Getting a public IP address when connected to a router

Terry Judd tsj at unimelb.edu.au
Tue Dec 14 00:11:12 EST 2010


OK - thanks Kee (and Sarah).

Terry...


On 14/12/10 4:06 PM, "Kee Nethery" <kee at kagi.com> wrote:

> I agree with Sarah and to explain why ...
> 
> When your computer is inside a firewall or gateway or router that does Network
> Address Translation (NAT
> http://en.wikipedia.org/wiki/Network_address_translation) there is no way to
> know what your external address is because all your computer knows is it's
> internal address and the internal address of the gateway that is connected to
> the outside world.  You have to talk to a machine outside your private network
> and ask it what it sees as your IP address. There are a bunch of web sites
> that will tell you the external address for your computer. You'll need to
> parse the HTML that comes back to you. Sarah provided one web site that I'm
> sure works fine, there are tons of others. A search for "my ip address?" will
> give you lots of web sites that can display your real external IP address.
> 
> If your software really needs to know the external IP address and you do not
> want to rely upon web sites created by others that you have to parse, you can
> build your own web site and hit it. That way you can be sure that the web page
> always gives you back the data in a format you can parse. Otherwise, when your
> chosen external web site alters its HTML response, your code will break.
> 
> Kee Nethery
> 
> 
> On Dec 13, 2010, at 8:07 PM, Terry Judd wrote:
> 
>> Does anyone have a LC routine (or tips on how to write one) that will enable
>> me to get a public IP address rather than the local one assigned by a
>> router?
>> 
>> Terry...
>> 
>> --
>> Dr Terry Judd | Senior Lecturer in Medical Education
>> Medical Education Unit
>> Melbourne Medical School
>> The University of Melbourne
>> 
>> 
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> 
> 
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--
Dr Terry Judd | Senior Lecturer in Medical Education
Medical Education Unit
Melbourne Medical School
The University of Melbourne






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