Server becomes un-available on loopback configuration

Hello All,

I am following the following documentation

http://www.ultramonkey.org/3/topologies/sl-ha-lb-eg.html

 On Restricting ARP Advertisments for the Director / Real Server I setup the
loopback and after that the server becomes unavailable from the client to
configure.  what am I doing wrong , why does the server become unavailable
and how do I sort this out ?

Thanks a  lot,

Imran.