DiG "unexpected source" with a Subnet-Router anycast address

[Kevin Darcy]

Why are you trying to use the SRAA for DNS resolution? SRAA has a 
special meaning to network-infrastructure devices; I don't think it was 
ever intended for anycasting general network services. Just pick one of 
your global-unicast address, and anycast that instead.

There was an old Internet-Draft specifying common *site-local* addresses 
for DNS resolvers, but that draft expired many years ago, and since 
site-local itself has been deprecated, could be considered doubly 
obsolete. (Although I still see those fec0:* addresses appended to the 
resolver list on a Windows XP PC with IPv6 enabled).

Note that RFC 4291 obsoletes RFC 3513 which obsoletes RFC 2373.


                                                                         
                                         - Kevin


On 9/7/2011 10:48 AM, François-Xavier Le Bail wrote:
> Hello,
>
> I send with DiG 9.7.3 a request to a router/DNS forwarder with the Subnet-Router anycast address of the router (SRAA, RFC 2373, § 2.6.1).
>
> The answer is :
> reply from unexpected source:<GUA of the router>#53, expected<SRAA>#53
>
> Is there an option to relax the IPv6 address request/reply control for this use case ?
>
> Best regards,
> François-Xavier Le Bail
>
> -----Message d'origine-----
> De : LE BAIL Francois-Xavier RD-RESA-LAN
> Envoyé : mercredi 7 septembre 2011 16:29
> À : LE BAIL Francois-Xavier RD-RESA-LAN
> Objet : DiG&  subnet-anycast router address
>
> DiG 9.7.3
>
> ;; reply from unexpected source: 2001:1:1:100:209:a9ff:fe13:1500#53, expected 2001:1:1:100::#53
>
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