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

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Presentation transcript:

UCB Network Address Translation Jean Walrand U.C. Berkeley

UCB NAT Overview Example How NAT works

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)

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

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 | …]