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How to change the IP settings [mainly IP address, subnet mask and default gateway] in Linux using C/C++ ? I've seen examples that uses sockets but there are not much [besides they don't work]. I've tried this question but it does not work.

Whenever I try the code I use ifconfig to see my network configuration but they are still the same. I have openSUSE 13.2 and have both wireless and ethernet available connections.

I think another solution would be is to change the corresponding script file for the interface but I can't find these script files' locations.

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    Did you try to run your application with root rights? There is no other way in my opinion to change it through C/C++ but use linux/unix headers and libs. Commented Jan 28, 2015 at 9:03
  • mmm, good question. Let me try it. Commented Jan 28, 2015 at 9:03
  • Initially it worked! I will do further testing to make sure. Thanks man! Commented Jan 28, 2015 at 9:08

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In most cases, such kind of operations requires root access. Run your application with root rights and it'll make it work.

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Thanks for the help. I have two questions; Number one is how to set the default gateway ? And number two in the question I mentioned why there is a suggestion to use 'struct sockaddr_in*' instead of 'struct ifreq' ? I mean the second one worls for me.
Setting default gateway I believe is explained here. Second question - don't know. Comment a post there and ask a guy who proposed that. Good luck.
the code you provided works fine but it adds another route. Can I change the current default gateway not adding a new one ?
Maybe you have to remove default gateway first then? Also, here is another link. Don't shy to google it, it can be easily googled.

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