I attached an end of the Veth with separate network namespace. But I noticed that "@if11" is automatically added with my created Veth. Can anyone please explain it what is this?
if11 means that the other end of the
veth pair has the internal InterFace number 11, but as it isn't present in this network namespace, it has no name. So this name is used as a replacement.
If you create a veth pair in a single namespace (or the main namespace), you'll see