Re: [p2pi] WG Review: Application-Layer Traffic Optimization (alto)

"Das, Saumitra" <> Tue, 21 October 2008 21:59 UTC

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From: "Das, Saumitra" <>
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Date: Tue, 21 Oct 2008 15:00:45 -0700
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>Ono is leveraging off Akamai's DNS information:  You do a few queries to akamai'ed (and other CDN'ed) domains, and use the results as a coordinate space.

>The question is the simpler coordinate: "who's MY resolver and who else uses it".

>>On Oct 21, 2008, at 2:05 PM, Vijay K. Gurbani wrote:

> Nicholas Weaver wrote:

>> Hey, stupid thought...

>> Could you do proximity based on "who's your DNS resolver"?  Do a few

>> name lookups: one to register YOU as using YOUR DNS resolver to the

>> remote coordinator, and one to get "who are other peers using the

>> same resolver"?

>> An ugly, UGLY hack, but it might be interesting to think about.

>> Has anyone done this already?


> Doesn't Ono [1] do that?  Or am I missing something?  CDNs also use

> DNS redirects to redirect clients to nearest servers.


> [1] David R. Choffnes and Fabi?n E. Bustamante. Taming the Torrent:

>    A practical approach to reducing cross-ISP traffic in P2P

>    systems, Proc. of ACM SIGCOMM 2008, August 2008.


> Thanks,


> - vijay

This may work for general ISP users who likely share the same DNS resolvers. However others like say universities would have their own DNS resovler set up although they may also buy access from an ISP as well. So this information will nto be enough to figure out that peers in other universities that can be reached via the Abilene network should be preferred by p2p applications since they will likely have different DNS resolvers.

However this is different from the Taming the torrent approach which uses Akami to infer "being in the same ISPness". They may in some cases have more information about closeness based on cooperation with ISPs.



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