Network Address Translation Sandip Chakraborty. NAT PRIVATE NETWORK PUBLIC NETWORK IP: 10.3.100.101 Port: 8123 IP: 10.3.100.112 Port: 9678 IP: 59.32.123.111.

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Presentation transcript:

Network Address Translation Sandip Chakraborty

NAT PRIVATE NETWORK PUBLIC NETWORK IP: Port: 8123 IP: Port: 9678 IP: Port: 3467

NAT PRIVATE NETWORK PUBLIC NETWORK IP: Port: 8123 IP: Port: 9678 IP: Port: 3467 SP: 8123 DP:3467 SIP: DIP:

NAT PRIVATE NETWORK PUBLIC NETWORK IP: Port: 8123 IP: Port: 9678 IP: Port: 3467 SP: 8123 DP:3467 SIP: DIP: NAT Makes a mapping from the available public IP pool. Say, the NAT has available public IP pool to

NAT PRIVATE NETWORK PUBLIC NETWORK IP: Port: 8123 IP: Port: 9678 IP: Port: 3467 SP: 4598 DP:3467 SIP: DIP: NAT makes the changes in the source IP and source port at IP and TCP headers of the packet

NAT PRIVATE NETWORK PUBLIC NETWORK IP: Port: 8123 IP: Port: 9678 IP: Port: 3467 SP: 4598 DP:3467 SIP: DIP:

NAT PRIVATE NETWORK PUBLIC NETWORK IP: Port: 8123 IP: Port: 9678 IP: Port: 3467 SP: 3467 DP:4598 SIP: DIP: Now, Destination prepares the response packet by interchanging source IP and destination IP

NAT PRIVATE NETWORK PUBLIC NETWORK IP: Port: 8123 IP: Port: 9678 IP: Port: 3467 SP: 3467 DP:4598 SIP: DIP: The packet comes to NAT, as NAT has the IP

NAT PRIVATE NETWORK PUBLIC NETWORK IP: Port: 8123 IP: Port: 9678 IP: Port: 3467 SP: 3467 DP:8123 SIP: DIP: NAT makes inverse translation looking at the NAT table. Make changes at Destination IP and Port

NAT PRIVATE NETWORK PUBLIC NETWORK IP: Port: 8123 IP: Port: 9678 IP: Port: 3467 SP: 3467 DP:8123 SIP: DIP: Deliver the packet to proper destination in the private network