Re: How to find callers local IP address?

> Date: Monday, March 21, 2022 07:28:12 +0100
> From: Bo Berglund <[email protected]>
>
> On Sun, 20 Mar 2022 23:33:56 +0100, Micha <[email protected]> wrote:
> 
>> Indeed, it is the basic concept of a NAT that external servers
>> only see the public IP of the router and not the private LAN IP of
>> the client behind the NAT.
>> 
>> An alternative of passing the local IP as URL parameter/query
>> string, is to pass it as custom request header.
> 
> This means that the device address is hidden from view....
> I had hoped that some header item would be this address in order to
> facilitate some kind of callback. Of course I do not intend to call
> back at all but rather find the local LAN address of the switch.
> The device is an IoT type gadget so it is not using any browser or
> such when sending data, just minimalistic http code, I believe...
> 
> If I can get the IP address then I can (on that local LAN) connect
> to the switch's own webpage for configuration purposes and also to
> read out actual state data...
> 

Think of the privacy and security implications if this was possible.
Being able to use such an option to map the internals of a network -
corporate or otherwise - should raise all manner of concerns.