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In the past, one could use an IPv6 server through sixxs.net gateway. Now the service is gone.

However, I found there is a free Cloudflare gateway. I assume the IPv6 server is to be associated to a domain or subdomain through an AAAA record. I don't think this is possible otherwise.

However, Cloudflare docs are full of marketing hype and I don't actually understand if an IPv4-only client will be able to access IPv6-only servers through them (for ssh or for hosting a webserver).

Can you give me an answer, please?

antonio
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  • Cloudflare provides a free service level. Any reason why you haven't just tried it? – Sander Steffann Sep 19 '17 at 23:14
  • Exactly what protocol are you trying to use? Your question is tagged DNS but asks about SSH and HTTP. I doubt you can do SSH with the free service because in order to work with a non-modified SSH client it requires a separate IPv4 address per backend. – kasperd Sep 20 '17 at 12:55
  • @SanderSteffann: You are not totally wrong) However, before making the tests (so getting the IPv6, setting up the server, registering it with Cloudflare), I wanted to probe if someone had some previous knowledge/experience, considering how common Cloudfare is. What for setup everything if I know in advance it would not work as (I understand is) advertised? – antonio Sep 20 '17 at 20:54
  • @kasperd: SSH and HTTP are the desired services. I mentioned DNS, because I had in mind a managed DNS provider routing requests from an IPv4 client to an IPv6 server. If the gateway service does not provide a DNS too, how can it be reached by an IPv4-only client? – antonio Sep 20 '17 at 20:56
  • @antonio DNS is difficult to get right even when no proxy is involved. Proxying DNS traffic is complicated, and I don't know if anybody tried to do it. It's something I have wanted to implement myself, but I haven't had the time. But do you really need DNS traffic to be proxied? Is there any reason you can't have your domain hosted on authoritative servers with dual stack connectivity? – kasperd Sep 21 '17 at 19:50
  • @kasperd: There are now some VPS offers that give an IPv4 address and a bunch of IPv6 addresses. I'd like to use the main IPv4 for the primary services and one or more IPv6's for secondary services (backup/recovery/testing). To make IPv6's worth using (and buy) they should be reachable from an IPv4 client too. A DNS provider which could route IPv4 requests to IPv6 seems one way to obtain this. If DNS+gateway service cost < new IPv4, buying a bunch of IPv6 makes sense. – antonio Sep 22 '17 at 09:24
  • @antonio Why not just run a single authoritative DNS server which listens on all addresses assigned to the host? The zones will be in different zone files and a DNS server has no problem serving many zones from different files. – kasperd Sep 22 '17 at 09:29
  • @Well, mainly for performance reasons, a provider (like Cloudflare) gives features in terms of load-balancing and optimisation not attainable by adding an authoritative DNS as the n-th service to a VPS. Plus, they give some peace of mind in terms of DDoS protection. – antonio Sep 23 '17 at 21:35

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Yes, cloudflare support IPv6 addresses to your origin server, and will accept both IPv4 and IPv6 from clients.

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I am currently using a Vultr server which is $2.5 per month, and only support IPv6

Kind Contributor
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  • Does that support any other protocols than HTTP? Can it do SSH, DNS, and SMTP? (The question mentions SSH and HTTP and is tagged DNS) – kasperd Jul 30 '18 at 06:05
  • I think it's only for HTTP on ports 80/443. The question says "SSH or HTTP" - this works for HTTP. If they meant "SSH AND HTTP", then the question should be updated. I use VULTR Console to access the console (not SSH). I also use Putty on another cloud machine which has both IPv4 and IPv6 to connect via SSH. – Kind Contributor Aug 02 '18 at 03:46