On 2/14/2010 6:21 PM, Scott Howard wrote: > A "resolver" is basically a client. > > There's two types of resolvers - recursive resolvers (that look after > doing the full resolution themselves - starting at the root servers > and working down), and "stub resolvers" which are only smart enough > pass the entire request onto another server to handle. > > On most system, the "code in your local machine" will be a stub > resolver. That's why you need to configure it to point to another > server that looks after the actual recursion for you.
That is another piece that I had glossed over--the "client" side of a server. > > The "DNS Server" running at your ISP that your stub resolver connects > to is acting as both a server (to accept requests from your client), > and as a resolver (to actually resolve those requests), and almost > certainly also as a cache for results. For simplicity, many people > simply refer to them as Resolvers, whilst others call them Recursive > servers or Caching servers. Calling any form of server a "resolver" seems new to me--or my lack of understanding is older that I like to admit. > > The server actually answering the requests for your domain is an > Authoritative Server. An Authorative-only server doesn't ever act as a > client, so it isn't a resolver. > > It is possibly to run both Authoritative and Recursive server on the > same IP, but it's generally not recommended for many reasons (the most > simple being that of stale data if your server is no longer the > correct nameserver for a domain, but it's still configured to be > authoritative for that domain). Seems like TTL management would take care of that but I think the issues of recursion are now different from the safe world I thought I lived in 20 years ago. Thanks. -- "Government big enough to supply everything you need is big enough to take everything you have." Remember: The Ark was built by amateurs, the Titanic by professionals. Requiescas in pace o email Ex turpi causa non oritur actio Eppure si rinfresca ICBM Targeting Information: http://tinyurl.com/4sqczs http://tinyurl.com/7tp8ml
