Re: How to get the public IP of my GW
From: Thomas Wolf (tw_at_wsf.at)
Date: 07/20/04
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Date: Tue, 20 Jul 2004 13:47:43 +0200
Keve Nagy wrote:
> I would like to set up a dyndns name and I know that there are different
> FreeBSD solutions to dynamically update the IP for that name entry when
> it changes, but of course that assumes that the IP in question is the
> FreeBSD mashine's own IP. In my case, my mashines IP stays the same all
> the time, and what I need to update is the external IP of the DSL modem.
>
> Question 1: How can I get the public IP of the DSL modem from my FreeBSD
> mashine? I mean, even traceroute shows the Modem with its 10.0.0.x
> address and not its external IP.
Have a look at:
http://www.dyndns.org/services/dyndns/faq.html#80
> Question 2: Do you think it is possible to get my FreeBSD to update that
> dyndns entry every time when the modem's public IP changes?
At least you can setup a cron job that periodically checks the page
mentioned above (be careful about their 10minutes - restriction),
extracts the url and runs one of the dyndns-clients that are in the ports.
I doubt that you can teach your 'grey box' to actively notify you about
a changed IP, but most of such boxes have a web interface, perhaps you can
manage to retrieve a page from there that contains the actual IP and
you could poll this at smaller intervals.
Thomas
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