I have tried to create tap interface (tap210i0) manually for kvm. But each time the Tun device shows NO-CARRIER.

I have interfaces eno1, eno2, vmbr0 and tap210i0. eno1 and eno2 are slaves for vmbr0.

Here are a set of command that I have tried.

ip tuntap add tap210i0 mode tap

ip link set dev tap210i0 up

brctl addif vmbr0 tap210i0

When I type "brctl show" it shows "tap210i0" as one of the interface together with eno1. I have google around but did not found any direct answer for my problem.

I believe I also have tap modules working.

lsmod | egrep -si tap 

output :

tap         24576    1 vhost_net

Note that all kind of firewall are disable. (including iptables)

Can anyone give me any working suggestion ? Please do not suggest me to restart the network as I can only access this server remotely. I could not go to the physical server to fix it.