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Enabling Multicast Routing

Strange.. I'd have thought 18.0.1 kernel was built with it enabled, it is by default in the sources.

In which case, you may need to use a userland utility. If it's IGMP/IPTV etc. give IGMP Proxy a shot. It it's mDNS (Avahi, Bonjour, Zeroconf), use mDNSd and enable reflection.

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