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Re: [v6ops] Windows 10 doesn't honour 'M' flag in RA

Bob Hinden <bob.hinden@gmail.com> Wed, 13 December 2017 16:45 UTC

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From: Bob Hinden <bob.hinden@gmail.com>
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Date: Wed, 13 Dec 2017 08:45:46 -0800
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Cc: Bob Hinden <bob.hinden@gmail.com>, Tim Chown <Tim.Chown@jisc.ac.uk>, "v6ops@ietf.org" <v6ops@ietf.org>, IPv6 List <ipv6@ietf.org>
To: Ted Lemon <mellon@fugue.com>
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Subject: Re: [v6ops] Windows 10 doesn't honour 'M' flag in RA
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Ted,

The actual text from Section 4.2. "Router Advertisement Message Format” in RFC4861 is:

      M              1-bit "Managed address configuration" flag.  When
                     set, it indicates that addresses are available via
                     Dynamic Host Configuration Protocol [DHCPv6].

                     If the M flag is set, the O flag is redundant and
                     can be ignored because DHCPv6 will return all
                     available configuration information.

      O              1-bit "Other configuration" flag.  When set, it
                     indicates that other configuration information is
                     available via DHCPv6.  Examples of such information
                     are DNS-related information or information on other
                     servers within the network.

        Note: If neither M nor O flags are set, this indicates that no
        information is available via DHCPv6.

I think the protocol specification is clear.

Bob




> On Dec 13, 2017, at 8:03 AM, Ted Lemon <mellon@fugue.com> wrote:
> 
> On Dec 13, 2017, at 7:29 AM, Tim Chown <Tim.Chown@jisc.ac.uk> wrote:
>> A ‘hint’ was the consensus.
> 
> A 'hint' was the vote.   I don't believe that it was a consensus.   As Naveen points out, the current solution is technically invalid.   It would be better not to have the 'M' bit than to have it be a hint.
> 
> 
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