bvstone

Updating DNS With Dynamic IP Addresses After a Router Reboot/Power Outage

Posted:

Updating DNS With Dynamic IP Addresses After a Router Reboot/Power Outage

About a year ago I wrote an article named Why I Cancelled my DynDNS Service and How I Replaced It with an IBM i Application.  

This article was how I wrote a few web service calls using GoDaddy APIs to check my current IP address and update them automatically if needed.  

Now that it is summer, thunderstorms are giving us power outages now and then.  While my IBM i and router are on a UPS (and also backed up with a generator) when the power flickers or goes out, it does cause a disconnect from our ISP which 99% of the time will result in an IP address refresh (yes, we're using a dynamic IP address... it's a long story).

What I noticed was while I was at home and this happened, even though I have a continuous job checking and updating my IP address ever couple hours I would need to go to my home office and call the program manually to get things reset so our website would still be available.  But what I also found is that I don't always have access to my office.  

So, because our local network is still available after a power outage, I wrote a small web service I can call from any PC, laptop or even mobile device to update our DNS from the comfort of where ever I happen to be. 

     H DFTACTGRP(*NO) BNDDIR('ERPGSDK')
      ****************************************************************
      * This is called CHECKDNSWS because if you call CHECKDNS it will try
      *  to call this program instead of the one in the GODADDY library.
      ****************************************************************
      ****************************************************************
      * Prototypes                                                   *
      ****************************************************************
      /COPY QCOPYSRC,P.ERPGSDK
      /COPY QCOPYSRC,P.LIBL
      *
     D CHECKDNS        PR                  EXTPGM
      ****************************************************************
     D i               S             10i 0
      ****************************************************************
      /free

       #pushlib('GODADDY');
       #pushlib('MAILTOOLBV');

       CHECKDNS();

       #poplib('GODADDY');
       #poplib('MAILTOOLBV');

       exsr $Return;
       //-------------------------------------------------------------/
       // Return                                                      /
       //-------------------------------------------------------------/
       begsr $Return;

         #startup();
         #writeTemplate('stdhtmlheader.erpg');
         #loadTemplate('message.erpg');
         #replaceData('/%msg%/':'CHECKDNS Called.');
         #writeSection();
         #cleanup();

         *INLR = *on;
         return;

       endsr;
      /end-free

So, as you can see, this program uses a GODADDY package that we created as well as the eRPG SDK.  We simply call the CHECKDNS program and return a message saying it has been called.  If the IP addresses are updated the IBM i sends an email and lets me know and things should be back to normal!  I simply made a bookmark that points to http://mylocalip/webservice/checkdns (which actually is routed to a program named CHECKDNSWS in my CGI library) and is available on any Chrome browser that I use, even my Pixel smartphone.

In fact, the program is so simple, I don't know why I didn't do this earlier, and all while not wearing a face covering!  Stay safe everyone!

 


Last edited 08/16/2020 at 12:00:28



Latest Posts:

SSL Handshake Errors with GETURI, MAILTOOL and GreenTools Products SSL Handshake Errors with GETURI, MAILTOOL and GreenTools Products
Posted by October 18, 2021
BVSTools >> BVSTools Software Discussion
MAILTOOL Updated to Retry Sending when GSK SSL Handshake Error 415 (GSK_ERROR_BAD_PEER) is Encountered MAILTOOL Updated to Retry Sending when GSK SSL Handshake Error 415 (GSK_ERROR_BAD_PEER) is Encountered
Posted by August 19, 2021
BVSTools >> BVSTools Announcements >> eMail Tool (MAILTOOL) Specific Announcements
MAILTOOL Updated to Allow List-Unsubscribe and User Defined Headers MAILTOOL Updated to Allow List-Unsubscribe and User Defined Headers
Posted by August 13, 2021
BVSTools >> BVSTools Announcements >> eMail Tool (MAILTOOL) Specific Announcements
AWS signing process in as400 AWS signing process in as400
Posted by August 13, 2021
Programming >> Web Programming
2022 License Price Increase and Consulting Update for Non-Software Specific Assistance 2022 License Price Increase and Consulting Update for Non-Software Specific Assistance
Posted by August 9, 2021
BVSTools >> BVSTools Announcements
Journaling the IFS, SPLTOOL and Java Journaling the IFS, SPLTOOL and Java
Posted by August 4, 2021
BVSTools >> BVSTools Announcements >> Spooled File Tools (SPLTOOL) Specific Announcements
G4MSMAIL Now Allows Wildcard Attachments G4MSMAIL Now Allows Wildcard Attachments
Posted by June 10, 2021
BVSTools >> BVSTools Announcements >> GreenTools for Microsoft Apps (G4MS) Specific Announcements
G4G Update for Uploading Large Files G4G Update for Uploading Large Files
Posted by May 28, 2021
BVSTools >> BVSTools Announcements >> GreenTools for G Suite (Google Apps) (G4G) Specific Announcements
Can We Purchase License Keys for More Than One Year at a Time? Can We Purchase License Keys for More Than One Year at a Time?
Posted by May 21, 2021
BVSTools >> BVSTools Announcements
JOBWATCH 5.10 Released with New Feature to Monitor CPU Percentages JOBWATCH 5.10 Released with New Feature to Monitor CPU Percentages
Posted by May 10, 2021
BVSTools >> BVSTools Announcements >> Job Watch (JOBWATCH) Specific Announcements
Iseries Access data transfer Iseries Access data transfer
Posted by April 29, 2021
IBM Power Systems >> (QGPL) IBM i
YAJL - Parsing YAJL - Parsing
Posted by April 4, 2021
Programming >> RPG Programming
Create LPAR partition and install OS Create LPAR partition and install OS
Posted by March 24, 2021
IBM Power Systems >> (QGPL) IBM i
G4MS Now Allows User/Password Authentication Option G4MS Now Allows User/Password Authentication Option
Posted by March 16, 2021
BVSTools >> BVSTools Announcements >> GreenTools for Microsoft Apps (G4MS) Specific Announcements
IPDS printer file using CHRSIZ IPDS printer file using CHRSIZ
Posted by February 25, 2021
Programming >> RPG Programming

Reply




Copyright 1983-2020 BVSTools
GreenBoard(v3) Powered by the eRPG SDK, MAILTOOL Plus!, GreenTools for Google Apps, jQuery, jQuery UI, BlockUI, CKEditor and running on the IBM i (AKA AS/400, iSeries, System i).