Problem with DatagramPacket and the IP ToS-Field

[richard.kulzer]

Hello!

I send UDP packets from A to B. In the sending DatagramSocket i set
the Traffic Class like this sendingSocket.setTrafficClass(0x08|0x10).
sendingSocket.getTrafficClass() --> returns 24, ok.

But on the receivers side, also after receiving some packets,
receivingSocket.getTrafficClass() returns 0.
So i think, the IP Header, or at least the Type-of-Service-Field, is
overwritten anywhere. But where? And how can i avoid this?

thanks a lot
Richi