Networking - Problem with setTraficClass() in Linux machine

[manjumg]

Hi,

We have tried to check the IP header using Wireshark on the outgoing packet after setting the client_socket.setTraficClass(34); in the linux machine.

But 34 is not set. instead it was showing 00.

is there any right path to change the dscp value in linux machine?

Please let me know.

[chaosless]

do the values get set if you use only the fundamental (old) qos constants?

    * IPTOS_LOWCOST (0x02)
    * IPTOS_RELIABILITY (0x04)
    * IPTOS_THROUGHPUT (0x08)
    * IPTOS_LOWDELAY (0x10)

e.g. if you do setTrafficClass(16) does that value get set?

are you using UDP sockets?

[manjumg]

yes, we are using the UDP sockets.

if you do setTrafficClass(16) it wont set the value in the UDP socket.

I have not tried the below constants. But I tried with different integer value.

*IPTOS_LOWCOST (0x02)
* IPTOS_RELIABILITY (0x04)
* IPTOS_THROUGHPUT (0x0
* IPTOS_LOWDELAY (0x10)

I am wonder why this is not working in the linux platform.

please put ur comment on this.