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net/dnscache, control/controlclient: use DNS cache when dialing control

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Cache DNS results of earlier login.tailscale.com control dials, and use
them for future dials if DNS is slow or broken.

Fixes various issues with trickier setups with the domain's DNS server
behind a subnet router.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2020-11-11 12:37:53 -08:00
committed by Brad Fitzpatrick
parent 97e82c6cc0
commit a2d78b4d3e
4 changed files with 111 additions and 8 deletions
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cmd/tailscaled/depaware.txt
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@@ -58,7 +58,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
tailscale.com/logtail/backoff from tailscale.com/control/controlclient+
tailscale.com/logtail/filch from tailscale.com/logpolicy
tailscale.com/metrics from tailscale.com/derp
tailscale.com/net/dnscache from tailscale.com/derp/derphttp+
tailscale.com/net/dnscache from tailscale.com/control/controlclient+
💣 tailscale.com/net/interfaces from tailscale.com/ipn+
tailscale.com/net/netcheck from tailscale.com/wgengine/magicsock
💣 tailscale.com/net/netns from tailscale.com/control/controlclient+