I am trying to establish an IPV6 GRE tunnel and the only way I can get
it to work is if I have a valid IPv6 source and destination. Is it not
possible to tunnel GRE ipv6 over IPv4? I realize you can do an ipv6ip
and make this work.

I guess I am a bit confused, what are the differences between

tunnel mode gre
tunnel mode ipv6
tunnel mode ipv6ip


Thank you,

Marc
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