NAT Order of Operations - A possible way to help you remember it

instant000

Source: NAT Order of Operation - Cisco Systems

This works for me. It might help you, and it might not. (Yes, I really do type up notes in notepad. This is an excerpt I was working on this evening, and I was trying to get a good way to remember the NAT order of operations.)

This is no "Routing Bits" but it'll have to do.

NAT order-of-operations (tips to remember it):


Inside-to-outside:
ADARA - ACL, Decrypt, ACL, Rate Limit, Accounting
** WPRNC - Web cache, Policy Routing, Routing, NAT, Crypto Map
ACTEQ - ACL, CBAC, TCP Intercept, Encryption, Queueing


Outside-to-inside:
ADARA - ACL, Decrypt, ACL, Rate Limit, Accounting
** WNPRC - Web cache, NAT, Policy Routing, Routing, Crypto Map
ACTEQ - ACL, CBAC, TCP Intercept, Encryption, Queueing


Key tip: Remember either set, and then key on this:
inside-to-outside NAT AFTER routing
outside-to-inside NAT BEFORE routing




NAT inside-to-outside translation order-of-operations:
Phase 1
01. input ACL (if IPsec is implemented)
02. Decryption
03. input ACL
04. input rate limits
05. Input accounting


Phase 2
06. Redirect to Web cache
07. Policy routing
08. Routing
09. NAT inside-to-outside translation
10. Check crypto map and mark for encryption


Phase 3
11. output ACL
12. CBAC
13. TCP intercept
14. Encryption
15. Queueing




NAT outside-to-inside translation order of operations:
Phase 1
01. Input ACL (if IPSEC is implemented)
02. Decryption
03. input ACL
04. input rate limits
05. input accounting


Phase 2
06. Redirect to Web cache
07. NAT outside-to-inside translation
08. Policy routing
09. Routing
10. Check Crypto map and mark for encryption


Phase 3
11. output ACL
12. CBAC
13. TCP intercept
14. Encryption
15. Queueing


Source: NAT Order of Operation - Cisco Systems

Hope this helps!

silver145

Much appreciated!

gorebrush

Yes it helped!