pub fn set_ipv6_multicast_hops<Fd: AsFd>( fd: Fd, multicast_hops: u32) -> Result<()>
setsockopt(fd, IPPROTO_IP, IPV6_MULTICAST_HOPS, multicast_hops)
setsockopt
netinet/in.h
ipv6
IPPROTO_IPV6