Hi Michael, Thank you very much for your comments and sending the comment to the list!
And in my memory, this was debate in this working group about the privacy of network access type. But I do not remember there was a consensus. Thank you very much for pointing it out. I think even some people may have concern on it, but those properties could be used in some constraint environment. Or use it in another way. Sebastian gave an idea that we can use relative numbers to indicate the endpoint's provisioned bandwidth instead of access type, which is similar to what we have used to indicate the cost in the alto protocol. I think this is more useful than access type, and can also in somewhat relief the privacy concern? BR, -Haibin -----Original Message----- From: Scharf, Michael (Michael) [mailto:michael.sch...@alcatel-lucent.com] Sent: Thursday, June 26, 2014 5:59 PM To: IETF ALTO Cc: Songhaibin (A) Subject: Potential privacy issue in draft-deng-alto-p2p-ext-01? Haibin asked me to send the following comment from a private discussion also to the list: Section 3.3 of draft-deng-alto-p2p-ext-01 suggest a new Endpoint Property Type "network_access" for P2P peer selection. As far as I recall, this type of ALTO guidance was discussed in the past quite a bit, and there may have been privacy concerns. For instance, draft-ietf-alto-deployments-09 Section 3.2.4. includes the following statement: o Performance metrics that raise privacy concerns. For instance, it has been questioned whether an ALTO service could publicly expose the provisioned access bandwidth, e.g. of cable / DSL customers, because this could enables identification of "premium" customers. That text was already in draft-ietf-alto-deployments before I started to edit this document. For P2P use cases, I wonder whether that concern might (still) apply to endpoint properties such as DSL vs. FTTH as currently suggested draft-deng-alto-p2p-ext-01. Michael _______________________________________________ alto mailing list alto@ietf.org https://www.ietf.org/mailman/listinfo/alto
