Re: [v6ops] Operational Consensus on deployment

[Vízdal Aleš <[e-mail]>]

> -----Original Message-----
> From: v6ops [mailto:[e-mail]] On Behalf Of
> Philip Homburg
> Sent: Wednesday, August 06, 2014 4:44 PM
> To: Gert Doering
> Cc: IPv6 Ops WG; Tore Anderson
> Subject: Re: [v6ops] Operational Consensus on deployment
>
> In your letter dated Wed, 6 Aug 2014 14:32:43 +0200 you
> wrote:
> >Why do you find it so hard to accept that "dual-stack
> inside" is not a
> >desirable property?
>
> I find that very easy to accept. Except that from my point of
> view the proposals presented to avoid dual stack are worse.
>
> The way I see it, translating IPv4 into IPv6 is just going to
> bite you.
>
> Now, tunneling IPv4 over IPv6 may work, if the tunneling is
> local and if the tunnel preserves a 1500 octet MTU for IPv4.

I guess you're talking about a softwire, so let me cite RFC5565:

   Transmitting a packet through a softwire always requires that an
   encapsulation header be added to the original packet.  The resulting
   packet is therefore always longer than the encapsulation payload.  As
   an operational matter, the Maximum Transmission Unit (MTU) of the
   softwire's path SHOULD be large enough so that (a) no packet will
   need to be fragmented before being encapsulated, and (b) no
   encapsulated packet will need to be fragmented while it is being
   forwarded along a softwire.  A general discussion of MTU issues in
   the context of tunneled forwarding may be found in [RFC4459].

> At the end of the day, all externally visible stuff still has
> to have IPv4.
> That is dual stack, no matter how you slice it.

I think that Tore's work is showing that there are alternatives to dual-stack.

Ales

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