On DMVPN spokes migrating to IPv6 while still carrying IPv4, which tunnel mode enables both IPv4 and IPv6 DMVPN over the spoke?
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Correct answer: tunnel mode ipv6ip auto-tunnel.
Why this is the answer
The tunnel mode ipv6ip auto-tunnel command enables a spoke to encapsulate both IPv4 and IPv6 traffic within a GRE tunnel, allowing for a dual-stack DMVPN deployment. This is crucial during migration, as it supports both protocols simultaneously. tunnel mode ipv6ip 6to4 and tunnel mode ipv6ip 6rd are specific IPv6 transition mechanisms designed for tunneling IPv6 over IPv4, but they don't inherently support dual-stack DMVPN for both IPv4 and IPv6 traffic over the same tunnel in the way auto-tunnel does for DMVPN. tunnel mode ipv6ip isatap is another IPv6 transition mechanism, primarily for connecting isolated IPv6 hosts or networks over an IPv4 infrastructure, and is not the standard or most flexible choice for a dual-stack DMVPN spoke.
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