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NAT

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Presentation Transcript

  1. NAT Network Address Translation

  2. Why NAT

  3. NAT Terminology

  4. NAT : Network Address translation • One-on-One relationship • internal (local)  external (global) • Only on Layer 3 – IP addresses • Static vs Dynamic

  5. The inside – outside – local – global mess

  6. Source NAT : Overview

  7. Static source NAT

  8. PAT Terminology

  9. PAT or “NAT overloading” - Overview • Only outbound ! Unless static PAT

  10. Static PAT

  11. Problem 2 : Internal addresses also exist on outside

  12. Destination NAT

  13. NAT issues : IP address in the payload

  14. Examples of applications with addressing in the payload • FTP • NetBIOS over TCP/IP • CuSeeMe • DNS • NetMeeting • Routing • SNMP

  15. Example : FTP

  16. Example : DNS and NAT

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