Hi Ron,
> -----Original Message-----
> From: ipv6-boun...@ietf.org [mailto:ipv6-boun...@ietf.org] On Behalf Of
> Ronald Bonica
> Sent: Tuesday, July 09, 2013 5:33 PM
> To: Doug Barton
> Cc: ipv6@ietf.org
> Subject: RE: Meta-issues: On the deprecation of the fragmentation
> function
>
> Doug,
>
> Let's see if we can find some common ground.
>
> Assume that the IETF is considering a new protocol that doesn't run
> over TCP. In order to deal with MTU issues, the new protocol must do
> one of the following:
>
> a) implement PLMTUD or PMTUD
> b) restrict itself to sending PDUs so small that when they are
> encapsulated in an IPv6 header, the resulting packet will not exceed
> 1280 bytes
> c) rely on IPv6 fragmentation
>
> Is there ever a reason why c) is better than a) or b). For that matter,
> is c) ever an acceptable solution?
Fragmentation at a tunnel ingress router is unavoidable. Proof:
- a tunnel configures a 1280 MTU
- When its packets are encapsulated they emerge as (1280 + HLEN)
(the length of the encapsulating headers)
- the tunnel crosses a 1280 link somewhere in the path to the egress
- the packet is dropped with a PTB signal sent back
- the ingress now has two choices: 1) start fragmenting, 2) quit.
Thanks - Fred
fred.l.temp...@boeing.com
> Ron
>
> > -----Original Message-----
> > From: Doug Barton [mailto:do...@dougbarton.us]
> > Sent: Tuesday, July 09, 2013 2:41 PM
> > To: Ronald Bonica
> > Cc: ipv6@ietf.org
> > Subject: Re: Meta-issues: On the deprecation of the fragmentation
> > function
> >
> > On 07/09/2013 11:12 AM, Ronald Bonica wrote:
> > > Doug,
> > >
> > > It might be interesting to revisit what we mean by deprecating IPv6
> > fragmentation....
> > >
> > > It means that the IETF will not approve any new protocols that rely
> > upon IPv6 fragmentation. Nothing more, nothing less.
> >
> > Thanks for clarifying. FWIW, I understand what is being proposed, and
> I
> > still think it's a bad idea.
> >
> > Doug
> >
> >
>
>
>
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