Hello,

I need help on how to "access" or manipulate the Linux ARP Cache in C, here is the description of the project i'm working in:

There are a lot of tools that analize ARP frames and send an e-mail to the sysadmin, that's easy. What i want to do is to inspect every ARP frame that arrives to my network interface and, if it "passes the tests", then, and ONLY THEN apply the changes in the ARP cache.

I'm able to analize every field of the ARP frame that i capture, but not to avoid the malicious frame to take effect over the cache because i can't stop the kernel.

So, how can i do that? how could i check the frame and if it's a valid one THEN apply it to the cache, just before the kernel does it?

Any help will be appreciated,
Thank you!