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    <title>topic Re: MTU 9000 in vSphere™ vNetwork Discussions</title>
    <link>https://communities.vmware.com/t5/vSphere-vNetwork-Discussions/MTU-9000/m-p/2929718#M14587</link>
    <description>&lt;P&gt;Yes, i agree&lt;BR /&gt;&lt;BR /&gt;but if I configure vmkernel and physical adapter as MTU 9000 and vSwitch as MTU 1500. will it cause communication problems?&lt;/P&gt;</description>
    <pubDate>Tue, 20 Sep 2022 11:27:14 GMT</pubDate>
    <dc:creator>mak14</dc:creator>
    <dc:date>2022-09-20T11:27:14Z</dc:date>
    <item>
      <title>MTU 9000</title>
      <link>https://communities.vmware.com/t5/vSphere-vNetwork-Discussions/MTU-9000/m-p/2928540#M14584</link>
      <description>&lt;P&gt;Dear Community,&lt;/P&gt;&lt;P&gt;i set vmkernel 9000 and vDS standard switch 1500 and Physical switch set to 9000 is this configuration supported or it will create network issues&lt;/P&gt;</description>
      <pubDate>Tue, 13 Sep 2022 07:30:18 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/vSphere-vNetwork-Discussions/MTU-9000/m-p/2928540#M14584</guid>
      <dc:creator>mak14</dc:creator>
      <dc:date>2022-09-13T07:30:18Z</dc:date>
    </item>
    <item>
      <title>Re: MTU 9000</title>
      <link>https://communities.vmware.com/t5/vSphere-vNetwork-Discussions/MTU-9000/m-p/2928670#M14585</link>
      <description>&lt;P&gt;The MTU needs to be configured from end to end, i.e. also in the vSwitch.&lt;BR /&gt;You can test whether MTU 9000 works using the &lt;EM&gt;vmkping&lt;/EM&gt; command from one of the ESXi hosts.&lt;/P&gt;
&lt;PRE&gt;vmkping -I vmk# -d -s 8972 &amp;lt;target-ip&amp;gt;&lt;/PRE&gt;
&lt;P&gt;André&lt;/P&gt;</description>
      <pubDate>Tue, 13 Sep 2022 16:42:19 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/vSphere-vNetwork-Discussions/MTU-9000/m-p/2928670#M14585</guid>
      <dc:creator>a_p_</dc:creator>
      <dc:date>2022-09-13T16:42:19Z</dc:date>
    </item>
    <item>
      <title>Re: MTU 9000</title>
      <link>https://communities.vmware.com/t5/vSphere-vNetwork-Discussions/MTU-9000/m-p/2929718#M14587</link>
      <description>&lt;P&gt;Yes, i agree&lt;BR /&gt;&lt;BR /&gt;but if I configure vmkernel and physical adapter as MTU 9000 and vSwitch as MTU 1500. will it cause communication problems?&lt;/P&gt;</description>
      <pubDate>Tue, 20 Sep 2022 11:27:14 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/vSphere-vNetwork-Discussions/MTU-9000/m-p/2929718#M14587</guid>
      <dc:creator>mak14</dc:creator>
      <dc:date>2022-09-20T11:27:14Z</dc:date>
    </item>
    <item>
      <title>Re: MTU 9000</title>
      <link>https://communities.vmware.com/t5/vSphere-vNetwork-Discussions/MTU-9000/m-p/2929722#M14588</link>
      <description>&lt;P&gt;YES... it will cause problem because the VMK try to use a packet size up to 9k but it will blocked or need to defragmented.&lt;/P&gt;&lt;P&gt;If you have CEIP enabled the VMware Advisor within vCenter will raise an alarm also about mismatched MTU settings.&lt;/P&gt;&lt;P&gt;Regards,&lt;BR /&gt;Joerg&lt;/P&gt;</description>
      <pubDate>Tue, 20 Sep 2022 11:50:07 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/vSphere-vNetwork-Discussions/MTU-9000/m-p/2929722#M14588</guid>
      <dc:creator>IRIX201110141</dc:creator>
      <dc:date>2022-09-20T11:50:07Z</dc:date>
    </item>
    <item>
      <title>Re: MTU 9000</title>
      <link>https://communities.vmware.com/t5/vSphere-vNetwork-Discussions/MTU-9000/m-p/2929875#M14589</link>
      <description>&lt;P&gt;But for below configuration&lt;BR /&gt;&lt;SPAN&gt;configure vmkernel and physical adapter as MTU 9000 and vSwitch as MTU 1500.&lt;BR /&gt;&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN&gt;Does vSwitch does de-fragmentation&amp;nbsp;or simply&amp;nbsp;it will fail to send frames.&amp;nbsp;&lt;BR /&gt;&lt;BR /&gt;When i was migrating&amp;nbsp;standard switch to Distributed&amp;nbsp;switch. Accidently&amp;nbsp;DS switch MTU was set to 1500 and When i migrated vSAN VM kernel i lost connection and VMs were shut down. i was trying to figure out is it because of MTU 1500?&amp;nbsp;&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;logs&lt;BR /&gt;&lt;SPAN&gt;2022-09-12T12:05:12.655Z cpu2:3987430)Uplink: 5942: vmnic4: TSO packet has large MSS (8948) plus L7 offset (66), which can't be fit into MTU (1500)&lt;/SPAN&gt;&lt;BR /&gt;&lt;SPAN&gt;2022-09-12T12:05:12.655Z cpu0:3987430)Uplink: 5942: vmnic4: TSO packet has large MSS (8948) plus L7 offset (66), which can't be fit into MTU (1500)&lt;/SPAN&gt;&lt;BR /&gt;&lt;SPAN&gt;2022-09-12T12:05:12.655Z cpu0:3987430)Uplink: 5976: vmnic4: Non TSO L2 payload size exceeds uplink MTU. FrameLen: 3134, L3 header offset: 14&lt;/SPAN&gt;&lt;/P&gt;</description>
      <pubDate>Wed, 21 Sep 2022 09:35:06 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/vSphere-vNetwork-Discussions/MTU-9000/m-p/2929875#M14589</guid>
      <dc:creator>mak14</dc:creator>
      <dc:date>2022-09-21T09:35:06Z</dc:date>
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