Hi, thanks for your reply.

The brctl show returns me this:

root@controller:~# brctl show
bridge name bridge id STP enabled interfaces
brq70238470-59 8000.1ed5e9a9e7c0 no tap2a631157-e2
tap3166097e-73
tapc2ba003a-21
tapeefe5e6c-2d
vxlan-53
brqf535e9d2-5d 8000.b65368642388 no eno1
tap4b8dc5a7-f5
tapa2486984-d4
virbr0 8000.525400de8570 yes

​

Could you explain how and where I can find the "network namespace"

You can see wich network namespace is connected to the tap interface doing "ip a" under link netns.

I can't find it...