Multicast: Difference between revisions

It may happen that the computer hosting PPPoE is in an inconvenient location for watching and that other networked devices should receive copies of the stream. [http://troglobit.github.io/smcroute smcroute] lets one forward multicast statically at first and can even work where programs do not understand IGMP or in some situations even multicast, which can be aided with DNAT rules and/or use of -j REDIRECT on targets

FurtherIt workmay isbe possible later to have other programs listen for for IGMP internally/MLD and then "manage" smcroute, due to a possible linux limitation of only allowing one userspace program manage kernel mrouting at a time, to have maximum flexibility in upstreams and downstreams including internal sources.

For testing and usage, smcroute can reflect the multicast to other attached networks. The oldsmcroute SMCroute2.4.4 as found in Debian 11, would not configure the interface without an IP address on it, however the very latest smcroute allows 0.0.0.0 to be used to originate the IGMP3 joins, this needed the upgrade from ip_mreq to ip_mreqn in the smcroute code.

smcroute requires the source address, this was found with wireshark or tcpdump, and could be subject to change, <var>int0</var> and <var>ext0</var> are example devices to copy multicast packets to, these could be internal vlans on a home network: