{"id":2093,"date":"2025-06-16T11:12:00","date_gmt":"2025-06-16T11:12:00","guid":{"rendered":"https:\/\/www.ucartz.com\/blog\/?p=2093"},"modified":"2025-06-17T07:10:14","modified_gmt":"2025-06-17T07:10:14","slug":"troubleshooting-the-viifbr0-is-not-started-please-run-systemctl-start-virtnetwork-error-in-virtualizor","status":"publish","type":"post","link":"https:\/\/www.ucartz.com\/blog\/troubleshooting-the-viifbr0-is-not-started-please-run-systemctl-start-virtnetwork-error-in-virtualizor\/","title":{"rendered":"How to Fix the &#8216;viifbr0 is not started error in Virtualizor"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Introduction<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When managing KVM or Xen VPS hosts with Virtualizor, you may encounter the following error when trying to start or restart a virtual machine:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><code>The viifbr0 is not started. Please run systemctl start virtnetwork<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">This message indicates that the Linux bridge interface (<code>viifbr0<\/code>) which ties your VPS network adapters to the host\u2019s physical NIC is either missing or down. In this post, we\u2019ll walk through how we diagnosed the problem, why the recommended \u201cstart\u201d command failed, and how we ultimately fixed it.It means the bridge interface&nbsp;viifbr0 which connects your VPS network to the host\u2019s NIC is missing or down.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Error Description<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">On the Virtualizor admin dashboard (or when creating\/restarting a VPS), Virtualizor invokes its helper service,&nbsp;<strong>Virtnetwork<\/strong>, to bring up&nbsp;<code>viifbr0<\/code>. If that bridge isn\u2019t present, you\u2019ll see:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><code>The viifbr0 is not started. Please run systemctl start virtnetwork<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">By default, Virtnetwork expects the primary network interface to be labeled as eth0. If your system uses a different name (for example,&nbsp;<code>eno1<\/code>), the service cannot bind the bridge and will exit without erroring out loudly.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 1: Follow the Official FAQ<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.virtualizor.com\/docs\/faq\/panel-is-offline\/\" target=\"_blank\" rel=\"noreferrer noopener\">Virtualizor\u2019s documentation<\/a> advises:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Install the&nbsp;<code>bridge-utils<\/code>&nbsp;package.<\/li>\n\n\n\n<li>In the Admin panel, navigate to Configuration \u2192 Slave Settings \u2192 Network Interface and verify that the appropriate network interface card (NIC) is chosen (typically eth0 by default).<\/li>\n\n\n\n<li>then go to the terminal as root and use below command. <\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-preformatted\"><code>service virtnetwork start<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">However, when your NIC isn\u2019t\u00a0<code>eth0<\/code>, the start command won\u2019t succeed or work.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 2: Initial \u201cstart\u201d Attempt<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">On our host, we ran:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><code>  systemctl status virtnetwork<\/code><br><code><br>virtnetwork.service \u2014 active (exited)<br>   \u2026<br>   bridge[2791]: Interface : eth0<br>   bridge[2791]: Error: No IP address found.<br><\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Because our server\u2019s actual interface was&nbsp;<code>eno1<\/code>, Virtnetwork looked for&nbsp;<code>eth0<\/code>, found nothing, and exited without bringing up&nbsp;<code>viifbr0<\/code>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 3: Correct the Network Interface in Virtualizor<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><br><strong>Discover your host\u2019s network interfaces<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ip link show<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">This lists every interface on your node. Identify which one carries your public IP (e.g., eno1, ens3, etc.).  For example:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><pre class=\"wp-block-preformatted\"><code> 2: eno1: &lt;BROADCAST,MULTICAST,UP,LOWER_UP&gt; mtu 1500 ...<\/code><\/pre><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Update the bridge mapping in Virtualizor<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Log in to the Virtualizor Admin panel.<\/li>\n\n\n\n<li>Navigate to&nbsp;<strong>Configuration \u2192 Slave Settings<\/strong>&nbsp;(select your server).<\/li>\n\n\n\n<li>Under&nbsp;<strong>Network Interface<\/strong>, For the node in question, replace the default&nbsp;<code>viifbr0<\/code>&nbsp;value with your actual interface name (e.g.,&nbsp;<code>eno1<\/code>).<\/li>\n\n\n\n<li>Click&nbsp;<strong>Save<\/strong>.<br><br>This aligns Virtnetwork with the host\u2019s real NIC name.<br><\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Step 4: Restart the Virtnetwork Service<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Rather than a simple \u201cstart,\u201d issue a&nbsp;<strong>restart<\/strong>&nbsp;so the service picks up the new interface mapping:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><code>systemctl restart virtnetwork<\/code><br><code><br>Jun 15 16:10:13 host bridge[54021]: Interface : eno1<\/code><br><code><br>Jun 15 16:10:13 host bridge[54021]: Bringing up viifbr0 - OK<\/code><br><code><br>Jun 15 16:10:13 host bridge[54021]: Internet connectivity check successful viifbr0 - OK<br><\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">You\u2019ll now see that&nbsp;<code>viifbr0<\/code>&nbsp;has been created and brought up on top of&nbsp;<code>eno1<\/code>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 5: Verify and Relaunch Your VPS<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Confirm the bridge is up:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><code>ip addr show viifbr0<br>4: viifbr0: &lt;BROADCAST,MULTICAST,UP,LOWER_UP&gt; mtu 1500 \u2026<br>    inet 23.239.106.114\/29 brd 23.239.106.119 scope global viifbr0<br><\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Finally, restart (or create) your VPS:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><code>vzctl restart &lt;VMID&gt;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">or via the Virtualizor UI. The \u201cbridge not found\u201d error should now be resolved.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">If you see the&nbsp;<code>viifbr0 not started<\/code>&nbsp;error in Virtualizor:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Ensure<\/strong>&nbsp;<code>bridge-utils<\/code>&nbsp;is installed and the proper NIC is selected in&nbsp;<strong>Slave Settings<\/strong>.<\/li>\n\n\n\n<li><strong>Restart<\/strong>&nbsp;the&nbsp;<code>virtnetwork<\/code>&nbsp;service (not just start).<\/li>\n\n\n\n<li><strong>Verify<\/strong>&nbsp;the new bridge interface is up.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">With these steps, Virtnetwork will correctly bind your physical NIC regardless of its name and your Virtualizor-managed VPS instances will start without issue.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction When managing KVM or Xen VPS hosts with Virtualizor, you may encounter the following error when trying to start or restart a virtual machine: The viifbr0 is not started. Please run systemctl start virtnetwork This message indicates that the Linux bridge interface (viifbr0) which ties your VPS network adapters to the host\u2019s physical NIC [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":2100,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[400],"tags":[394,192,459,515,74],"class_list":["post-2093","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tutorials","tag-linux","tag-server","tag-troubleshooting","tag-virtualizor","tag-vps-hosting"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Fix the &#039;viifbr0 is not started error in Virtualizor - Web Hosting and IT Consultancy Services<\/title>\n<meta name=\"description\" content=\"Fix &#039;viifbr0 is not started&#039; Virtualizor error! 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