Ask the Community
Groups
How to enable jumbo frames - Connect IT Community | Kaseya
<main> <article class="userContent"> <h2 data-id="summary"><strong>SUMMARY</strong></h2> <p>Steps needed to enable jumbo frames on appliances</p> <h2 data-id="issue"><strong>ISSUE</strong></h2> <p>Client wants to enable jumbo frames on <b>eth1</b><br><br>eth1 Link encap:Ethernet HWaddr AB:CD:EF:01:23:45<br> inet addr:192.168.9.240 Bcast:192.168.9.255 Mask:255.255.255.0<br> inet6 addr: fe80::ae1f:6bff:fe40:ed5c/64 Scope:Link<br> UP BROADCAST RUNNING MULTICAST <b>MTU:1500</b> Metric:1<br> RX packets:1597659 errors:0 dropped:0 overruns:0 frame:0<br> TX packets:294545 errors:0 dropped:0 overruns:0 carrier:0<br> collisions:0 txqueuelen:1000<br> RX bytes:1838042722 (1.7 GiB) TX bytes:76402917 (72.8 MiB)</p> <h2 data-id="resolution"><strong>RESOLUTION</strong></h2> <p><b>NOTE: In the example below, we will be editing values for ETH1</b><br><br>You will need to add the line item MTU=9000 to the appropriate ifcfg-eth file located at /etc/sysconfig/network-scripts, and ensure the ONBOOT value is yes<br> </p> <h2 data-id="tasks"><strong>TASKS</strong></h2> <p></p> <ol><li> <b>Execute this command:</b> <b> </b><b>vi /etc/sysconfig/network-scripts/ifcfg-eth1</b> </li></ol><pre class="code codeBlock" spellcheck="false" tabindex="0"> DEVICE=eth0 TYPE=Ethernet ONBOOT=yes NM_CONTROLLED=yes BOOTPROTO=none GATEWAY=192.168.9.1 NETMASK=255.255.255.0 IPADDR=192.168.9.240 METRIC=0</pre> <ol start="2"><li><b>Add the line MTU=9000 (below TYPE=Ethernet is fine) and set the ONBOOT=yes</b></li></ol><pre class="code codeBlock" spellcheck="false" tabindex="0"> DEVICE=eth0 TYPE=Ethernet <b>MTU=9000</b> <b>ONBOOT=yes</b> NM_CONTROLLED=yes BOOTPROTO=none GATEWAY=192.168.9.1 NETMASK=255.255.255.0 IPADDR=192.168.9.240 METRIC=0</pre> <ol start="3"><li> <b>Now restart the network services by issuing this command:</b> <b>service network restart</b> </li> <li><b>Execute this command to show the interfaces: ifconfig</b></li> <li> <b>If you do not see the interface eth1, execute this command to start it:</b> <b>ifup eth1</b> </li> <li> <b>Check the status of the interfaces again:</b> <b>ifconfig</b> </li> <li><b>Successful output should look like:</b></li> </ol><pre class="code codeBlock" spellcheck="false" tabindex="0"> eth1 Link encap:Ethernet HWaddr AB:CD:EF:01:23:45 inet addr:192.168.9.240 Bcast:192.168.9.255 Mask:255.255.255.0 inet6 addr: fe80::ae1f:6bff:fe40:ed5c/64 Scope:Link UP BROADCAST RUNNING MULTICAST <b>MTU:9000</b> Metric:1 RX packets:1597659 errors:0 dropped:0 overruns:0 frame:0 TX packets:294545 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1838042722 (1.7 GiB) TX bytes:76402917 (72.8 MiB)</pre> </article> </main>