Arduino ethernet based web server to control instruments over internet

I use a dynamic service from zoneedit with a couple domains that I own and run on a local linux server.

I have a cron job checking my IP address every hour.

If it changes I can update it via wget which simply updates my ZoneEdit DNS records through a simple URL.

First: I use this URL to check my current IP 'http://checkip.dyn.com/'.

Second: Compare the current IP to what it was before.

Third: If it is different then I use this wget command to update the dynamic record:

"wget -O - --http-user=YOUR_ZONEEDIT_USERNAME --http-passwd=YOUR_ZONEEDIT_PASSWORD 'https://dynamic.zoneedit.com/auth/dynamic.html?host=YOUR_ZONEEDIT_DOMAIN&zones=YOUR_ZONEEDIT_ZONE' "

I know your trying to do this with just the Arduino but I'm betting there is some way to authenticate with the ZoneEdit service.

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Note: I don't work or have any affiliation with ZoneEdit but I really do love the freedom they provide for this kind of stuff.

Hey,

I just did that sort of thing to make a web controlled cat feeder (using arduino and a motor).
I have a TP-Link router which can login to a dynamic DNS service such as dyndns or no-ip.com.
you can get free accounts and free domains there and hook them to your external IP using a router or a small software on the PC (they supply it as far as i remember).
That way you can plug your arduino straight to the router, port forward it and hot the webserver on it + have easy access.men

word of advice, if for some reason you let someone else know your domain name you can simply (but it's not that secured) hide it by using a different port than port 80 (select it in the arduino software and forward that port in the router. than you can get to it like this: http://www.google.com:1234 (if your port number is 1234).!

Good luck!

btw: heres a video of my project http://youtu.be/z7nMl2i_rlw (It's in hebrew but i guess youll understand what it does anyway)

HI. You can use Dyndns to have a dinamic DNS service for free and you can interface the instruments to Arduino using Labview.

Ziv's idea about using the Dynamic DNS client built into your router has great merit.  Check in the router configuration. Some only work with one or two dynamic DNS services.  Then you can decide which dynamic DNS service to set up an account with. Most of the free services require that you monthly renew your account. I finally gave that up and went with a $12/yr service. 

i have dynamic ip so how can i update my ip to dynamicdns website?

You can use one of the service that give you a Domain Name to your IP and dinamically update the Domain Name Server routing tables associating your dinamic IP with the domanin name they gave you.