defaultThis parameter specifies the name of a service
which will be connected to if the service actually requested cannot
be found. Note that the square brackets are NOT
given in the parameter value (see example below).There is no default value for this parameter. If this
parameter is not given, attempting to connect to a nonexistent
service results in an error.Typically the default service would be a
guest ok,
read-only service.Also note that the apparent service name will be changed
to equal that of the requested service, this is very useful as it
allows you to use macros like %S to make
a wildcard service.Note also that any "_" characters in the name of the service
used in the default service will get mapped to a "/". This allows for
interesting things.pub