> The field sin6_scope_id should be used only for link-local addresses (to > define their scope), not as a way to route multicasts. > > (Hmm, ff02::/16 is defined as link-local multicast address, so perhaps > setting sin6_scope_id makes sense.)
FWIW, babeld uses the sin6_scope_id when sending its multicast packets (it does not do the setsockopt), and we've never received a report about packets going out the wrong interface. -- Juliusz
