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Re: Common operational misconceptions
From: Masataka Ohta <mohta () necom830 hpcl titech ac jp>
Date: Tue, 21 Feb 2012 13:01:59 +0900

Steven Bellovin wrote:

I'm not sure what, do you think, is the problem, because the
paragraph of RFC2923 you quote has nothing to do with TCP
MSS.

Sure it does.  That's in 2.1; the start of it discusses PMTUD
failing for various reasons including firewalls.

Firewalls?

Though I have never assumed existence of firewalls, if you are
saying IPv6 will be even less operational because of firewalls,
I have no counter argument.

The text I quoted says, in so many words, "send smaller packets".
I don't know how it's possible to be more explicit than that.

No disagreement.

I have been keep saying that IPv6 can't depend on PMTUD and
must send packets of 1280B or less.

It's George Bonser, not me, who said there were other ways.

Please cite in context.  The text I quoted says that one option
is to try turning off DF; the next paragraph notes that you can't
do that on v6.

I thought the context is whether IPv6 is operational or not.

Or, is it whether PMTUDv4 operational or not?

Or, is your problem completely different from the above two?

Your clarification is helpful

                                        Masataka Ohta




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