> On Oct 2, 2015, at 2:18 PM, William Herrin <b...@herrin.us> wrote:
> 
> On Fri, Oct 2, 2015 at 5:03 PM, Fred Baker (fred) <f...@cisco.com> wrote:
>> There's no way to change the IPv4 address to be larger
> 
> http://bill.herrin.us/network/ipxl.html
> 
> There's always a way.
> 
> Regards,
> Bill Herrin

We could discuss IPv8 and IPv16...

The question I would ask about your model is how one determines whether one is 
looking at a 32 or 64 bit destination address. Does one, for example, have to 
parse the options field before making that determination? How does that work in 
a router that drops an IPv4 header that is not 20 bytes in length?

There were a number of options kicked around that, in one way or another, 
reused packet fields (what is we assume that fragmentation doesn't ever 
happen?) or inserted options. Right, wrong, or indifferent, it wasn't that it 
wasn't considered, it was that it wasn't chosen.

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