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79 lines
1.4 KiB
Groff
79 lines
1.4 KiB
Groff
.\" Generated by Mmark Markdown Processer - mmark.miek.nl
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.TH "COREDNS-NSID" 7 "March 2021" "CoreDNS" "CoreDNS Plugins"
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.SH "NAME"
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.PP
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\fInsid\fP - adds an identifier of this server to each reply.
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.SH "DESCRIPTION"
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.PP
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This plugin implements RFC 5001
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\[la]https://tools.ietf.org/html/rfc5001\[ra] and adds an EDNS0 OPT
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resource record to replies that uniquely identify the server. This is useful in anycast setups to
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see which server was responsible for generating the reply and for debugging.
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.PP
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This plugin can only be used once per Server Block.
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.SH "SYNTAX"
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.PP
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.RS
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.nf
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nsid [DATA]
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.fi
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.RE
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.PP
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\fBDATA\fP is the string to use in the nsid record.
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.PP
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If \fBDATA\fP is not given, the host's name is used.
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.SH "EXAMPLES"
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.PP
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Enable nsid:
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.PP
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.RS
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.nf
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example.org {
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whoami
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nsid Use The Force
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}
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.fi
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.RE
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.PP
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And now a client with NSID support will see an OPT record with the NSID option:
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.PP
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.RS
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.nf
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% dig +nsid @localhost a whoami.example.org
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;; Got answer:
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;; \->>HEADER<<\- opcode: QUERY, status: NOERROR, id: 46880
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;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 3
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\&....
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; OPT PSEUDOSECTION:
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; EDNS: version: 0, flags:; udp: 4096
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; NSID: 55 73 65 20 54 68 65 20 46 6f 72 63 65 ("Use The Force")
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;; QUESTION SECTION:
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;whoami.example.org. IN A
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.fi
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.RE
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.SH "SEE ALSO"
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.PP
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RFC 5001
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\[la]https://tools.ietf.org/html/rfc5001\[ra]
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