Re: [e-smith-devinfo] dyndns.org update behind NAT?

[Dub Dublin]

There's a nice little program called ddclient 
(http://burry.ca:4141/ddclient/)  that I've used to do this with a 
couple of different NAT boxes.  The configuration is easy, although 
AFAIK, no one has integrated it into the SME environment.  I use it with 
EasyDNS (highly recommended), but it also supports DynDNS.org, 
Hammernode, and Zoneedit, among others.

No matter - once you've set up the config file, it's really just a 
matter of putting it in crontab, or better yet, adding a line to 
/etc/dhcpc/dhcpcd-eth1.exe to run ddclient every time you get handed a 
different address.  (ddclient is smart enough to not even bother 
updating dynamic DNS if your IP address hasn't actually changed.)

The config file has commented-out examples for a many different NAT 
boxes, and a couple of generic examples that should be easily modifiable 
for most any NAT box with a web or telnet interface that will show you 
the far-side IP address.

At the time I started using it, ddclient was the only Dynamic DNS tool I 
could find that supported my somewhat obscure cable router.  That 
router, a SohoWare NBG-800, died recently and has since been replaced, 
but ddclient is so easy and troublefree I saw no reason to change it out 
for anything that's more tightly integrated into SME.  Using ddclient to 
handle dynamic DNS is a good choice - like SME server, it just works.  
Maybe I'll get the time someday to wrap ddclient up in a self-installing 
script for SME and post it on contribs.org, but such packaging is really 
not necessary.

Dub

Stephen Roach wrote:

maverick wrote:

Here's one for ya...

I'm testing a new cable modem for the local cable company (which I 
work for)
and it has built-in NAT - which there is no way around.  I have setup a
6.0b3 box to run behind it.  The problem is, seeing as how it (the
modem/router/wireless AP) runs NAT all of the time, and is giving a DHCP
address to the WAN interface on the SME box, how can I trick SME into 
still
figuring out the real routable IP of the cable modem and updating this
information (as it changes) with dyndns.org?

Any suggestions appreciated...

Thanks,
 Matt


I don't use an SME box but I have done it with Redhat using clients from:

https://www.dyndns.org/services/dyndns/clients.html

and this little trick from:

http://checkip.dyndns.org/

Which has worked well for me behind a D-link DSL-500 router using NAT.

Regards, Stephen.

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