[Dnsmasq-discuss] about ipv6 prefix delegation

[Carlos Carvalho]

Eric Luehrsen (ericluehrsen at hotmail.com) wrote on Sun, Oct 18, 2015 at 03:35:22AM BRST:
> >>>> dhcp-option=option6:dns-server,[::]
> 
> 
> >>> This is correct but not necessary, dnsmasq does it by default.

> This CAN BE necessary, depending. This option has a valid use case with
> SLAAC+DHCPV6 (stateful or stateless) for DNSMASQ router advertisements. The
> default RA DNS FIELD uses the link-address fe80::/64
[removed]
> So the option above will instruct DNSMASQ to RA the DNS FIELD of its
> interface with respect to global-address or unique-local-address fd00::/8 the
> RA is for.

Yes. However when the dns server is transmitted via dhcp, stateful or
stateless, the non-link address is sent. This was the case to which I replied.
This difference is a subtlety that may cause confusion.