Setting ToS field in the IP header, socket programming

gaoanyu · #1 08-Feb-2006, 12:33

Hi friends,

I am new to windows socket programming. I just managed to set up a UDP server and a client, so that the server is able to send UDP packets (read from a file) through the network to the client. In my source code, I can set these information like the following:

CPP / C++ / C Code:

	addr.sin_family = AF_INET;
	addr.sin_port = htons(iPort);
	addr.sin_addr.s_addr = inet_addr(szAddress);

These are fine. However, my particular application needs me to set another field in the IP header, which is the 3-bit Type of Service (ToS) field. I do not know how this could be done, does anyone here who have done something similar before? I am very grateful for your replies. Thanks! I am using VC.NET under windows.

David

davekw7x · #2 08-Feb-2006, 13:01

Quote:

Originally Posted by gaoanyu

Hi friends,

Imy particular application needs me to set another field in the IP header, which is the 3-bit Type of Service (ToS) field.
David

I don't have .NET (or any experience with .NET sockets programming), so I can't answer the question directly.

I suggest that you poke around msdn for the function setsocketopt(), and do some further searching for "Socket Options", specifically the "IP_TOS" socket option. (Note that, for Linux at least, certain parts of the DSCP/ECN fields affected by setsocketopt() may be overwritten by the kernel. Don't know about Windows.)

Regards,

Dave

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Setting ToS field in the IP header, socket programming

Re: Setting ToS field in the IP header, socket programming