![]() srp ( arp_request_broadcast, timeout = 1, verbose = False ) clients_list = for element in answered_list : client_dict = clients_list. Ether ( dst = "ff:ff:ff:ff:ff:ff" ) arp_request_broadcast = broadcast / arp_request answered_list = scapy. Import scapy.all as scapy def scan ( ip ): arp_request = scapy. We will be using scapy module to build our network scanner, please read the official documentation to understand the code. In order to build our network scanner we will use the above concept of ARP the only change we will make that instead broadcasting a message for an specific IP we will broadcast the message for all the IP’s in that subnet, and in return we will get response from every device present on that same network. In order to know the MAC Address of device-B, device-A will use a protocol known ARP.ĪRP stands for Address Resolution Protocol this helps us to links between IP addresses and MAC addresses.So whenever devices know each other’s IP addresses they use ARP and send broadcast message (asking for a specific IP) in order to know the MAC address of the other device,(the devices which poses that specific IP will respond to that device by sending it’s MAC Address). Suppose there a number of clients on same network and a device-A needs to communicate with the device device-B (Suppose A knows the IP Address of B) but remember this point that communication between two device only happens BECAUSE MAC Addresses not by IP Addresses. See there are number of ways to discover clients on same network but the easiest is to replicate what a normal device do to discover another network. We will be building our own NETWORK SCANNER from scratch with th help of python and scapy and yes many of you will be thinking that we have already netdiscover and N-map and many other tools are their to scan number of clients on the same network but the goal behind this writeup is understand basically how a network scanner runs and grasp some more intresting concepts of python. ![]()
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