On Thu, Jul 4, 2013 at 6:29 PM, Guido García Bernardo <
[email protected]> wrote:

> I increased the number of ephimeral ports on the client before running it.
> In any case I don't think that is the issue, becasue when I run the same
> nodejs server process (on a different port), the two processes are able to
> handle 32K concurrent connections each (64K total).
>

Can you be more clear here on what the problem is and what error you see?

On a CLIENT you cannot make more than 32k connections to the same IP/Port
combination. It's impossible.

On a SERVER you can have trillions of incoming connections, BUT, they MUST
come from different IP addresses up to a maximum of 32k per IP address.

Think of the table like this:

1) Local IP
2) LocalPort
3) Remote IP
4) RemotePort

1 is usually fixed unless you listen on more than one IP address.
2 is usually fixed (e.g. port 80 for http)
3 varies in IPv4 up to 4 billion-ish addresses
4 varies and is generally randomly chosen by the OS, but is in a fixed
range up to 32k

If you fix 1 2 and 3 then you can only have 32k connections. But if you
vary 3 then your number is limitless (practically).

Does that help?

Matt.

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