Name Server Identifier (NSID)

Module 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')'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:

'instance 1'

The module can be disabled at run-time: