Brad Fitzpatrick fc30cff688 wgengine/router: don't configure IPv6 on Linux when IPv6 is unavailable
Fixes #1214

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
(cherry picked from commit c7fc4a06dad9eaa5c42e525ddd69d50aede6c919)
2021-01-28 13:45:59 -08:00
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