igmpproxy
                                
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                        Code [seems to support] multiple upstream interfaces. Documentation claims it does not.
As of this commit in 2013, the igmpproxy code seems to support multiple upstream interfaces. The code changes to support this were pretty substantial, but the documentation was never changed.
Patches for updating documentation are welcome.
Great. I will check to see what does and does not work before writing anything.
Did you manage to find out if it works and/or is stable enough?