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

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Presentation on theme: "UCB Network Address Translation Jean Walrand U.C. Berkeley www.eecs.berkeley.edu/~wlr."— Presentation transcript:

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

2 UCB NAT Overview Example How NAT works

3 UCB 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 UCB Example Home Network One IP address is visible outside IPa (typically DHCP) IPb (DHCP with NAT) IPc (DHCP with NAT) NAT IPb IPc

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

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