Connecting a Domain to a Network with a Changing IP using Dynamic DNS (Linux)

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var OAO = OAO || {}; OAO.q = OAO.q || {}; OAO.q.pageintegration = OAO.q.pageintegration || []; </script> <div class="page-content"> <div class="oao-navi-navigation oao-navi-light" xmlns:f="http://www.w3.org/1999/html"> <div class="oao-navi-left"> <div class="oao-navi-application-name"> <a class="oao-navi-app-name" href="https://www.ionos.com/help/"> <span class="oao-navi-app-logo"></span> <span> Help Center </span> </a> </div> </div> </div> <main id="content" class="clearfix knowledge" data-iframe-height=""> <a class="skip-target" name="skip-to-content"></a> <header class="page-header page-header--narrow"> <div class="page-header__block"> <div class="breadcrumb"> <a href="/help/" class="breadcrumb__item">Home</a> <a href="/help/domains/" class="breadcrumb__item">Domains</a> <a href="/help/domains/dns-settings/" class="breadcrumb__item">DNS Settings</a> </div> <h1 class="page-header__headline">Connecting a Domain to a Network with a Changing IP using Dynamic DNS (Linux)</h1> </div> </header> <div class="page-section page-section--narrow has-sticky-sidebar"> <div class="page-section__block"> <div class="grid"> <div class="grid-col grid-col--8 grid-col--medium-12 grid-col--small-12 grid-col--article"> <div class="sheet"> <section class="sheet__section sheet__section--activating" style="display: none;" id="displayDownloadPdfHint"> <p class="lead-paragraph">Please use the “Print” function at the bottom of the page to create a PDF.</p> </section> <section class="sheet__section"> <div class="ce-textpic ce-center ce-above"><div class="ce-bodytext"><p class="content-paragraph">A static IP address is usually required so that a computer, a home network, or a small company network can always be reached through the Internet under the same host name. This is also necessary if you want to connect to your home network using a VPN, for example. However, if your home network or small business network is connected to the Internet through certain types of connections like DSL, a new (dynamic) IP address is regularly assigned to the network. As a result, the computer, home network, or small business network cannot be permanently reached using the IP address.</p><p class="content-paragraph">In this case, you can use <strong>Dynamic Domain Name System (DNS)</strong> to automatically update the constantly changing IP addresses in the domain's DNS record so that your home network is permanently accessible under your domain.</p><p class="content-paragraph">To use the <strong>Dynamic DNS</strong>, you can use the multi-platform client from IONOS. This multi-platform client was written in Python.</p><p class="content-paragraph">The following describes the steps required to use the multi-platform client:</p></div></div> </section> <section id="c112043" class="sheet__section "> <a class="in-page-anchor" id="c112044"></a><h3 class="headline headline--sub"> Installing Python on a Computer Running Ubuntu </h3><div class="ce-textpic ce-center ce-above"><div class="ce-bodytext"><p class="content-paragraph">The following step-by-step instructions will show you how to install <strong>Python</strong> on a computer running the Ubuntu operating system.</p><h5 class="headline headline--paragraph">Check for the Installation</h5><ul class="content-list ordered-list"><li class="content-paragraph"><p class="content-paragraph">Check whether Python is already installed. To do this, enter the following command:</p><p class="code-snippet">python --version</p></li><li class="content-paragraph"><p class="content-paragraph">To check if pip is installed correctly, enter the following command:</p><p class="code-snippet">pip --version</p></li></ul><h5 class="headline headline--paragraph">Install Python</h5><ul class="content-list ordered-list"><li class="content-paragraph"><p class="content-paragraph">To install Python 3.x, enter the following commands.</p><p class="code-snippet">sudo apt update<br> sudo apt upgrade<br> sudo apt install software-properties-common<br> sudo apt-get install python3</p></li><li class="content-paragraph"><p class="content-paragraph">To install pip, enter the following command:</p><p class="code-snippet">apt install python-pip</p></li></ul></div></div> </section> <section id="c112047" class="sheet__section "> <a class="in-page-anchor" id="c112048"></a><h3 class="headline headline--sub"> Installing the Multi-Platform Client </h3><div class="ce-textpic ce-center ce-above"><div class="ce-bodytext"><ul class="content-list ordered-list"><li class="content-paragraph"><p class="content-paragraph">To install the multi-platform client, enter the following command:</p><p class="code-snippet">pip install domain-connect-dyndns</p></li><li class="content-paragraph"><p class="content-paragraph">To add the domain whose DNS settings are to be updated automatically, type the following command:</p><p class="code-snippet">domain-connect-dyndns setup --domain NAME_OF_THE_DOMAIN</p><p class="content-paragraph"> Example:</p><p class="code-snippet">domain-connect-dyndns setup --domain example.com </p></li><li class="content-paragraph"><p class="content-paragraph">Copy the URL and paste it into your browser.</p></li><li class="content-paragraph"><p class="content-paragraph">Log in to IONOS.</p></li><li class="content-paragraph"><p class="content-paragraph">Click <span class="control-element">Allow</span>.</p></li><li class="content-paragraph"><p class="content-paragraph">Make a copy of the code displayed.</p></li><li class="content-paragraph"><p class="content-paragraph">Open the command prompt and enter the code.</p></li><li class="content-paragraph"><p class="content-paragraph">To update all domains, type the following command:</p><p class="code-snippet"> domain-connect-dyndns update --all</p><p class="content-paragraph"> For example, after entering the command, the following message appears:</p><p class="code-snippet">[root@localhost ~]# domain-connect-dyndns update --all<br> Read example.com config.<br> IP 217.160.25.20 found in A record<br> New IP: 217.160.25.20<br> A record up to date.</p></li><li class="content-paragraph"><p class="content-paragraph">For the IP address to be updated regularly in the DNS record, a cronjob must be configured. To edit the crontab file, type the following command:</p><p class="code-snippet"> crontab -e</p></li></ul></div></div> </section> <section id="c112049" class="sheet__section sheet__section--neutral"> <div class="ce-textpic ce-center ce-above"><div class="ce-bodytext"><h5 class="headline headline--paragraph">Please Note</h5><ul class="content-list bullet-list"><li class="content-paragraph"><p class="content-paragraph"><strong>Cron jobs</strong> are executed by the <strong>Cron-Deamon</strong>. The Cron-Deamon is a service with which you can execute time-based scripts and programs. The commands to be executed are stored in a table, which is called <strong>Crontab</strong>.</p></li><li class="content-paragraph"><p class="content-paragraph">Information on editing and building the crontab file and syntax can be found in the article Cron.</p></li></ul></div></div> </section> <section id="c112051" class="sheet__section "> <div class="ce-textpic ce-center ce-above"><div class="ce-bodytext"><ul class="content-list ordered-list ordered-list-reset-9"><li class="content-paragraph"><p class="content-paragraph">Insert the cron job below:</p><p class="code-snippet">*/1 * * * * /usr/bin/flock -n /tmp/ipupdate.lck /usr/local/bin/domain-connect-dyndns update --all --config /root/dyndns/settings.txt</p></li></ul></div></div> </section> <hr class="sheet__separator survey" /> <section class="sheet__section sheet__section--secondary"> <script type="text/javascript" id="oao_feedback_script"> var OAO = OAO || {}; OAO.q = OAO.q || {}; OAO.q.ias = OAO.q.ias || []; OAO.q.ias.push(['setApplication', "HELP_CENTER"]); 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Connecting a Domain to a Network with a Changing IP using Dynamic DNS (Linux) - IONOS Help