As far as routers are concerned, that's mostly true. If the router has a big routing table and packets are coming from different sources, it may have to spend s

As far as routers are concerned, that's mostly true. If the router has a big routing table and packets are coming from different sources, it may have to spend some time looking up those routes, but that's one of its core competences anyway :) There are going to be, however, many people out there throttling 10k simultaneous connections from the same host, while they wouldn't bat an eye for 20k simultaneous connections coming from 2k different hosts in total.