Web is a complicated graph, called Site graph. A site allows its trusted neighbors to refer legitimate clients to its privileged service through a privileged referral channel .Website-website relationship and client-website relationship. A trusted client needs to only click on a privileged referral hyperlink on Paypal to obtain a privilege URL, which certificates the client’s service privilege. Under DOS attacks, no problem for Privileged clients. Routers drops unprivileged packets. Web-Referral Architecture for Privileged service is an architecture to protect websites against DDoS attacks. websites offers incentives to serve privileged URLS.