Multiple network cards on one PC. Packages sent through the driver.

MedEx

Hello!
On the PC has two network cards.Each card is connected to its subnet.Network is not connected to each other. Creates a UDP socket on the NIC 1 and 2. Send UDP packet from a network card 1 to network card 2. Destination address is the IP address of the NIC 2. Sends a packet from network card 1. On the network card 2, I get a packet from network card 1. The package passed through the driver ethernet.
Pass through the driver from input to output only in such cases:

From IP = To IP(from 192.168.1.1 to 192.168.1.1 )
From IP = To Localhost(127.0.0.1 ...)
From IP = broadcast(255.255.255.255)
From IP = multicast(224.0.0.1 ...)

I guess there is a socket set that prohibit or allow bridging?
Tell me what's wrong? Beforehand thank you!

ZapB

Sorry I'm not quite sure what you are trying to achieve and why. Could you explain a little more clearly please? What platform are you on?

MedEx

Windows XP.
I'm trying to define the network cards on one PC that is connected between point-to-point.

lgeyer

Do you want that your packets do not go through the network stack but are copied directly to the receiving buffer as they are sent to the same host anways?

MedEx

I want to packets reach the physical level and go through it.
The program is written in MSVS 8 is no such problem.

goetz

This stuff is usually handled by the OS. I'm not aware of any means to force a different behavior from application code (despite fiddling around with driver code directly).

MedEx

At first I thought that things in the OS, but then wrote code in Visual Studio 8 and Builder C + + 2010. Packets pass through the physical level and not through the driver to the application layer

MedEx

It seems the case in the loopback, when the driver determines that the recipient is on the same PC, it sends a packet in an input buffer without sending it on a physical level. Please tell me, how to lock the loopback for QUdpSocket?

loladiro

Like this:
@
udpSockect.bind(QHostAddress::LocalHost,12345);
@