Ok, it's pretty simple :
- the client ask for a new incoming connection to x.x.x.x:80 and open
a new random port. It sends a SYN packet to x.x.x.x with its IP and
this random port (and some other headers)
- the server open a new connection to the client on this port.
That's why the client is limited to 65535 outgoing connections.
And yes the server identify the fd by its ip:port.
Hop im clear ;)
Anthony Catel - envoyé depuis mon iPhone
Le 3 juin 2010 à 13:30, Nouknouk <[email protected]> a écrit :
Le 03/06/2010 13:21, Anthony Catel a écrit :
Nouknouk a écrit :
Hi,
two things you may point your attention on:
- on linux servers, the number of file descriptors (socket has a
file descriptor) is limited by kind of 'user policy'. Take a look
at the 'ulimit' command (you may want to do something like 'ulimit
-n 99999' to raise the maximum of concurrent opened fd)|.
|
This is the goal of rlimit_nofile. APE Server increase this value
itself.
Ok, didn't know.
||
- afaik there are only 2^16 ports available for TCP protocol, so I
suppose a single computer cannot have more than 2^16 connexion at
the same time.
No, it's a server, there is only one port used while a client open
a new port for each new outgoing connection. So, it's not the
issue ;)
Plus a real question, just to understand: I thought there was two
kind of ports in TCP: source AND destination ports, both being 16
bits values ; if the same destination port's value is used by every
client, how does the server's TCP stack to identify to which 'client
fd' belongs the just received network packet ? A combination of IP +
port ?
Nouk²
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