"Fossies" - the Fresh Open Source Software Archive  

Source code changes of the file "doc/arm/introduction.rst" between
bind-9.17.3.tar.xz and bind-9.17.4.tar.xz

About: BIND 9.17 implements the Domain Name System (DNS) protocols for the Internet (see the Release Notes). Source code distribution. Unstable development release.

introduction.rst  (bind-9.17.3.tar.xz):introduction.rst  (bind-9.17.4.tar.xz)
skipping to change at line 272 skipping to change at line 272
.. _forwarder: .. _forwarder:
Forwarding Forwarding
^^^^^^^^^^ ^^^^^^^^^^
Even a caching name server does not necessarily perform the complete Even a caching name server does not necessarily perform the complete
recursive lookup itself. Instead, it can *forward* some or all of the recursive lookup itself. Instead, it can *forward* some or all of the
queries that it cannot satisfy from its cache to another caching name queries that it cannot satisfy from its cache to another caching name
server, commonly referred to as a *forwarder*. server, commonly referred to as a *forwarder*.
There may be one or more forwarders, and they are queried in turn until Forwarders are typically used when an administrator does not wish for
the list is exhausted or an answer is found. Forwarders are typically all the servers at a given site to interact directly with the rest of
used when it is undesirable for all the servers at a given site to interact the Internet. For example, a common scenario is when multiple internal
directly with the rest of the Internet's servers. A typical scenario DNS servers are behind an Internet firewall. Servers behind the firewall
involves internal DNS servers and an Internet firewall. forward their requests to the server with external access, which queries
Servers unable to pass packets through the firewall forward their requests to th Internet DNS servers on the internal servers' behalf.
e
server that can, and that server queries the Internet DNS Another scenario (largely now superseded by Response Policy Zones) is to
servers on the internal servers' behalf. send queries first to a custom server for RBL processing before
forwarding them to the wider Internet.
There may be one or more forwarders in a given setup. The order in which
the forwarders are listed in ``named.conf`` does not determine the
sequence in which they are queried; rather, ``named`` uses the response
times from previous queries to select the server that is likely to
respond the most quickly. A server that has not yet been queried is
given an initial small random response time to ensure that it is tried
at least once. Dynamic adjustment of the recorded response times ensures
that all forwarders are queried, even those with slower response times.
This permits changes in behavior based on server responsiveness.
.. _multi_role: .. _multi_role:
Name Servers in Multiple Roles Name Servers in Multiple Roles
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The BIND name server can simultaneously act as a primary for some zones, The BIND name server can simultaneously act as a primary for some zones,
a secondary for other zones, and as a caching (recursive) server for a set a secondary for other zones, and as a caching (recursive) server for a set
of local clients. of local clients.
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