Name Server Identifier (NSID)

Knot Resolver 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:

nsid: kres1

Note

When running with multiple workers, each worker adds its own identifier to the end of the NSID.