On 11 Aug 2015, at 14:00, Nico Williams wrote:
On Tue, Aug 11, 2015 at 01:34:35PM -0400, Joe Abley wrote:
On 11 Aug 2015, at 11:11, Viktor Dukhovni wrote:
The ping program talks to whichever recursive resolver is specificed
in /etc/resolv.conf.
More detail is useful, here. The ping program uses a local API to
translate a name into an address. In the case where that translation
requires use of the DNS, a stub resolver sends a query to a recursive
resolver. So probably the stub resolver that we're talking about here
is one of those included in one of those libcs mentioned previously.
ping or something else is kind of irrelevant as long as it's a program
using getaddrinfo() or similar system interface to the system stub
resolver or that uses the system stub resolver (as opposed to the
program being dig(1)).
The stub resolver then is the system's. It should use whatever
/etc/resolv.conf says to use.
... for names that require the DNS for resolution.
*That* has to be a recursive resolver.
... or a proxy, or a server that is both a recursive resolver and an
authority server.
If you want to have only an authoritative server for local. and no
real
DNS, you still need a recursive resolver for this reason (answer
ordering).
An authoritative server for local would be ill-advised if you want
bonjour to work.
Recursive resolvers construct answers from their caches, and may
need to query multiple nameservers
... recursive servers, authoritative servers, or both...
Viktor is pointing out that /etc/resolv.conf can only point to a
recursive resolver.
... or a proxy, or a server that is both a recursive resolver and an
authority server.
Joe