How many total TCP sockets can my linux box have? how can I check the number used?

abefroman · 11-08-2005, 04:05 PM

How many total TCP sockets can my linux box have? how can I check the number currently used?

baldy3105 · 11-09-2005, 03:55 AM

The port field in the TCP and UDP headers is a 16 bit binary number so there are 65536 ports available. So theoretically you could have 65536 ports.

netstat -pant will tell you which ports are active or listening, if you want a second opinion run a portscan to localhost

cheers

abefroman · 11-09-2005, 03:11 PM

Thanks, I know that can determinate the max port and the number of current sockets, but how many total sockets can my server hold?

Is there a max socket connections per port?

Or is there like a general rule of them, like "If you have X connections or more to port 80, then the server is overloaded"?