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Unable to connect to the Internet through the ASA due to the same security level
This happens because the interfaces with same security level cannot communicate to each other.
Typically the inside interface has a default security level of 100, and the outside interface has a default security level of 0.
The inside interface cannot be renamed or given a different security level. The outside interface can be renamed, but not given a different security level.
Other interfaces can use any number between one and 99.
For access from a higher security to a lower security level, use the nat and globalcommands or the static command. For access from a lower security level to a higher security level, use the static and access-list commands.
Note: Interfaces with the same security level cannot communicate with each other. So, it is always recommended that every interface has a unique security level.
Refer to the nameif command for more information on security levels.