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NAT and PAT

NAT and PAT. MM Clements. This week. RFC 1918 Network Address Translation Static and Dynamic Port Address Translation Configuration and testing Issues with NAT/PAT. Private Addressing. NAT . A NAT-enabled device typically operates at the border of a stub network. NAT Terms.

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NAT and PAT

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  1. NAT and PAT MM Clements

  2. This week..... • RFC 1918 • Network Address Translation • Static and Dynamic • Port Address Translation • Configuration and testing • Issues with NAT/PAT

  3. Private Addressing

  4. NAT • A NAT-enabled device typically operates at the border of a stub network.

  5. NAT Terms • Inside Local Addresses – An IP address assigned to a host inside a network. This address is likely to be a RFC 1918 private address. • Inside Global Address – A legitimate IP address assigned by the NIC or service provider that represents one or more inside local IP address to the outside world. • Outside Local Address - The IP address of an outside host as it known to the hosts in the inside network. • Outside Global Address - The IP address assigned to a host on the outside network. The owner of the host assigns this address.

  6. NAT Features • Static NAT is designed to allow one-to-one mapping of local and global addresses. • Dynamic NAT is designed to map a private IP address to a public address.

  7. PAT Features • PAT uses unique source port numbers on the inside global IP address to distinguish between translations.

  8. NAT Benefits • Eliminates re-assigning each host a new IP address when changing to a new ISP • Eliminates the need to re-address all hosts that require external access, saving time and money • Conserves addresses through application port-level multiplexing • Protects network security

  9. Configuring NAT and PAT

  10. Configuring NAT

  11. Configuring PAT

  12. Verifying NAT and PAT Configuration

  13. Troubleshooting NAT and PAT

  14. Issues With NAT

  15. Conclusion • NAT can be static or dynamic • Uses a set of predefined private addresses • Conserves legal IPv4 addresses • NAT plus PAT often used • PAT uses unique source port numbers on the inside global IP address to distinguish between translations • Provides a level of security

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