In a discussion titled "Stable privacy addresses (upcoming rev)", Fernando Gont said: > They could [...] have RAs require you to do DHCPv6 and then have > DHCPv6 assign you a constant address, etc.
What interests me here is the phrase "have RAs require you to do DHCPv6".
When, if ever, are hosts "required" to obtain an address via DHCPv6?
When the "M" flag is set in an RA?
There was a bunch of stuff about the M and O flags in RFC2462, almost
all of which was removed in RFC4862. In RFC2462, the word
"should" (*not* capitalised) was used, along with phrases like "is to
be".
Then there is RFC 4861 (neighbor discovery) which says:
M 1-bit "Managed address configuration" flag. When
set, it indicates that addresses are available via
Dynamic Host Configuration Protocol [DHCPv6].
[...]
O 1-bit "Other configuration" flag. When set, it
indicates that other configuration information is
available via DHCPv6.
Anyway, I've been working on the basis that the M and O flags are
advisory and not prescriptive. That is, they do not *require* the host
to do anything.
Regards, K.
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Karl Auer (ka...@biplane.com.au)
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