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-.. _igmp_proxy:
-
-##########
-IGMP Proxy
-##########
-
-:abbr:`IGMP (Internet Group Management Protocol)` proxy sends IGMP host messages
-on behalf of a connected client. The configuration must define one, and only one
-upstream interface, and one or more downstream interfaces.
-
-Configuration
-=============
-
-.. cfgcmd:: set protocols igmp-proxy interface <interface> role <upstream | downstream>
-
- * **upstream:** The upstream network interface is the outgoing interface
- which is responsible for communicating to available multicast data sources.
- There can only be one upstream interface.
-
- * **downstream:** Downstream network interfaces are the distribution
- interfaces to the destination networks, where multicast clients can join
- groups and receive multicast data. One or more downstream interfaces must
- be configured.
-
-.. cfgcmd:: set protocols igmp-proxy interface <interface> alt-subnet <network>
-
- Defines alternate sources for multicasting and IGMP data. The network address
- must be on the following format 'a.b.c.d/n'. By default the router will
- accept data from sources on the same network as configured on an interface.
- If the multicast source lies on a remote network, one must define from where
- traffic should be accepted.
-
- This is especially useful for the upstream interface, since the source for
- multicast traffic is often from a remote location.
-
- This option can be supplied multiple times.
-
-.. cfgcmd:: set protocols igmp-proxy disable-quickleave
-
- Disables quickleave mode. In this mode the daemon will not send a Leave IGMP
- message upstream as soon as it receives a Leave message for any downstream
- interface. The daemon will not ask for Membership reports on the downstream
- interfaces, and if a report is received the group is not joined again
- upstream.
-
- If it's vital that the daemon should act exactly as a real multicast client
- on the upstream interface, this function should be enabled.
-
- Enabling this function increases the risk of bandwidth saturation.
-
-.. cfgcmd:: set protocols igmp-proxy disable
-
- Disable this service.
-
-Example
--------
-
-Interface `eth1` LAN is behind NAT. In order to subscribe `10.0.0.0/23` subnet
-multicast which is in `eth0` WAN we need to configure igmp-proxy.
-
-.. code-block:: none
-
- set protocols igmp-proxy interface eth0 role upstream
- set protocols igmp-proxy interface eth0 alt-subnet 10.0.0.0/23
- set protocols igmp-proxy interface eth1 role downstream
-
-Operation
-=========
-
-.. opcmd:: restart igmp-proxy
-
- Restart the IGMP proxy process.
-