howto use curl to get Internet IP

[Patrick O'Callaghan]

On Fri, 2008-06-06 at 20:41 -0400, Jim wrote:
> Patrick O'Callaghan wrote:
> > On Fri, 2008-06-06 at 18:02 -0400, max wrote:
> >   
> >>> What approach would you suggest that is better to use ?
> >>> I have a DSL AP 2Wire783 in front of my  computer that does not have
> >>>       
> >> the 
> >>     
> >>> capability of giving me the Internet IP.
> >>>
> >>>
> >>>       
> >> You sure about that? I'll admit I have only used about 4 or 5
> >> different 
> >> dsl modems but all of them could be put in bridging mode.
> >>     
> >
> > I presume he uses NAT because he wants to, e.g. because he has more than
> > one machine and his ISP only issues a single IP, or for security.
> >
> > OTOH it's likely that there is a way to scrape the modem's web control
> > page for the IP number without having to ping external addresses. Might
> > be a bit messy though.
> >
> > Actually the cleanest solution is probably just to use a service such as
> > dyndns and register a domain name (the basic service is free), then just
> > look it up when you need to. It means installing ddclient, but it's in
> > the Fedora repos.
> >
> > poc
> >
> >   
> 
> Actually the cleanest solution is probably just to use a service such as
> dyndns and register a domain name (the basic service is free), then just
> look it up when you need to. It means installing ddclient, but it's in
> the Fedora repos.
> 
> 
> That exactly what I got but they don't like you checking for your Internet IP every hour or so it's
> tying up their server.

Works for me and I'm not doing anything special. One possibility, if
your router has an internal equivalent to ddclient, is to have the
router itself ping dyndns. The advantage is that it does it only when
the IP changes. I have a Huawei SmartAX and it can do this.

poc