Name Server Identifier (NSID)¶
nsid provides server-side support for RFC 5001
which allows DNS clients to request resolver to send back its NSID
along with the reply to a DNS request.
This is useful for debugging larger resolver farms
(e.g. when using Multiple instances, anycast or load balancers).
NSID value can be configured in the resolver’s configuration file:
modules.load('nsid') nsid.name('instance 1')
When dealing with Knot Resolver running in multiple instances managed with systemd see Instance-specific configuration.
You can also obtain configured NSID value:
> nsid.name() 'instance 1'
The module can be disabled at run-time: