How to retrieve host IP from Nat VirtualBox Guest?

Dfaure

I have a Windows 7 host that handles VirtualBox debian guests with nat. This guest is running some web services accessible from outside via port redirection.

I need to provide external access to these services via url, but I can't rely on proper dns resolution, so the host ip has to be propagated to the guest environment. How can I do this with minimal impact on the host?

Some clarifications: "External", "external access" refers to a web browser at the same level as the host, ie. They can't just rely on host addresses.

A drawing is worth a thousand words:

+--------------+  External                         
| Windows Host |  network   +---------------------+
| +----+       |            |      Web client     |
| |    |      NAT           |  +----------------+ |
| |    ------------------------> Page generated | |
| |    |       |            |  |by VM with URLs | |
| | VM |       |            |  |to host         | |
| |    |       |            |  +--------|-------+ |
| |    |      FWD           |           |         |
| |    <--------------------------------+         |
| |    |       |            +---------------------+
| +----+       |                                   
+--------------+

Gunterbert

One way to do this is the trick behind sites like whatsmyip.com . All you need is a web server in your network that will send back to the client from the IP address that received the request.

Remember that since you are using NAT, the server will see the address of the NAT router (in this case the VM host) as the original address.

To do this, you can create a php-script (ie ) whatsmyip.phpin the web root of your web server , e.g.

//whatsmyip.php
<?php 
//Gets the IP address
$ip = getenv("REMOTE_ADDR") ; 
Echo "$ip; 
?>

and access it from your guest likehttp://webserver/whatsmyip.php

(Source: Thoughtco.com )

Now you just need to evaluate that answer in the service

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