Re: Fwd: Confirmation to advance: draft-ietf-6man-ipv6only-flag-05

[David Farmer <[e-mail]>]

On Thu, May 9, 2019 at 8:32 AM Alexandre Petrescu <
[e-mail]> wrote:

> Le 08/05/2019 à 00:23, David Farmer a écrit :
>
> > 1. Layer 2 filtering of Etherthypes 0x0800 and 0x0806
>
> Layer-2 filtering on ethertype is a great idea.  I would concur.
>
> But on cellular links there's no ethertype.  It's what they call a PDP
> type.
>
> (this is not a support neither not support of  the draft; my own idea of
> the draft is that because is covered by IPR it is basically killed).
>

Is I've said we want the flag to be compatible with Layer 2 filtering of
Etherthypes 0x0800 and 0x0806, but it is not a substitute for the flag.
This filtering will block the dual-stack host's IPv4 DHCPDISCOVERS and
therefore it will receive any DHCPOFFERS. However, without the flag, the
dual-stack host will auto-configure an IPv4 Link-Local address and attempt
to send IPv4 service discovery and continue to send DHCPDISCOVERS, all of
which are futile and waste energy and processing on the host.

In a cell network, this flag probably isn't necessary, but I don't see how
setting the flag would make things any worse for a cell network and it is
possible that badly implemented cell clients might stop sending futile IPv4
DHCPDISCOVERS and IPv4 service discovery traffic because they implemented
and received this flag.

thanks

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