One quibble I would make with the article is that you are not actually limited to ~65k connections from a client. It is only ~65k per IP address on the client (

One quibble I would make with the article is that you are not actually limited to ~65k connections from a client. It is only ~65k per IP address on the client (given that they're all talking to a single remote port) You can add NICs or virtual IPs and bind your client instances to specific IP addresses instead of INADDR_ANY.