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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

Network Address Translation

Jean Walrand

U.C. Berkeley

www.eecs.berkeley.edu/~wlr


NAT

  • Overview

  • Example

  • How NAT works


Overview
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
Example

IPa (typically DHCP)

IPb

  • Home Network

    • One IP address isvisible outside

NAT

IPc

IPb

(DHCP with NAT)

IPc

(DHCP with NAT)


How it works

[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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