Exclude the infrastructure that need to be upgraded to support larger routing tables, larger AS numbers or other extensions. Exclude all the infrastructure that needs to be upgraded because it supports&#x2F;does DPI or packet filtering. Exclude the new infrastructure that&#x27;s newly bought and insatlled in order to cope with the network growth that caused the need for v6 in the first place. Exclude the infrastructure that needs to be bought in order to support new media types (WLAN, VDSL, denser&#x2F;faster fiber, whatever).<p>Once all that is excluded, there isn&#x27;t much infrastructure left.