# Loopback

Loopback ICE candidates, which are skipped unless allowed.

### webrtc.loopback.allowLoopback()

Alias for [`allow_loopback()`](#webrtc.loopback.allow_loopback)

### webrtc.loopback.allow_loopback()

Gathers loopback candidates too, for peers on one machine. Same as `WRTC_ALLOW_LOOPBACK=1`.

* **Raises:**
  [**webrtc.InvalidStateError**](exceptions.md#webrtc.exceptions.InvalidStateError) – If a connection or an ICE transport was created already.