An Intranet with Secure Hosts

Option	Reason
-auth	In order to gain access to the secured paths on your web servers, you must supply login information. The can read and then pass this information from an authentication file.
-cgiok	You must explicitly enable the 's ability to parse documents served by CGI scripts.
-trace	You must explicitly state a higher logging level than the default verbose, and in this case the most complete level is trace.

Option	Reason
-nofollow, -unlimited	You want to index links, but only on those servers which are within your domain. Therefore -nofollow cannot be used to stop from following links, and -unlimited would undermine your desire to only follow links to hosts within your domain.
-abspath, -prefixmap	These options only affect indexing file systems.