nsid

Name

nsid - adds an identifier of this server to each reply

Description

This handler implements RFC 5001 and adds an option code to replies that uniquely identify the server. This is useful in anycast setups to see which server was responsible for generating the reply and for debugging.

Syntax

nsid [DATA]

Where DATA is the string to use in the nsid record. If DATA is not given, the host's name is used.

Examples

Enable nsid:

example.org {
    nsid Use the force
    whoami
}

And now a client with NSID support will see an OPT record with the NSID option:

% dig +nsid @localhost a whoami.example.org

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 46880
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 3

....

; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; NSID: 55 73 65 20 54 68 65 20 46 6f 72 63 65 ("Use The Force")
;; QUESTION SECTION:
;whoami.example.org.		IN	A

See Also

RFC 5001.