coredns/man/coredns-transfer.7

.\" Generated by Mmark Markdown Processer - mmark.miek.nl
.TH "COREDNS-TRANSFER" 7 "March 2026" "CoreDNS" "CoreDNS Plugins"

.SH "NAME"
.PP
\fItransfer\fP - perform (outgoing) zone transfers for other plugins.

.SH "DESCRIPTION"
.PP
This plugin answers zone transfers for authoritative plugins that implement \fB\fCtransfer.Transferer\fR.

.PP
\fItransfer\fP answers full zone transfer (AXFR) requests and incremental zone transfer (IXFR) requests
with AXFR fallback if the zone has changed.

.PP
When a plugin wants to notify it's secondaries it will call back into the \fItransfer\fP plugin.

.PP
The following plugins implement zone transfers using this plugin: \fIfile\fP, \fIauto\fP, \fIsecondary\fP, and
\fIkubernetes\fP. See \fB\fCtransfer.go\fR for implementation details if you are a plugin author that wants to
use this plugin.

.SH "SYNTAX"
.PP
.RS

.nf
transfer [ZONE...] {
  to ADDRESS...
}

.fi
.RE

.IP \(bu 4
\fBZONE\fP The zones \fItransfer\fP will answer zone transfer requests for. If left blank, the zones
are inherited from the enclosing server block. To answer zone transfers for a given zone,
there must be another plugin in the same server block that serves the same zone, and implements
\fB\fCtransfer.Transferer\fR.
.IP \(bu 4
\fB\fCto\fR \fBADDRESS...\fP The hosts \fItransfer\fP will transfer to. Use \fB\fC*\fR to permit transfers to all
addresses. Zone change notifications are sent to all \fBADDRESS\fP that are an IP address or
an IP address and port e.g. \fB\fC1.2.3.4\fR, \fB\fC12:34::56\fR, \fB\fC1.2.3.4:5300\fR, \fB\fC[12:34::56]:5300\fR.
\fB\fCto\fR may be specified multiple times.


.PP
You can use the \fIacl\fP plugin to further restrict hosts permitted to receive a zone transfer.
See example below.

.SH "EXAMPLES"
.PP
Use in conjunction with the \fIacl\fP plugin to restrict access to subnet 10.1.0.0/16.

.PP
.RS

.nf
\&...
  acl {
    allow type AXFR net 10.1.0.0/16
    allow type IXFR net 10.1.0.0/16
    block type AXFR net *
    block type IXFR net *
  }
  transfer {
    to *
  }
\&...

.fi
.RE

.PP
Each plugin that can use \fItransfer\fP includes an example of use in their respective documentation.