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doc: add help on fixing IPv6 test failures #24372

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10 changes: 10 additions & 0 deletions BUILDING.md
Original file line number Diff line number Diff line change
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. However, if your main interface has IPv6 addresses then your
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loopback interface must also have '::1' enabled. For some default installations
on Ubuntu that does not seem to be the case. '::1' can be enabled on the
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on Ubuntu that does not seem to be the case. '::1' can be enabled on the
on Ubuntu, that does not seem to be the case. '::1' can be enabled on the

loopback interface on Ubuntu using:
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Replace the last sentence with this?

To enable '::1' on the loopback interface on Ubuntu:

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Or at least

You can enable...

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I'm sure I had something like "You can .." but guidance is not to use you. :)


```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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