Dynamic IP Address workaround

[Szilveszter Ciurdar]

I've had the same problem as most ISPs provide a dynamic IP address to
cable and DSL modems. 
That means your public IP address at home can
change.  The solution is to set up a domain name where you can reach
your router from the public internet using a free service such as  DynDNS.   Go to http://www.dyndns.com/ and sign up for a free
account.  -Once you create an account and login, go to the My Services
page and select Add Host Service.  

-Enter a hostname. 
This will be your domain name that you use to access your home network
from the public internet.  

-Fill in the IP address from the
status page of your router configuration page. 


-Click on add host and you are done here.

 

Now go back into your router's control panel and find the Dynamic DNS section.
*If your router is missing this, it's time to look into buying a new one.
-Under the Setup tab click on the DDNS tab

-Select DynDNS.org

-Fill in your username and password for your dyndns account. 

-Enter the dyndns hostname you
created.

-Save Settings.  Now
whenever your IP address changes, your router will
automatically update the information in your dyndns
account.  

-If you go to a command line and ping your dyndns host name. 
You should now see the same IP address as the
router shows.P.S.  My router is the Linksys WRT54GL flashed with DD-WRT.  It comes with OpenSSH and I configured public-key encryption which means that I can connect to my home network to browse the internet from anywhere with an internet connection (public wi-fi) without leaving a *nix server running all-the time behind my router.

> Date: Thu, 20 Dec 2007 23:23:54 -0500
> From: gwb3 at Lehigh.EDU
> To: openbsd-newbies at sfobug.org
> Subject: Dynamic IP Address workaround
> 
> OpenBSD box (static IP address) sits behind a Wireless DSL router that
> receives a dynamic IP address from ISP.
> I'm thinking that if the box sends an email to my externally hosted
> email address every few hours I can always refer to the most recent
> email received (specifically it's headers) to know what my IP address is
> while away from home.
> 
> Question:
>     1. Is there an easier way to always know my dynamic IP address?
>     2. If this is a feasible solution, is there a program that can
> configured to send a template email to a specific address every hour or so?
>     3. Is this something that cron needs to become involved with?
> 
> Any advice is much appreciated.
> Thanks
> -gb
> 
> 
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