.B "rebuild"
.br
.B "clean"
+.br
+.BR "mtu " [ \fIpath-mtu ]
.
.\"--------------------------------------------------------------------------
.SH "DESCRIPTION"
and their associated
.B .old
files.
+.TP
+.BR "mtu " [ \fIpath-mtu ]
+Write, as a decimal number on standard output, the recommended MTU for a
+TrIPE tunnel interface, given that the
+.I path-mtu
+between two peers is as specified. The default is 1500, which is very
+commonly correct, but you should check using a tool such as
+.BR tracepath (8).
+Getting the MTU too big will lead to unnecessary fragmentation of
+TrIPE's UDP datagrams; getting it too small will fail to utilize the
+underlying network effectively. If in doubt, it's therefore better to
+underestimate.
.
.\"--------------------------------------------------------------------------
.SH "SEE ALSO"