The latest articles on DEV Community by S.Mohammad Emami Razavi (@emamirazavi). https://dev.to/emamirazavi https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F394656%2F1d743e19-587d-4ff5-82b4-49098d7d613e.jpeg https://dev.to/emamirazavi en S.Mohammad Emami Razavi Mon, 08 Jun 2020 04:16:32 +0000 https://dev.to/emamirazavi/how-to-set-metric-in-networkmanager-system-4525 https://dev.to/emamirazavi/how-to-set-metric-in-networkmanager-system-4525 <p>Sometimes we want to have several connections at the same time, one to the ethernet (wired lan) and one other to the wireless router, with two different gateways. In this documentation i describe how to make wireless connection prior to ethernet connection in each linux OS using NetworkManager service to moderate network connections. I've tested these instruction in fedora 31 already.</p> <h2> List your connections </h2> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code> [m.emami@home ~]$ nmcli connection NAME UUID TYPE DEVICE sample1 a16d1a96-2833-4876-a6c2-************ vpn wlp0s20f0u11 bevaght f46ba9ff-1114-4e79-9c8a-************ wifi wlp0s20f0u11 eth1 7648e3eb-c03f-46e9-b24e-************ ethernet enp2s0 </code></pre> </div> <h2> Edit the wireless connection </h2> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code>[m.emami@home ~]$ nmcli connection edit bevaght ===| nmcli interactive connection editor |=== Editing existing '802-11-wireless' connection: 'bevaght' Type 'help' or '?' for available commands. Type 'print' to show all the connection properties. Type 'describe [&lt;setting&gt;.&lt;prop&gt;]' for detailed property description. You may edit the following settings: connection, 802-11-wireless (wifi), 802-11-wireless-security (wifi-sec), 802-1x, ethtool, match, ipv4, ipv6, tc, proxy nmcli&gt; set ipv4.route-metric 10 nmcli&gt; save nmcli&gt; quit </code></pre> </div> <h2> Edit the ethernet connection </h2> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code>[m.emami@home ~]$ nmcli connection edit eth1 ===| nmcli interactive connection editor |=== Editing existing '802-3-ethernet' connection: 'eth1' Type 'help' or '?' for available commands. Type 'print' to show all the connection properties. Type 'describe [&lt;setting&gt;.&lt;prop&gt;]' for detailed property description. You may edit the following settings: connection, 802-3-ethernet (ethernet), 802-1x, dcb, sriov, ethtool, match, ipv4, ipv6, tc, proxy nmcli&gt; set ipv4.route-metric 2000 nmcli&gt; save nmcli&gt; quit </code></pre> </div> <h2> Restart NetworkManager service </h2> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code>[m.emami@home ~]$ sudo systemctl restart NetworkManager </code></pre> </div> <p>Congratulation! routes related to the WiFi connection (named <code>bevaght</code>) are prior to routes related to the Ethernet connection (named <code>eth1</code>)<br> </p> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code>[m.emami@home ~]$ route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.0.1 0.0.0.0 UG 10 0 0 wlp0s20f0u11 0.0.0.0 192.168.1.1 0.0.0.0 UG 2000 0 0 enp2s0 </code></pre> </div> networkmanager fedora nmcli metrics