Adding upstream version 3.2.1.upstream/3.2.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 35 insertions, 0 deletions

diff --git a/modules/nsid/README.rst b/modules/nsid/README.rst
new file mode 100644
index 0000000..ed052c9
--- /dev/null
+++ b/modules/nsid/README.rst
@@ -0,0 +1,35 @@
+.. _mod-nsid:
+
+Name Server Identifier (NSID)
+-----------------------------
+
+This module provides server-side support for :rfc:`5001`
+and is not enabled by default.
+
+DNS clients can request resolver to send back its NSID along with the reply
+to a DNS request.  This is useful for identification of resolver instances
+in larger services (using anycast or load balancers).
+
+
+This is useful tool for debugging larger services,
+as it reveals which particular resolver instance sent the reply.
+
+NSID value can be configured in the resolver's configuration file:
+
+.. code-block:: lua
+
+   modules.load('nsid')
+   nsid.name('instance 1')
+
+You can also obtain configured NSID value:
+
+.. code-block:: lua
+
+   nsid.name()
+   instance 1
+
+The module can be disabled at run-time:
+
+.. code-block:: lua
+
+   modules.unload('nsid')