NAT Loopback

Network Diagram
-----------------------------------
| 1.1.1.1:8000 --> 192.168.168.3:80 |
-----------------------------------
| Source Address | Destination Address |    ...    |
---------------------------------------------------
| 1.1.1.2:1234 | 1.1.1.1:8000 | ... |
---------------------------------------------------
| Source Address | Destination Address |    ...    |
---------------------------------------------------
| 1.1.1.2:1234 | 192.168.168.3:80 | ... |
---------------------------------------------------
|  Source Address  | Destination Address |  ...    | 
---------------------------------------------------
| 192.168.168.3:80 | 1.1.1.2:1234 | ... |
---------------------------------------------------
|  Source Address  | Destination Address |  ...    | 
---------------------------------------------------
| 1.1.1.1:8000 | 1.1.1.2:1234 | ... |
---------------------------------------------------

Port Forwarding

|    Source Address    | Destination Address |    ...    |
----------------------------------------------------------
| 192.168.168.2:1234 | 1.1.1.1:8000 | ... |
----------------------------------------------------------
|    Source Address    | Destination Address |    ...    |
----------------------------------------------------------
| 192.168.168.2:1234 | 192.168.168.3:80 | ... |
----------------------------------------------------------
|    Source Address    | Destination Address |    ...    |
----------------------------------------------------------
| 192.168.168.3:80 | 192.168.168.2:1234 | ... |
----------------------------------------------------------

The Three-way Handshake failed.

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A Programmer, Data Engineer

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