Hi,
Created a VM with CentOS 7.0. Configured the VLAN in the properties of the network adapter. I log on to this VM over ssh and get the upload\download speed of about 0.5 MB\s (Internet channel 500 MB\s, network adapter 1 GB\s). I disable the VLAN and the speed increases to 400 MB\s.
What is the problem with low network speed when the VLAN is enabled?