifically of 'static' items).


>For the same reasons, ISPs seek to peer with web sites which
>generate large amounts of traffic. These peerings reduce
>the amount of traffic from transit providers which contain
>static items with significant bandwidth cost.
>
>Today I mainly see web proxies implemented in four scenarios:
>  - within enterprises for accounting or for security (stripping
>    out forbidden items, such as ActiveX code)
>  - within school systems for limiting access to content
>    (I'll note that these systems usually perform poorly, which
>    deeply worries ISPs when people suggest proxies as a suitable
>    solution for large-scale Internet filtering.)
>  - on the Internet as a device for subverting government-imposed
>    Internet filters or for allowing access to IPv4 content from
>    non-IPv4 networks.
>  - in front of web sites to limit the frequency with which dynamic
>    content is computed. This is by far the largest use of proxies
>    in the modern Internet.

Valuable stuff, thannks Glen!


-- 
Roger Clarke                                 http://www.rogerclarke.com/

Xamax Consultancy Pty Ltd      78 Sidaway St, Chapman ACT 2611 AUSTRALIA
                    Tel: +61 2 6288 1472, and 6288 6916
mailto:Roger.Clarke at xamax.com.au                http://www.xamax.com.au/

Visiting Professor in the Cyberspace Law & Policy Centre      Uni of NSW
Visiting Professor in Computer Science    Australian National University



More information about the Link mailing list