Interface NVI0

[F Martinez]

Hello,

I see Interface NVI0 on a router but when I do "show int NVI0", I got the error message below.

Router#show int NVI0
                                         ^
% Invalid input detected at '^' marker.

And when I do "show run | sec NVI0", I got no output.

Can you please tell me what this interface is for and it's function.

Thank you in advance!

[Francesco Molino]

Hi

This interface is related to NAT. NVI means NAT Virtual Interface. It allows you to just activate nat (ip nat enable) or not on an interface with specifying ip nat inside or ip nat outside. To work, it's based on ip nat source command configuration.

Thanks

PS: Please don't forget to rate and mark as correct answer if this answered your question

[F Martinez]

So you are saying that NAT is configured on the router? Would you know what specific command enable interface NVI0?

[Francesco Molino · Accepted solution]

Hi

Yes, the virtual interfaces is enabled as soon as you activate nat (legacy or not) but used when you configured ip nat enable under interface configuration. 

Thanks

PS:Please don't forget to rate and mark as correct answer if this answered your question 

[F Martinez]

Thank you.

[Francesco Molino]

You're very welcome

[SamSolutions0]

It's a virtual NAT int, won't show output unless you run this command:

LabR1(config)#do sh ip nat nvi stat