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| | RFC 3056 |
 | | IPv6 packets are transmitted in IPv4 packets [RFC 791] with an IPv4 protocol type of 41, the same as has been assigned [MECH] for IPv6 packets that are tunneled inside of IPv4 frames. |
 | | Specifically, this means that IPv4 addresses defined in [RFC 1918], broadcast, subnet broadcast, multicast and loopback addresses are unacceptable. |
 | | [RFC 1918] Rekhter, Y., Moskowitz, R., Karrenberg, D., de Groot, G. and E. Lear, "Address Allocation for Private Internets", BCP 5, RFC 1918, February 1996. |
| www.apps.ietf.org /rfc/rfc3056.html (5846 words) |
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