(In normal days, sometimes we want to use only one external network cable to achieve multiple terminals surfing the Internet together, but because the price of switches or routers is relatively expensive, it often becomes the main factor restricting us to surf the Internet together. The network card is relatively cheap (the unit price is less than ten yuan), and you can achieve network sharing with a simple configuration. There are many methods. Here we take a desktop computer (dual network card, pay attention to assigning different IPs to each network card) and a laptop as an example to illustrate the configuration process of a small shared network. Desktop as host.)