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1. Data is looked at by the IPSec module to see if it should be encrypted or decrypted
   
2. Data comes into an interface as Input and is subject to Input NAT rules for the particular interface.
   
3. Data is subject to global NAT rules
   
4. Data is subject to filtering rules * (in the Filtering Forward panel).
   
5. Data is subject to routing rules.
   
6. Data goes out an Interface as Output and is subject to output NAT
   rules for this particular interface.
   
7. Data is again looked at by the IPSec module to see if it should be encrypted or decrypted

* data going directly to the router uses the Filtering Input panel and data leaving directly from the router uses the Filtering Output panel.