11-16-2019
10:46 PM
- last edited on
03-09-2022
11:25 PM
by
smallbusiness
Hi team,
What is the exact difference between Manual NAT and Object NAT in Cisco ASA?
With Regards,
Magesh Kumar G
11-17-2019 12:21 AM
Hello,
(network) object NAT simply means that a network object is referenced in the NAT statement. Object NAT can be used for dynamic NAT, dynamic PAT, static NAT or static NAT-with-Port-Translation, and Identity NAT.
Manual NAT is a flavor of object NAT.
Have a look at the two links below:
Configuring Network Object NAT
Manual NAT
https://www.practicalnetworking.net/stand-alone/cisco-asa-nat/#manualnat
11-21-2022 04:01 AM
Hi Magesh ,
- The major difference in between Manual NAT & Object NAT ( Auto NAT ) is that in Object nat the nat order is maintained automatically ( the static nats are prefferred over dynamic nats ) while in manual nat we have to specify the order manually while configuring Nats and if not specified , they'll take the order in which they're configured
- Manual Nat is mainly used when we need to configure Conditional NAT as Object Nat doesn't support conditional nat .
10-02-2023 09:35 PM - edited 10-02-2023 09:47 PM
Hope you find your answer. But I thought of adding my answer for them who revisit this page like me for the finest answer.
The Cisco ASA appliance can implement address translation in two ways: network object (auto) NAT and manual NAT. The main differences between these two NAT types are:
1) How you define the real address.
2) How source and destination NAT is implemented.
1) How you define the real address:
Network object NAT: You define NAT as a parameter for a network object.
Example:
object network WEB-SERVER-SSH
host 172.16.30.15
nat (inside,outside) static 72.6.6.15 service tcp 22 2222
Manual NAT: In this case, NAT is not a parameter of the network object, but the network object or group is a parameter of the NAT configuration.
Example:
object network SERVER_X
host 172.16.30.100
object network SERVER_X_PUBLIC
host 100.1.1.1
nat (inside,outside) source static SERVER_X SERVER_X_PUBLIC
2) How source and destination NAT is implemented:
Network object NAT: Each rule can apply to either the source or the destination of a packet. Therefore, two rules might be used, one for the source IP address, and one for the destination IP address.
Manual NAT: A single rule translates both the source and destination.
In addition to this, Manual NAT can do everything that Object/Auto NAT can, and a little extra – namely, Policy NAT and Twice NAT.
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