Update man pages to reflect port selection (closes #21 github issue)

man/mosh-server.1

@@ -20,6 +20,7 @@ mosh-server \- server-side helper for mosh
 .SH SYNOPSIS
 .B mosh-server
 [IP address to bind]
+[port number to bind]
 .br
 .SH DESCRIPTION
 \fBmosh-server\fP is a helper program for the 
@@ -29,7 +30,11 @@ remote terminal application.
 \fBmosh-server\fP binds to a high UDP port and chooses an encryption
 key to protect the session. It prints both on standard output,
 detaches from the terminal, and waits for the \fBmosh-client\fP to
-establish a connection via UDP.
+establish a connection.
+
+By default, \fBmosh-server\fP binds to a port between 60000 and
+61000. If a port number is supplied on the command line,
+\fBmosh-server\fP will bind to it instead.
 
 \fBmosh-server\fP maintains an entry in the
 .BR utmp(5)

man/mosh.1

@@ -57,8 +57,10 @@ round-trip and do not cause lasting effect.
 
 \fBmosh\fP does not support X forwarding or the non-interactive uses
 of SSH, including port forwarding or sshfs. \fBmosh\fP works through
-typical client-side network address translators but requires high-port
-UDP to pass between client and server.
+typical client-side network address translators but requires UDP to
+pass between client and server. By default, \fBmosh\fP uses the ports
+between 60000 and 61000, but allows the user to request a particular
+UDP port instead.
 
 .SH OPTIONS
 .TP
@@ -86,6 +88,21 @@ confident. This generally means a previous prediction on the same row
 of the terminal has been confirmed by the server, without any
 intervening control character keystrokes.
 
+.TP
+.B \-a
+Synonym for \-\-predict=always
+
+.TP
+.B \-n
+Synonym for \-\-predict=never
+
+.TP
+.B \-p \fINUM\fP, \-\-port=\fINUM\fP
+Use a particular server-side UDP port, for example, if this is the
+only port that is forwarded through a firewall to the
+server. Otherwise, \fBmosh\fP will choose a port between 60000 and
+61000.
+
 .SH SEE ALSO
 .BR mosh-client (1),
 .BR mosh-server (1).

scripts/mosh

@@ -33,14 +33,16 @@ my $port_request = undef;
 
 my $usage =
 qq{Usage: $0 [options] [user@]host
-    --client=PATH        mosh client on local machine  (default: "mosh-client")
-    --server=PATH        mosh server on remote machine (default: "mosh-server")
+        --client=PATH        mosh client on local machine
+                                (default: "mosh-client")
+        --server=PATH        mosh server on remote machine
+                                (default: "mosh-server")
 
         --predict=adaptive   local echo for slower links [default]
 -a      --predict=always     use local echo even on fast links
 -n      --predict=never      never use local echo
 
--p  --port=NUM           server-side UDP port
+-p NUM  --port=NUM           server-side UDP port
 
 Please report bugs to mosh-devel\@mit.edu.
 Mosh home page: http://mosh.mit.edu\n};