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.
--
Fernando Gont
SI6 Networks
e-mail: fgont@xxxxxxxxxxxxxxx
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