COREDNS-NSID(7) CoreDNS Plugins COREDNS-NSID(7) NAME nsid - adds an identifier of this server to each reply. DESCRIPTION This plugin implements RFC 5001 <https://tools.ietf.org/html/rfc5001> and adds an EDNS0 OPT resource record to replies that uniquely identify the server. This is useful in anycast setups to see which server was responsi- ble for generating the reply and for debugging. This plugin can only be used once per Server Block. SYNTAX nsid [DATA] 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 { whoami nsid Use The Force } And now a client with NSID support will see an OPT record with the NSID op- tion: % 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 <https://tools.ietf.org/html/rfc5001> CoreDNS March 2026 COREDNS-NSID(7)
NAME | DESCRIPTION | SYNTAX | EXAMPLES | SEE ALSO
Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=coredns-nsid&sektion=7&manpath=FreeBSD+Ports+15.1.quarterly>