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Cat /proc/sys/net/ipv4/ip_local_port_range

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Special Forums IP Networking Cat /proc/sys/net/ipv4/ip_local_port_range
# 1  
Old 11-11-2014
Cat /proc/sys/net/ipv4/ip_local_port_range
Hello,

Code:
/proc/sys/net/ipv4/ip_local_port_range returns 32000 - 61000,

i have a client TCP and a Server TCP. i have used bind() only on the server, the port of socket client is given by the OS that's it ?
it retrieves this port from this range (/proc/sys/net/ipv4/ip_local_port_range) ?

That's it ?


Thanks a lot.
Best Regards.

Moderator's Comments:
Mod Comment Please use code tags next time for your code and data. Thanks
# 2  
Old 11-11-2014
Yup, first and last local port number available, that's it.
# 3  
Old 11-11-2014
Ok, but when i use:


Code:
 printf("%d", ClientAddr.sin_port);

it display a value (29000) not in this range 32000- 61000


Have you an explanation please ?

Thanks a lot.
Best Regards.
# 4  
Old 11-11-2014
and when you
Code:
printf"%d", htons(ClientAddr.sin_port);

# 5  
Old 11-11-2014
I have set this code:

Code:
printf"%d", htons(ClientAddr.sin_port);

in
Code:
the Server.c

after the system call
Code:
Accept()

So it's htons or ntohs ?

Thanks a lot.
# 6  
Old 11-13-2014
They're symmetric, so it doesn't matter. Whether you're converting to or from the network, the bytes get rearranged the exact same way.

Not all systems need to swap bytes at all; big-endian machines already keep their bytes in the proper order. On these machines, ntohs(), etc. do nothing at all.
This User Gave Thanks to Corona688 For This Post:
chercheur111
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