1. An apparatus comprising one or more processing elements configured to perform operations, with said operations including: for each particular Internet Protocol version 6 (IPv6) packet of a received plurality of IPv6 packets: determining a particular originating entity of a plurality of originating entities for said particular IPv6 packet based on the IPv6 source address of said particular IPv6 packet, wherein the particular originating entity corresponds to a limited group of network device resources of a plurality of limited groups of network device resources of the apparatus; and processing said particular IPv6 packet using the limited group of network device resources; wherein the IPv6 source address of each of the received plurality of IPv6 packets is a valid IPv6 address; wherein said operations of determining the particular originating entity for a plurality of said received plurality of IPv6 packets include determining the same particular originating entity for at least two different IPv6 source addresses of said received plurality of IPv6 packets; and wherein the apparatus is a network appliance.