DHCP client and DYnamic DNS service auto-updating

[Darryl Clarke]

On 14/02/06, Carthik Sharma <carthik at gmail.com> wrote:
> On 2/14/06, Darryl Clarke <smartssa at gmail.com> wrote:
> > On 14/02/06, Carthik Sharma <carthik at gmail.com> wrote:
> > > Hi Folks,
> > >
> > > I run a server at home, and would like to have a domain name assigned
> > > to it so I can access it from work. Since I havea dynamic IP, I use
> > > http://sh.nu to serve me as a dynamic dns server.
> > >
> > > I got a script from said website to enable me to auto-update the IP
> > > address whenever it changes. The perl script's README says:
> > >
> > > "Execute dyn.pl: perl dyn.pl, or chmod +x dyn.pl and ./dyn.pl. You can also
> > >    reference it in your /etc/dhcpc/dhcpcd-eth0.exe file (This probably varies by
> > >    distro...YMMV) for automatic update when your IP address changes.
> > > "
> > >
> > > However, since Ubuntu uses dhcp3, I cannot use the above instruction.
> > >
> > > Can some kind soul please guide a newbie in setting this script up so
> > > that whenver the IP address assigned to me by the dhcp router, the
> > > script (dyn.pl) can be called/executed by dhcp3's dhclient. I see some
> > > directory called dhclient-enter-hooks.d in /etc/dhcp3/ I suspect I
> > > will have to use a script placed here, but have no clue how to
> > > proceed.
> > >
> > > A google search yields nothing, either.
> >
> > you can try putting a symlink to your updater (dyn.pl) in
> > /etc/dhcp3/dhclient-exit-hooks.d/
> >
> > It should get executed when dhclient is finished getting your ip
> > address.  But, that may not be best if you have multiple dhcp
> > interfaces...
> >
> Is there a way I can test whether this method will work now? I cannot
> force my ISP to give me a new IP, or can I? It would be bad if I
> counted on this working, and then one fine day when I am at work, it
> doesnt :)
>
> Thanks for the tip Daryl - I was thinking it was entry hooks, thanks
> for correcting me, and letting me know a symlink will do.
>

I think you can goto sh.nu and set your dyn host to a fake ip with the
form; then reconnect and see if the script updates properly.

--
~ Darryl  ~ smartssa at gmail.com
~ http://darrylclarke.com