>At a minimum, implementations should be able to convert the=20
>ICMP errors happening from within the IPv4 tunnel back to
>ICMPV6 error and send it back to the original sender (IPv6 sender
>in case of IPv6 over IPv4 tunnels). Otherwise path mtu
>discovery will never work assuming you set the DF bit in
>the IPv4 header. if you do this, storing the state
>is not really complex I guess.
if you don't set DF bit on IPv4 packet (after encapsulation),
it is not mandatory to convert ICMPv4 to ICMPv6 (actually, you won't
see ICMPv4 need fragment). simpler the better.
itojun
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