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Beginner

Why "what's my ip" type websites display an ip other than expected?

First, I just want to say, I'm not sure I'm posting this in the community Hierarchy. Sorry. Anyway, here's it goes. Also, I'm getting a lot of "posting in this community has been disabled".

 

For example purposes, I will use these IPs:

Public ip addresses:

10.10.145.26 - is assigned to the Outside Interface

10.10.145.29 - is translated to internal exchange server ip address 192.168.1.25.

From the internet, I can access my internal exchange server using https://10.10.145.29. Also, a cisco tech confirmed that the translation is working.

The question arises when I browse to ipchicken.com or other similar sites. I'm browsing from internal exchange server and ipchicken.com displays public ip address assigned to the firewall outside interface(10.10.145.26 ). I was expecting to see 10.10.145.29. Why?

5 REPLIES 5
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Participant

Those websites always show the outside IP address of your Edge Facing device. Doesn't check NAT translations. 

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Thank you.

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Beginner

Is this a static 1 to 1 NAT translation? Have you tried omitting this address for the ACL that is part of your NAT overload (PAT) statement?

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1 to 1 NAT translation.

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Beginner

Check this basic web-app that displays both Internal IP and Public IP address. May be this would somehow help. It supports only Google chrome and Firefox browser.

 

http://whatismylocalip.com/