The link to Sean Murphy's work is inacurrate, it should be (From Lloyd's page): http://www.teltec.dcu.ie/%7Emurphys/ns-work/ instead of : http://www.teltec.dcu.ie/~murphys/diffserv/index.html as in the page at: http://www-mash.CS.Berkeley.EDU/ns/ns-contributed.html Tarik