Brad Fitzpatrick 9df2516f96 wgengine/router: ignore Linux ip route error adding dup route
Updates #3060
Updates #391

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
(cherry picked from commit 14f9c7529338c046706d16fa560ea356d98bbcb7)
2021-10-14 19:23:52 -04:00
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