I'm looking at this pdfI'm looking to buy a couple of used routers on eBay but I don't want to buy more than I need, or mislead myself into thinking one will be "faster" than another for my specific needs.
I will be using a router to NAT outbound LAN web traffic using ext access lists. This router will also destination NAT inbound traffic to various web services based on ext access lists. If a packet doesn't get NATed by the router, it won't have anywhere to arrive on my network.
Is what I am describing "Process Switching", or "Fast/CEF Switching"? If it is Process Switching, the pdf would indicate it doesn't really matter whether I get a 1720 or a 2621XM (other than that I have to deal with counterfeit WIC-1ENET modules on eBay to give the 1700 two NAT sides).
This is all for a 3.0/512 ADSL internet connection, so the upstream is trivial but the downstream can get up to around 2.8mbps in the real world.