Packet forwarding problem

nicholas_xjw

I want to write a program, by disguising my computer as a gateway, so that all other computers in the local area network can send data packets to my computer. I monitor these data packets, and if I want to prevent a machine from accessing the Internet, analyze Its data packets, if the port is 80 or 8080, will not be forwarded to the gateway.

The question is: how should I forward other data packets? It is best to have the relevant source code.

qingclie

You can search for arp interference

格兰希尔

You can look up the DHCP implementation materials to see what principle the computer relies on to obtain the gateway when it is turned on.