url redirect

You can do that with an iRule like that:

when  HTTP_REQUEST {
   if { [HTTP::host] equals "www.easychat.etisalat.com.ng" } {
      HTTP::redirect "http://www.etisalat.com.ng"
   }
} 

Alternatively, depending on your version, you could also deploy a local traffic policy. See here and here for details.

HTH Martin