NAT Network Address Translation. NAT Links cisco.shtmlhttp://www.cisco.com/warp/public/556/nat- cisco.shtml.

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Presentation transcript:

NAT Network Address Translation

NAT Links cisco.shtmlhttp:// cisco.shtml

Why? 32-bit addresses Not all available (private, reserved, multicast, network/broadcast addresses, etc… ) Larger addresses (IPv6) will take time Private addressing

Topology

NAT Modes Classic: Private to Public IP translation Overload: Multiple private to single public using different ports

Classic One to one correspondence between a private and a public IP address is established Router keeps track of these in a table and translates back returning traffic

Overload All private addresses are translated into the same public address but different port numbers are used. Table this time also contains the ports

Additional Reasons to use NAT Security: end IP addresses are not available => only connections initiated by inside are possible Exception: Static NAT (for servers) Administration: migrating networks and multi-homes configurations are made easier

Multi-homed example