Win7 client, IPv6 network, multicast DNS equests and BIND name server?

[Mattia Rossi]

Am 28.03.2013 14:49, schrieb Lev Serebryakov:
> Hello, Freebsd-net.
>
>   This question is not very FreeBSD specific, but as my router and DNS
> server are FreeBSD-based, I think a could ask it here and don't
> subscribe do BIND-related list, Ok?
>
>   When DHCPv4 is not available, Win7 clients on my network pick up
> proper IPv6 prefix, but cannot pick up DNS server name from router
> advertisment. In such situation Win7 clients try to use ff01::
> multicast addresses for DNS resolution.
>
>   I have bind server, which listens on all addresses (udp6 *:53), but
> it seems, that it doesn't answer on these requests :(
>
>   Is it possible to configure BIND (system one) to process such
> requests?
>
In my experience you need to run a DHCPv6 server along with the rtadvd 
daemon to get the DNS server to your Win7 box.
In rtadvd.conf set the raflags to:
      :raflags="o":\

This tells the client to look for a DHCPv6 server, and to grab the 
information supplied there.
In your dhcpd.conf (ISC DHCPD) then you need an entry like this:

subnet6  2001:db8::/64 {
         option dhcp6.name-servers 2001:db8::1;
}

Where the subnet has to reflect the actual subnet configured on the 
interface you're sending out DHCP offers.

In rc.conf add:
     dhcpd6_enable="YES"
     dhcpd6_ifaces="em0" or whatever interface DHCP should listen on.

And now your Win7 should be happy.

Win7 using ff01: for DNS lookups seems a bit strange to me, as I thought 
that Win7 is using LLMNR 
(http://en.wikipedia.org/wiki/Link-local_Multicast_Name_Resolution), the 
counterpart to MDNS (http://en.wikipedia.org/wiki/Multicast_DNS) to look 
up names on the local Lan and to discover services 
(http://en.wikipedia.org/wiki/Zero_configuration_networking). Both use 
addresses from the ff02: range.

I've looked into getting MDNS to update BIND like DHCP would do for 
DDNS, but had no luck to get that going.
I don't think LLMNR could interoperate with BIND at all.

Hope that helps.

Cheers,

Mat