[Dnsmasq-discuss] Prefix delegation with DNSmasq
Simon Kelley
simon at thekelleys.org.uk
Sun Apr 12 18:01:40 BST 2020
The first question is, how static are your global addresses? Making a
network which can survive renumbering is a lot more difficult than one
with known and fixed addresses.
Simon.
On 12/04/2020 17:20, Oliver Freyermuth wrote:
> Dear DNSmasqers,
>
> I have a setup in mind and wonder whether dnsmasq is the correct tool (since I have not found the necessary functionality in the documentation yet).
>
> We have a /56 IPv6 network, and plan to use pure DHCPv6 (no stateless autoconfiguration) in several /64 networks.
> There are several subnets (currently NATed IPv4), such as — for example — a WireGuard VPN network, or a local isolated subnet.
> While with IPv4, the answer was the use of private addresses and NAT every time, potentially using a DHCP fowarder, for IPv6, the answer should be to use Global Unicast addresses everywhere (right?).
> How do I approach this correctly?
>
> Three options come to mind to handle such subnets:
> - Use ULAs and NAT (but that does not feel like IPv6...).
> - Delegate a prefix from the large network (where we'd use dnsmasq) to the "gateway" machine, which then would be a router.
> However, I am not aware if dnsmasq can delegate prefixes?
> - Use ProxyNDP (via npdpd or Linux kernel functionality). But I'm not sure if that scales well to a larger number of machines?
> - Use static routes on the central machine which send the /64 subnet to the "gateways" and use dnsmasq on the gateways.
> Am I missing something here, or should that "just work"?
>
> Is anybody aware of a best-practice guide here (please RTFM me)? Is dnsmasq the correct tool?
>
> Cheers and thanks for any guidance,
> Oliver
>
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