In order to successfully make your ARP request packet, you need to understand the ARP header. You need to declare an appropriate structure for it in your code. Be advised, the ARP header follows immediately after the Ethernet header.
There had been some confusion regarding the values of different fields, please refer to the following screen shot if in confusion. You should be very clear that in order to broadcast the packet on layer 2, you need to adjust the destination MAC in the Ethernet header only, whereas for the value regarding destination hardware address in ARP header, pay special attention to the field destination MAC address in the ARP header in the image attached.
Also observe the total number of bytes received/captured. You will also need to adjust this value accordingly in your code when you send down the packet, you would need to adjust the parameters of pcap_sendpacket (...) accordingly. Refer to my older post for the code related part.
No comments:
Post a Comment