ixfr-out, man page entry for nsd-checkzone -i.
@@ -31,6 +31,17 @@ Print the zone contents to stdout if the zone is ok. This prints the
contents as it has been parsed, not literally a copy of the input, but
as printed by the formatting routines in NSD, much like the nsd-control
command write does.
+.TP
+.B \-i \fI<oldzonefile>
+Create an IXFR from the differences between the old zone file and the new
+zone file. The argument to the \-i option is the old zone file, the other
+zonefile argument passed is the new zonefile. The difference is computed
+between the two zonefiles by keeping one version of the zone in memory,
+and another version in a temporary file. The temporary file is located at
+the zonefile directory. This is also where the result is written, to a file
+with the zonefile name, ending with '.ixfr'. This is also where NSD reads it
+when IXFRs are configured for the zone. The other existing ixfr files are
+renamed to become older IXFR contents for the zone, if any such files exist.
.SH "SEE ALSO"
\fInsd\fR(8), \fInsd-checkconf\fR(8)
.SH "AUTHORS"
