EH isn't a HBH option or extension.
Joe
On 2020-02-27 15:06, Fernando Gont wrote:
> On 27/2/20 19:52, Joe Touch wrote:
>
>> FWIW - there are separable issues here:
>>
>> - whether an IP header (or parts thereof) should be changed in transit
>>
>> AFAICT, the answer has always been yes, but limited to the hopcount/ttl in
>> the base header and hop-by-hop options in the options/extension headers.
>>
>> - whether an IP header length can change in transit
>>
>> I see no reason why it can't become smaller, but if it can become larger
>> then PMTUD and PLPMTUD don't work.
>
> Besides AH (which obviously breaks), hosts typically try to validate that the
> error messages they receive correspond to something they actually sent.
>
> EH removal breaks that.
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