Wendy, All, W dniu 2015-03-25 o 16:30, Wendy Roome pisze:
For download costs, can't the client do an ECS request with dst=my-addr and src=server-addr? Or did I misunderstand your problem?
Indeed, a client may ask for such a ranking (or search for needed information in the maps). The issue is that: 1. If it asks a remote ALTO server, it will get the remote ISP's cost of uploading data from server to a client, not local ISP's cost of downloading them. 2. If it asks a local ALTO server, the server may be unable to assist the client. I.e., it may return nothing valuable or totally nothing. To compute a cost of downloading the data (and/or rank endpoints according to the download cost) the ALTO server needs to know the download path (e.g., the interface through which the traffic is entering the local network or number of AS hops). In my opinion we must assume that a client connects to the local ALTO server, as this gives the ISP more control (and, thus, inventives to provide ALTO information to its clients). I can imagine easily that an ISP provides the service for its clients and disallows remote clients to use it. Thus, the entity that need to gather more information is the local ALTO server. And this is one of my primary use-cases for inter-ALTO.
Best, Piotr 'GhosT' Wydrych -- Piotr 'GhosT' Wydrych .. xmpp:wydrych//agh.edu.pl .. http://wydrych.net/ A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? _______________________________________________ alto mailing list [email protected] https://www.ietf.org/mailman/listinfo/alto
