atm all igmp membership reports are forwarded to the upstream interface. Unfortunately some ISP Providers restrict some multicast groups (esp. those that are defined as local link groups and that are not supposed to be forwarded to the wan, i.e 220.127.116.11/24). Therefore there should be some kind of black oder whitelisting.
As whitelisting can be accomplished quite easy I wrote a litte patch, which is attached to this request.
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