On Tue, Feb 26, 2008 at 3:57 AM, Christian Vogt <[EMAIL PROTECTED]> wrote: > I would like to propose DNS Map [1], a DNS-based mapping resolution > system that combines advantages of push and pull systems. DNS Map > > [1] http://users.piuha.net/chvogt/pub/2008/vogt-2008-dns-map.pdf > or via RRG homepage
Hi Christian, Four comments: 1. Fetching the map alongside the the hostname presents a nasty cache poisoning problem. The hostname response is not necessarily coming from a server authoritative for the address map and the resolver has no way to know the difference without performing additional lookups. 2. Prefetching the map in this manner assumes that the ITR uses the same DNS resolver as the client. Unless the ITR is on the client, that could get hairy fast. 3. Typical behavior of DNS resolvers assume that equal-priority records can be reordered at will and they often do. You're asking for the map records to be implemented in a way that is inconsistent with that behavior. 4. If you haven't already read TRRP, you should: http://bill.herrin.us/network/trrp.html . TRRP uses DNS in much the way you propose and has already ground through a lot of the problems you're likely to encounter. Regards, Bill Herrin -- William D. Herrin [EMAIL PROTECTED] [EMAIL PROTECTED] 3005 Crane Dr. Web: <http://bill.herrin.us/> Falls Church, VA 22042-3004 -- to unsubscribe send a message to [EMAIL PROTECTED] with the word 'unsubscribe' in a single line as the message text body. archive: <http://psg.com/lists/rrg/> & ftp://psg.com/pub/lists/rrg
