IPv6 UDP support

[stayallive]

Hey all!

From my searching it seems a tradition to ask each new year how IPv6 UDP support is coming along!

Incoming! UDP Support Arriving Soon

Ahhh! We are more behind on this than I thought. I’ll put an update here next week sometime.

IPv6 UDP?

Serious question: is there an app you’d ship in April if we had v6 UDP Anycast that you can’t ship today? (We’re definitely doing v6 UDP Anycast! The issue is where to prioritize it. It’s not a hard feature to write, but it is a super irritating and SRE-intensive feature to roll out.)

I am exploring ways to host a DNS service and having IPv6 is (these days) pretty wanted for that kind of thing.

I can see and read that basically the only use case for this is DNS (mostly) and it’s probably not high on the list for Fly, but after a few years of on-and-off news I hoped it would be along by now

Hope we can get another update on how the priorities are on this!

[ZoOmZoOm]

+1

Another use case is QUIC related apps.

[ignoramous]

@ZoOmZoOm

Another use case is QUIC related apps.

QUIC won’t be easy. You’d need a QUIC-aware load balancer / reverse proxy as the protocol supports connection migrations across servers and client IPs.

[davewasmer]

Also curious about this.

I’m hoping to establish stateful WebRTC connections with individual Machines, and I’ve hit a bit of a roadblock. Without UDP over IPv6, I’d have to allocate a dedicated IPv4 address per Machine (i.e. possibly spin up a new app per each Machine), which rapidly becomes expensive at $2/mo for each IP.

Or perhaps there’s a better way to accomplish this?

[andrewtj]

I’m also looking at Fly.io’s suitability for hosting a DNS service. In my case IPv4 is more of an impediment than a benefit and ideally I’d have a unique IPv6 address per user. Hopefully this is something Fly.io can fulfil at some point in the near future.