How is it that I can ping between ESXi vmkernel interfaces with the sizes of package exceeding the value set in my passage upstream and one located in my vmkernel port group itself?
I have a 10 GB dell powerconnect 8024f the switch and the firmware is OLD, but the port config shows maximum frame size = 9000 to all cable ports
2 guests ESXi 5.5 wired, build 1331820, put each host computer network is managed by a single port dual qlogic 8150 ANC
When I connect to my windows VM to check my new 10 GB connectivity (it is configured for jumbo mtu = 9000 frames) and ping-l 8190 against ESXi vmkernel interface that was MTU of 1500, I get an answer without any packet loss... How can it be if the port is configured for only 1500 MTU? I thought that the two vmkernel port group and vswitch properties must have 9000 mtu defined, it appears that the vswitch properties override the port group properties.
But I know I must be missing something, a few important concepts, somewhere, because when I connect to ESXi via ssh I can ping devices with values greater than 8190 and not just windows virtual machines that reside on the same host where the ping uses the internal bus, but I am referring to the connections of the host of other ESXi on the switch management.
In summary - how the VMkernel does ping and response to pings of bigger sizes greater than the value of the switch upstream? and why do ping with large packets get answers when the vmkernel port group is always set at 1500, is this a bug or is this feature obsolete? I remember specifically in ESXi5 that I had to configure the vmkernel port group and the vswitch for this property to work.
Unless you specify "Don ' t fragment" (-f for Windows) you will be able to use any size package successfully.
For ESXi, take a look at Troubleshooting ESXi Jumbo Frames.
André
Tags: VMware
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