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Network Address Translation

Network Address Translation. Jean Walrand U.C. Berkeley www.eecs.berkeley.edu/~wlr. NAT. Overview Example How NAT works. Overview. Shortage of IP Addresses CIDR may not be enough IPv6 may take a long time until deployed NAT enables reuse of addresses See IETF RFC 1631 (1994). Example.

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Network Address Translation

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  1. Network Address Translation Jean Walrand U.C. Berkeley www.eecs.berkeley.edu/~wlr

  2. NAT • Overview • Example • How NAT works

  3. Overview • Shortage of IP Addresses • CIDR may not be enough • IPv6 may take a long time until deployed • NAT enables reuse of addresses • See IETF RFC 1631 (1994)

  4. Example IPa (typically DHCP) IPb • Home Network • One IP address isvisible outside NAT IPc IPb (DHCP with NAT) IPc (DHCP with NAT)

  5. [IPa | IPx | TCPb | TCPn | …] [IPb | IPx | TCPm | TCPn | …] [IPx | IPa | TCPn | TCPb | …] [IPx | IPb | TCPn | TCPm | …] [TCPb  IPb, TCPm] How it works • Trick: Use TCP port to distinguish computers IPa IPx NAT IPc IPb

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