Comment 20 for bug 1805920

I have not tried Centos6 VMs.

The customer reported that he deployed Centos7 to the baremetal blades and saw, in ping traffic that incoming packets were vlan 0 tagged.

Then he deployed Centos6 to two baremetal blades and, in a ping test, did not see any vlan tags.

If this is true, it suggests Ubuntu 18.04 and Centos 7 either add the vlan 0 tag or fail to remove it (if it's added by something else). Conversely, Centos 6 either doesn't add the tag or succeeds in removing it.

I did not ask the customer to replicate the scenario of a kvm instance PXE booting on top of the Centos deployment from a DHCP server on a different blade. And I do not have access to test that scenario myself. Another test I'd like to see the results of are ping tests between Ubuntu 18.04 and Centos 6 -- to see which side, if any, sees the vlan 0 tag.