Can't install packages over NAT64

[elad]

Hello,

When I'm on an IPv4 network, everything is fine:

$ mix deps.get         
Running dependency resolution...
Dependency resolution completed:
  poison 3.1.0
* Getting poison (Hex package)
  Checking package (https://repo.hex.pm/tarballs/poison-3.1.0.tar)
  Fetched package
$

However, when I connect to an IPv6 VPN that does NAT64 for talking with the public internet, I can't install packages:

$ mix deps.get
Failed to fetch record for 'poison' from registry (using cache)
{:failed_connect, [{:to_address, {'repo.hex.pm', 443}}, {:inet, [:inet], :nxdomain}]}
Running dependency resolution...
Dependency resolution completed:
  poison 3.1.0
All dependencies up to date
$

Without inspecting the code, it seems to me that it explicitly looks for A records in the response, ignoring AAAA records (that are present in the response).

Is it intended to not work in such IPv6 scenarios?

[ericmj]

I haven't tested with ipv6 and don't know if it's supposed to work. This would likely be configured or a feature on a different level than hex. I would suggest looking into httpc and the dns lookup that ships with OTP.

[ericmj]

Closing due to no activity.

[genofire]

exactly same problem 😅

[mapoulin]

Same issue, over IPV6-only network it fails to download the dependencies. I see that Mix has had a similar issue and implemented this fix.

[ericmj]

We would accept a PR with the same fix for Hex.