Add VLAN to virtual interface in Ubuntu?

Question

Computer networks

Is it possible to add a VLAN to a virtual interface in Ubuntu?
I try
sudo vconfig add eth0:1 20
answer
No such device.
It turns out that VLANs can only be added to physical interfaces?

Answer 1

VLAN can only be assigned to a physical ethernet interface.
eth0:1 is just an alias, an additional address over the main one.

Answer 2

Rather, the problem is that vlan 1, according to the standard, cannot be hung on a package.
Here's what I do (not Ubuntu, but I don't think it makes a difference):
vconfig add enp3s0f0 10
ifconfig enp3s0f0.10 up
vconfig add enp3s0f0.10 100
ifconfig enp3s0f0.10.100 up
ip addr
8: [email protected]: mtu 1500 qdisc noqueue state UP
link/ether 00:e0:ed:12:37:b6 brd ff:ff:ff:ff:ff:ff
inet6 fe80::2e0:edff:fe12:37b6/64 scope link
valid_lft forever preferred_lft forever
9: enp3s0f0 [email protected]: mtu 1500 qdisc noqueue state UP
link/ether 00:e0:ed:12:37:b6 brd ff:ff:ff:ff:ff:ff
inet6 fe80::2e0:edff:fe12:37b6 /64 scope link
valid_lft forever preferred_lft forever
Everything is added great
But what happens when you try to create vlan 1:
vconfig add enp3s0f0 1
Added VLAN with VID == 1 to IF -:enp3s0f0:-
WARNING: VLAN 1 does not work with many switches,
another number consider if you have problems.
However:
ifconfig enp3s0f0.1 up
vconfig add enp3s0f0.1 20
ifconfig enp3s0f0.1.20 up
ip addr
10: [email protected]: mtu 1500 qdisc noqueue state UP
link/ether 00:e0:ed:12:37:b6 brd ff :ff:ff:ff:ff:ff
inet6 fe80::2e0:edff:fe12:37b6/64 scope link
valid_lft forever preferred_lft forever
11: [email protected]: mtu 1500 qdisc noqueue state UP
link/ether 00:e0:ed:12:37:b6 brd ff:ff:ff:ff:ff:ff
inet6 fe80::2e0:edff: fe12:37b6/64 scope link
valid_lft forever preferred_lft forever
There are interfaces. If you are sure of the correct syntax, this may already be an Ubuntu limitation.