i-Rule to Authorize users baes on presence of cookie

It seems as though you could accomplish what you're doing by setting a single cookie for employees. Check for this cookie to allow/validate use of the employee only URL and bounce everyone else over to the other site. The fourth post down in this thread:

 

 

https://devcentral.f5.com/Default.aspx?tabid=53&forumid=5&postid=6719&view=topic

 

 

...has an irule which could be adapted for this fairly easily. Installing the cookie will be a bit of a trick - this is usually done by the application directly. The LTM can insert a cookie into the headers, of course, and then do things based on its presence (or absence). LTM can also manipulate what's already there - rewrite, encrypt, sanitize, etc.