> there was a question regarding to DNS response against this kind of
> query:
> (src=x dst=anycast)
> needs to have anycast source address or not.
I would be setting the anycast address as the source address of the
reply.
>
> from RFC2181, it is legal to use non-anycast address for response.
This part was written for broadcast and multicast addresses.
>
> and for the resolver side (implementation issue):
> - BIND8 resolver checks source address match by default, but can easily
> turned off by RES_INSECURE2 flag bit on res.options.
> - MS windows DNS resolver does not (correct me if I'm wrong about this)
> .
>
> itojun
>
>
> ---
> 4.1. UDP Source Address Selection
>
> To avoid these problems, servers when responding to queries using UDP
> must cause the reply to be sent with the source address field in the
> IP header set to the address that was in the destination address
> field of the IP header of the packet containing the query causing the
> response. If this would cause the response to be sent from an IP <-
> address that is not permitted for this purpose, then the response may <-
> be sent from any legal IP address allocated to the server. That <-
> address should be chosen to maximise the possibility that the client
> will be able to use it for further queries. Servers configured in
> such a way that not all their addresses are equally reachable from
> all potential clients need take particular care when responding to
> queries sent to anycast, multicast, or similar, addresses.
>
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--
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