Internet not working after VLAN configuration

[Shyam1]

Hi , 

    We have a Fortigate 90E , when i try to create a new VLAN configuration in any one of the physical interface , i'm not able to get internet while directly connecting the port and laptop with a working ethernet cable. Anyone has faced this issue ?

[mnovelli]

If you configure a Vlan on a physical interface and then connect a PC to that interface, you need to configure vlan tag too on PC, otherwise it will not works.

[Shyam1]

hi thanks for the reply , can you please guide me on how to configure vlan tag on PC . i'm a bit confused on how to do it.

[funkylicious]

Hi, you can look at this, but probably you would need the network drivers installed from the manufacturer of the nic.

https://www.startech.com/en-dk/faq/vlan-tagging-network-card-windows?srsltid=AfmBOopWq5oAJ45JuNz_5i3...

L.E. Are you trying to create a interface on the FortiGate with a vlan id/tag ? If so, please make sure that the port in the switch is configured in trunk and that vlan is allowed on the port where you are connecting the FortiGate.

[ebilcari]

If you plan to use the tagged VLANs on Hyper-V guest VMs, there are some PowerShell commands that can help convert the interface to trunk and allow a list of VLAN, something like this:

Set-VMNetworkAdaptervlan -VMName FGW-VM1 -VMNetworkAdapterName "Adap4" -Trunk -AllowedVlanIdList "511-514" -NativeVlanId 0

If you have a secondary NIC in the PC and it supports VLAN tagging it will have this field in Configuration options: