[En-Nut-Discussion] DynDNS - query WAN IP

[gpenzo]

enlist at touch2nut.de wrote:

>Hi all,
>
>I want to implement a DynDNS-Client into my application, therefore I need
>the dynamic public WAN-IP of my router.
>At the moment I only see 2 ways to solve the problem:
>
>1. Query an external server (http) which offers the service to "echo" the
>WAN-IP. (I don´t like this) 2. Do it like traceroute (my prefered solution)
>and this leads to my question:
>
>As it seems to me, for the traceroute-like solution I need to "hack" NUT/OS
>to modify TTL and process the echoed ICMP-packets - right !? Has anybody
>another idea - or a free available implementation for a DynDNS-client or
>traceroute?
>
>Greetings from Germany - and a happy new year to all of you !
>
>Andreas Genzel 
>
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>
Hello
I presume that your router has a dns server in it. You will get a ip 
adress form your router so you know who gave you your adress may be 
there is a fuction in ethernut to retirve this.
Also ethernut keeps a route table maybe you can use this. Else maybe you 
can reverse arp or something the router because you know its mac, that 
will not change.

Very possible i'm wrong just some ideas i got when i read your post.