.\" Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
.
.\"--------------------------------------------------------------------------
-.so ../defs.man.in \" @@@PRE@@@
+.so ../common/defs.man \" @@@PRE@@@
.
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.TH tripe-keys 8 "14 September 2005" "Straylight/Edgeware" "TrIPE: Trivial IP Encryption"
.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.
.
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.SH "SEE ALSO"