IGMP proxy

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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 igmp-proxy.

# show protocols igmp-proxy 
 interface eth0 {
     alt-subnet 10.0.0.0/23
     role upstream
 }
 interface eth1 {
     role downstream
 }