Redirecting traffic to eth0/eth1

kar_the_terrible · 11-07-2006, 01:23 PM

This is more of a network programming question, but I couldnt find the appropriate forum.

I would like to send a packet, for now lets say a ping packet through a specific interface. I know that the ping program supports this. What I want to know is how to set it up in my own source code, so that I can send a packet through eth0 or eth1 depending on what my code chooses.

Do I set it up at the socket level, or when I'm assembling the packet header?

Currently I'm at a loss to find source code samples on the net.

Any help is appreciated, thanks.

ele0100443 · 11-08-2006, 04:21 AM

I think you have to understand your firewall before you can do this

Quote:

Originally Posted by kar_the_terrible

This is more of a network programming question, but I couldnt find the appropriate forum.

I would like to send a packet, for now lets say a ping packet through a specific interface. I know that the ping program supports this. What I want to know is how to set it up in my own source code, so that I can send a packet through eth0 or eth1 depending on what my code chooses.

Do I set it up at the socket level, or when I'm assembling the packet header?

Currently I'm at a loss to find source code samples on the net.

Any help is appreciated, thanks.

kar_the_terrible · 11-08-2006, 08:26 AM

There is no firewall, or any other network filtering/monitoring software. Its an embedded system on an XScale processor, running a barebones install. I could solve the problem by assigning a static IP address to each interface as long as each is on a different subnet, but I dont want to have that constraint.

Now, ping or dhclient for example allows me to pick the interface. I would like to have similar functionality in a custom app: streaming video over UDP. I'm currently going over the dhclient source code.

Hope that clarifies things.