On Sat, 14 May 2022, Ludovic Courtès wrote:

Hi,

Thinking about it, what do you think is the risk of using AF_INET6
unconditionally?

AFAICS it just works.  Is there a switch somewhere that might affect
that behavior?

Yes, I beleive that it's in sysctl:

```
$ sysctl net.ipv6.bindv6only
net.ipv6.bindv6only = 0
```

If enabled, the v6 socket wouldn't work for v4. Disabled is the default on Guix System. I don't know what would happen if v6 were disabled entirely. Hopefully that's not something we have to worry about in 2022.

HTH,
Jack

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