RIPng
RIPng, defined in RFC 2080, is an extension of RIP2 designed to support IPv6. However, RIPng varies from RIPv2 in that it is not fully backwards compatible with RIPv1.
• RIPng does not support RIPv1 update authentication, it relies on IPsec
• RIPng does not allow attaching tags to routes as in RIPv2
• RIPng requires specific encoding of the next hop for a set of route entries, unlike RIPv2 that encodes the next-hop into each route entry.