(Parameter Types): Document "double".

(Parameters): New parameters: "Use DNS:" and "DNS log threshold:".  (Bug 627).

doc/lyskomd.texi

 \input texinfo
-@c $Id: lyskomd.texi,v 1.47 2002/08/10 18:31:21 ceder Exp $
+@c $Id: lyskomd.texi,v 1.48 2002/08/11 09:37:19 ceder Exp $
 @c %**start of header
 @setfilename lyskomd.info
 @include version.texi
@@ -201,6 +201,11 @@ The parameter is a TCP/IP port. It can be a symbolic port name
 The parameter is a number of some sort. It can be a conference number,
 text number or perhaps a timeout.
 
+@item double
+The parameter is a floating point number.  Any syntax that the C
+function @code{strtod} accepts is OK.  Examples of truly portable
+values: @samp{1} or @samp{1.3}.
+
 @end table
 
 A few parameters have ad-hoc types, that are used for a single
@@ -531,6 +536,19 @@ open file descriptors simultaneously. Each client that is connected to
 the server occupies one file descriptor, and lyskomd needs several file
 descriptors for internal purposes. Default is to not use this parameter.
 
+@item Use DNS: @var{bool}
+The IP address of a client is looked up using DNS when it connects.
+Unfortunately, this lookup blocks the entire server, and it can take
+several minutes.  You can disable DNS lookup with this parameter.
+Default is on.
+
+@item DNS log threshold: @var{double}
+If the @samp{Use DNS:} parameter is true, the server will measure the
+time each DNS lookup takes.  If the time exceeds the specified
+threshold, an entry will be made in the log.  The value is specified
+in seconds.  The default value is 1.5 seconds.  If your libc supports
+it, you can enter @code{+inf} to disable logging.
+
 @item Anyone can create new persons: @var{bool}
 If this is set, anyone can create a new person, even if he lacks
 special bits for doing so. Default is on.