suppose having a LAN which contains :
- FTP server (10.0.0.1)
- HTTP server (10.0.0.2)
- SSH server (10.0.0.3)
the LAN use NAT overloading and it has a single public IP (184.108.40.206), now if I
ping on 220.127.116.11 which server will reply ?
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"Overload", or Dynamic PAT, is unidirectional. The connection will only work if the Inside hosts initiate the connection.
If you ping from the Internal hosts, an entry in the connection table will allow the response back through.
If you ping from an external host, there will be no entry in the connection table, and no way for the NAT device to know what internal host was the intended recipient... so the result: the packet is dropped.