IPv6 Exits succeed on Travis Linux, but Travis Linux doesn't support IPv6
So maybe we're not actually testing IPv6 traffic?
Here are the symptoms of this bug:
- Travis Linux VMs don't have IPv6
- Travis macOS VMs have IPv6
- Most IPv6 tests succeed on Travis macOS, but fail on Travis Linux
- The IPv6 exit test succeeds on Travis Linux, but it should not
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