iRule and host header

Hi All,

I need a bit of help with host headers and iRules. My physical server knows the header as www.abc.com. Is it possible to do an iRule to have www.abc-portal.com on the F5 LTM? So when a user types www.abc-portal.com in a browser I want it to hit the F5 and pass it to the backend server as www.abc.com

I want the the users browser to be able to see www.abc-portal.com at all times.

Cheers Russ