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tailscale/net/dnscache
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Brad Fitzpatrick 8d6cf14456 net/dnscache: don't do bootstrap DNS lookup after most failed dials 
If we've already connected to a certain name's IP in the past, don't
assume the problem was DNS related. That just puts unnecessarily load
on our bootstrap DNS servers during regular restarts of Tailscale
infrastructure components.

Also, if we do do a bootstrap DNS lookup and it gives the same IP(s)
that we already tried, don't try them again.

Change-Id: I743e8991a7f957381b8e4c1508b8e9d0df1782fe
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2022-02-14 14:28:08 -08:00
..
dnscache_test.go net/dnscache: don't do bootstrap DNS lookup after most failed dials 2022-02-14 14:28:08 -08:00
dnscache.go net/dnscache: don't do bootstrap DNS lookup after most failed dials 2022-02-14 14:28:08 -08:00
messagecache_test.go net/dnscache, net/tsdial: add DNS caching to tsdial UserDial 2021-12-09 11:34:21 -08:00
messagecache.go net/dnscache, net/tsdial: add DNS caching to tsdial UserDial 2021-12-09 11:34:21 -08:00