Local IP addresses(review)

• Some special IP addresses

  • localhost 127.0.0.1 (loopback address)
  • Internal networks
    • Class A 10.0.0.0
    • Class B 172.16.0.0 to 172.31.0.0
    • Class C 192.168.0.0 to 192.168.255.0
  • Machines behind a firewall can use these internal IP numbers to communicate among them.
  • Only the firewall machine/device (host) needs to have an IP address valid in the Internet.

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