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doc: add help on fixing IPv6 test failures #24372

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12 changes: 11 additions & 1 deletion BUILDING.md
Original file line number Diff line number Diff line change
Expand Up @@ -159,7 +159,7 @@ explains how to install all prerequisites.
* GNU Make 3.81 or newer

On macOS, install the `Xcode Command Line Tools` by running
`xcode-select --install`. Alternatively, if you already have the full Xcode
`xcode-select --install`. Alternatively, if you already have the full XcodeI
installed, you can find them under the menu `Xcode -> Open Developer Tool ->
More Developer Tools...`. This step will install `clang`, `clang++`, and
`make`.
Expand Down Expand Up @@ -253,6 +253,16 @@ $ ./node ./test/parallel/test-stream2-transform.js
Remember to recompile with `make -j4` in between test runs if you change code in
the `lib` or `src` directories.

The tests attempt to detect support for IPv6 and exclude IPv6 tests if
appropriate. If your main interface has IPv6 addresses, then your
loopback interface must also have '::1' enabled. For some default installations
on Ubuntu that does not seem to be the case. To enable '::1' on the
loopback interface on Ubuntu:

```bash
sudo sysctl -w net.ipv6.conf.lo.disable_ipv6=0
```

#### Running Coverage

It's good practice to ensure any code you add or change is covered by tests.
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