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Difficulty: EasyInside Source NAT and PAT Configuration and Verification

A network administrator is configuring Network Address Translation (NAT) on a Cisco IOS router interface connected to the internal local area network (GigabitEthernet0/0). What exact Cisco IOS interface configuration command designates this interface as the internal side for NAT translation?

Answer: ip nat inside

Answer

ip nat inside
The command 'ip nat inside' is used in interface configuration mode on a Cisco IOS router to identify the interface connected to the private inside network. This designation is mandatory for the router to properly identify inbound traffic needing source translation.

Step-by-Step Solution

1
Identify the requirement for designating the LAN-facing interface in Cisco IOS NAT configuration.
Recognize that NAT requires defining which interfaces are on the inside (internal LAN) and which are on the outside (WAN/Internet).
Cisco IOS NAT needs explicit interface direction tagging to determine where packets arrive from and where they are headed.
2
Determine the exact interface configuration mode command.
The command is 'ip nat inside'.
This command tags the specified interface as part of the internal network boundary.

Key Concept

Designating inside interface for Cisco IOS NAT/PAT configuration
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Topics

Inside Source NAT and PAT Configuration and Verification

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