While configuring NAT on Router of Layer 3 switch, many a times network administrators find it difficult in getting the required output inspite of putting is the correct commands for NAT to happen. There are multiple protocols and features which may be running on the device like VPN, access list which may disrupt with newly introduced NAT configuration and administrators may face the headache of any one of features not working. Hence it’s key to understand the how traffic from outside the interface enters inside and inside to outside operate

Below table illustrates the order in which transactions are processed using Network Address Translation (NAT) is based on whether a packet goes from the inside network to the outside network, or from the outside network to the inside network.

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