> On Sep 12, 2019, at 6:57 AM, Templin (US), Fred L <fred.l.temp...@boeing.com> 
> wrote:
> 
>>> IPv4 with a small PMTU also comes to mind, as discussed in Section 3.2.2 of 
>>> RFC 4213:
>>> 
>>>   In this case, the IPv6 layer has to "see" a link
>>>   layer with an MTU of 1280 bytes and the encapsulator has to use IPv4
>>>   fragmentation in order to forward the 1280 byte IPv6 packets.
>> 
>> Yes, IP fragmentation - exactly.
> 
> See also Section 7 of RFC2473.

There are a number of issues with that RFC, as noted in intarea-tunnels.

E.g., it won’t properly do what you say for IPv4 DF=0 (i.e., treat the tunnel 
as a true link layer by allowing frag at the tunnel header), nor will it 
correctly interconnect two hosts for packets with TTL/hopcounts fo 0 (which 
should work - only routers should decrement those).

Joe

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