PAT

Network Address Translation (NAT) is often used to translate from private IPv4 address to public , IPv4 addresses allowing more devices to communicate on the internet. One popular form of , NAT is Port Address Translation (PAT). PAT allows multiple devices to communicate on the , internet under one public IPv4 address. There are four main types of addresses: Inside Local, , Inside Global, Outside Local, and Outside Global. Inside Local addresses are private addresses , that are seen as host addresses from inside the LAN. Inside Global addresses are the source , addresses seen by devices not in the LAN. Outside Local addresses are the addresses of internet , hosts as seen from inside the LAN. Outside Global addresses are the addresses of the internet , hosts as seen from outside the LAN. PAT assigns a port to each separate host within the LAN , while using the same public address. This allows many devices to communicate under the same , public address - using PAT each public address can support up to 4,000 private hosts. A private , address range of 192.168.15.2 - 192.168.15.5 could communicate in the internet under the , public address of 10.12.12.16. Each address in the range would be assigned a specific port , number which would match the port number on the public address. So 192.168.15.2:1 (assigned , port 1 with ‘:1’) would have the corresponding public address 10.12.12.16:1 while 192.168.15.3:2 , would be 10.12.12.16:2 and so on so forth. This allows numerous devices to connect to the , internet under a single public IP address. Overall, PAT is extremely effective in conserving public , IPv4 addresses and increases the flexibility of connections. , , , , ,