[AusNOG] BSA Act part 3 (Filtering)

Mark Newton newton at internode.com.au
Wed Jan 2 14:46:58 EST 2008

On 02/01/2008, at 2:10 PM, Bevan Slattery wrote:
> Are you suggesting that with the current P2P caching systems out  
> there they can’t determine the file (or portion thereof) from the  
> flows so it can provide a locally cached copy of it?  Seriously?   
> Then how does a P2P caching system work?  It just inserts some  
> locally cached content randomly in the hope that it’s the same as  
> being sought?  Of course not.  Based upon flows it can identify what  
> is actually being transmitted and then it substitute it’s local copy.

P2P caching systems work by looking at the hashes requested by
the client.

They don't look at the file content, or the file ID, or the p2p data  
flows.  They just look at the hash of the block the client is looking  
on the p2p app's control plane.

If they can't see the hash request stream (because, for example, it's
encrypted, or because the user has instructed their client to filter the
address of the cache) they can't do anything at all.

   - mark

Mark Newton                               Email:  newton at internode.com.au 
Network Engineer                          Email:   
newton at atdot.dotat.org  (H)
Internode Systems Pty Ltd                 Desk:   +61-8-82282999
"Network Man" - Anagram of "Mark Newton"  Mobile: +61-416-202-223

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