Good job...
You can also open 1 million connections using one linux box a) increase local port range 1024 to 65535 b) setup 17 ip address. c) open from each ip address 58824 connections
You can also open 1 million connections using one linux box a) increase local port range 1024 to 65535 b) setup 17 ip address. c) open from each ip address 58824 connections
The issue here is concurrency on the service software. If you have to launch a million instances to listen on a million different ports, you are doing it wrong.
So if you are on 192.168.1.1 and want to connect to a specific port on 192.168.1.2 there aren't enough free port numbers to get 1 million connections. Thus the extending of the "ephemeral port range" (the local port number the kernel is allowed to assign) and addition of more local IPs.
Note: This scenario is only valid for two computers talking to each other. As gilgoomesh said, if you have multiple clients you have virtually unlimited valid connection tuples (src addr, dst addr, src prt, dst prt).