Question

NAT: implementation

Accepted Answer

Outgoing datagrams:
(Source IP, port #) is replaced by (NAT IP, new port #)

NAT table
(Source IP, port #, NAT IP, new port #) Tuples are stored

Incoming Datagrams:
Replace (NAT IP, new port #) in the target field with (Source IP, port #)

Front	NAT: implementation
Back	Outgoing datagrams: (Source IP, port #) is replaced by (NAT IP, new port #) NAT table (Source IP, port #, NAT IP, new port #) Tuples are stored Incoming Datagrams: Replace (NAT IP, new port #) in the target field with (Source IP, port #)

Ip Port Source Datagrams Nat Implementation Outgoing Replaced