Correct: IPv6 RA Guard operates at Layer 2 and is designed to filter out rogue Router Advertisement (RA) messages from unauthorized sources. However, it is unable to inspect or filter RA messages that are encapsulated within tunnels (e.g., IPv6-in-IPv4 tunnels), since these messages would bypass the Layer 2 filtering mechanism.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6_fhsec/configuration/xe-16/ip6f-xe-16-book/ip6-ra-guard.html
says
//The IPv6 RA Guard feature does not offer protection in environments where IPv6 traffic is tunneled.//
It does not offer protection in environments where IPv6 traffic is tunnelled.
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