Configuration files are read in the following order:
.TP
.I pkgconfdir/config
+Or
+.BR $DISORDER_CONFIG ,
+if that's set; overridden by
+.B \-c
+.RB ( \-\-config )
+command line option, except in
+.BR disrder-playrtp (1),
+which uses
+.BR \-C .
.TP
.I pkgconfdir/config.private
+Or
+.BR $DISORDER_PRIVCONFIG ,
+if that's set, else
+.BR $DISORDER_CONFIG.private .
Should be readable only by the jukebox group.
Not really useful any more and will be abolished in future.
.TP
.I ~\fRUSERNAME\fI/.disorder/passwd
+Or
+.BR $DISORDER_USERCONFIG ,
+if that's set; else
+.BR $DISORDER_HOME/passwd ;
+overridden by
+.B \-u
+.RB ( \-\-user-config )
+command-line option.
Per-user client configuration.
Optional but if it exists must be readable only by the relevant user.
Would normally contain a \fBpassword\fR directive.
.TP
.I pkgconfdir/config.\fRUSERNAME
+(Or
+.BR $DISORDER_USERCONFIG_SYS ,
+if that's set; else
+.BR $DISORDER_CONFIG.\fIUSERNAME .)
Per-user system-controlled client configuration.
Optional but if it exists must be readable only by the relevant user.
Would normally contain a \fBpassword\fR directive.
This option is experimental,
and may change or be removed in a future release.
.TP
+.B rtp_max_payload \fBYTES\fR
+Don't send RTP packets with a UDP payload larger than
+.I BYTES
+(including the 12-byte RTP header). If you know that you will be transmitting
+RTP over networks with an unusually low MTU size, then it is probably useful to
+set this option.
+.IP
+This option is experimental,
+and may change or be removed in a future release.
+.TP
.B rtp_minbuffer \fIFRAMES\fR
Set
.BR disorder-playrtp (1)'s
This is the default, for backwards compatibility reasons.
.RE
.TP
+.B rtp_mtu_discovery \fIOPTION\fR
+Control whether the system attemps path-MTU discovery using RTP packets
+transmitted over IPv4. (This is not configurable in IPv6.) Possible values
+are:
+.RS
+.TP
+.B default
+Do whatever the kernel usually does with UDP packets. This is, err, the
+default.
+.TP
+.B yes
+Force path-MTU disocvery. The `don't fragment' bit is set on outgoing packets
+and we assume that the kernel will handle ICMP `fragmentation needed' errors
+coming back and fragment accordingly.
+.TP
+.B no
+Disable path-MTU discovery. Packets will be sent without the `don't fragment'
+bit, and routers will be expected to fragment packets as necessary.
+.RE
+.IP
+This option is experimental, and may change or be removed in a future release.
+.TP
.B rtp_rcvbuf \fISIZE\fR
Set
.BR disorder-playrtp (1)'s