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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

slide2
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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