Limit of 6over4
6over4 relies on IPv4 multicast availability which is not very widely supported by IPv4 networking infrastructure. 6over4 is of limited practical use, and is not supported by the most common operating systems. To connect IPv6 hosts on different physical links, IPv4 multicast routing must be enabled on the routers connecting the links.
ISATAP is a more complex alternative to 6over4 which does not rely on IPv4 multicast.
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