NAT

Question 1

what is NAT

Answer 1

• network address translation
• translates private IP and port to public IP and port
• all devices in a LAN share 1 public IP address
• they all have their own private IP addresses.
• when they send a datagram to the internet they send src IP = their private IP and src port = a port number
• the gateway router makes an entry into the NAT table to translate this into the public IP and gives it a new port number.
• then when a response comes back to the gateway router, it can use the NAT table and the port to translate that back into the private IP and port

Question 2

why do we need NAT

Answer 2

there arnt enough public IP addresses to give to all devices

Question 3

pros of NAT

Answer 3

• only 1 IP needed from ISP
• private IP can change without telling the world
• security

Question 4

cons

Answer 4

• IPv6 could be a better solution
• violates end-to-end arg