Flowchart

Flowchart will solve your IT problem.
Flowchart worth a million row of texts.

1.NAT

Source: https://technet.microsoft.com/en-us/library/cc756722%28v=ws.10%29.aspx

Packet translatation process atau lebih disingkat sub packet translation.

 

2. IPSec

Source: http://docs.oracle.com/cd/E36784_01/html/E36838/ipsecov-54.html

  IPsec Applied to Outbound Packet Process

IPsec Applied to Inbound Packet Process

3. Access-list

 Source: http://www.cisco.com/c/en/us/support/docs/ip/generic-routing-encapsulation-gre/8014-acl-wp.html