[TCP/IP] Network layer-ARP protocol

Address Resolution Protocol, or ARP (Address Resolution Protocol), is a TCP/IP protocol that obtains a physical address based on an IP address. The ARP protocol can convert a network layer address to any physical address, and from an IP address to a MAC address.

MAC address: physical address. Network card manufacturers must ensure that the MAC address is globally unique. It is 48-digit binary and displays 12-digit hexadecimal.

1. Check my own IP , my own IP and network address

##3. Ping the external network, and the gateway mac address of my LAN will be saved

4. ARP spoofing: Spoofing the MAC address of other people’s network communication IP, so that the other party can find the mac address I specified, which is a data link layer failure

arp -s ip address mac address / /Set a static, arp binding, bind the mac address corresponding to the specified ip address, so that it cannot be deceived

arp -d Delete all caches

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