IPv6 day and tunnels

Tue Jun 5 00:57:06 UTC 2012

On Jun 4, 2012, at 5:33 PM, Masataka Ohta wrote:

> Joe Maimon wrote:
> 
>> pMTU has been broken in IPv4 since the early days.
> 
>> It is still broken. It is also broken in IPv6. It will likely
>> still be broken for the forseeable future. This is
> 
>> Relying on ICMP exception messages was always wrong for normal network operation.
> 
> Agreed.
> 
> The proper solution is to have a field in IPv7 header to
> measure PMTU. It can be a 8 bit field, if fragment granularity
> is 256B.
> 
> 						Masataka Ohta

If you're going to redesign the header, I'd be much more interested in having 32 bits for the destination ASN so that IDR can ignore IP prefixes altogether.

Owen