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---
lastproofread: '2023-11-13'
---
(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 the
upstream.
If it's vital that the daemon should act exactly like 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.
```
(igmp-proxy-example)=
### 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.
```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.
```
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