IGMPProxy
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You can find the IGMPProxy Settings at **Services → IGMPProxy**.

.. image:: img/Services-IGMP.png
    :width: 100%
    :align: center
    :alt: IGMPProxy

The **IGMPProxy** is used to propagate multicasts across L2s.

Before you can use the IGMPProxy it has to be installed. You can install it at **System → Addons**.

Upstream
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On the page the IGMPProxy can be enabled or disabled.

**Interface** sets the interface. This interface can not be used as Downstream interface.

**Threshold** for the TTL of the multicast to avoid looping. Default value is 1.

You can add multiple **Networks**, each with an IP Address and Netmask.

Downstream
******************

You can add multiple **Downstreams**, each with an Interface and Threshold.

After saving a *Downstream Interface* you can optionally set Networks to specify who is allowed to communicate via the IGMP proxy.

It's not possible to use the Upstream interface as Downstream interface.