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Access of NAT IP address from inside

Hi experts,

i am not able to access NATed IP from inside of the network.

Is there any reason for that?

Thanks

Vipin

Thanks and Regards, Vipin
2 ACCEPTED SOLUTIONS

Accepted Solutions
Purple

Access of NAT IP address from inside

Hi,

You  can't do hairpinning  on a  Cisco router. The only way to access it  from inside would be either with its private address or by FQDN if there is a record for it on an external DNS server using the feature called DNS doctoring which is the default on Cisco routers.You could also use the hosts file on the clients to map the FQDN to the internal IP.

Regards.

Alain

Don't forget to rate helpful posts.

Access of NAT IP address from inside

Hi Vipin,

You will be not be able to access the nated IP (public) from inside.
You must need to access that with the private IP.
This is because when you are going outside (to internet) through the same public IP and accessing the same is not allowed.


Please rate the helpfull posts.
Regards,
Naidu.

5 REPLIES

Access of NAT IP address from inside

Hello Again Vipin,

Do you have any access-groups on the interfaces that you could share?

Are you trying to access a web server?

Please let us know the answer of those questions and if its possible please share the Running-config.

Regards,

Julio

Julio Carvajal
Senior Network Security and Core Specialist
CCIE #42930, 2xCCNP, JNCIP-SEC
New Member

Access of NAT IP address from inside

Hi,

Say, i have a server which is publically available. But the same thing i can't access from inside.

assume a webserver is that, and it can access publically as http://1.1.1.1:8080

but from inside of the organization i can't access the same page using http://1.1.1.1:8080.

This is what my doubt.

Why is this happening. i dont have the logic behind it. please advice.

Thanks

Vipin

Thanks and Regards, Vipin
New Member

Access of NAT IP address from inside

Hi,

Anyone please advice, what is the reason behind it?

Thanks

Vipin

Thanks and Regards, Vipin
Purple

Access of NAT IP address from inside

Hi,

You  can't do hairpinning  on a  Cisco router. The only way to access it  from inside would be either with its private address or by FQDN if there is a record for it on an external DNS server using the feature called DNS doctoring which is the default on Cisco routers.You could also use the hosts file on the clients to map the FQDN to the internal IP.

Regards.

Alain

Don't forget to rate helpful posts.

Access of NAT IP address from inside

Hi Vipin,

You will be not be able to access the nated IP (public) from inside.
You must need to access that with the private IP.
This is because when you are going outside (to internet) through the same public IP and accessing the same is not allowed.


Please rate the helpfull posts.
Regards,
Naidu.

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