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tailscale/net
Kevin Allen c0c182f487 Add flag to disable bootstrap dns
Adds an optional (default off) boolean environment flag
`TS_NO_DNS_FALLBACK` which will simply disable functionality to fallback
to using Tailscale DNS servers as indicated in text logs like:

```
trying bootstrapDNS("derp8c.tailscale.com", "2a03:b0c0:1:d0::e1f:4001")
for "log.tailscale.io" ...
```

For some user environments, it is desirable to strictly control outbound
access to external servers and and leaked data or metadata - and losing
this functionality is a desired trade off.

Closes #7981

Signed-off-by: Kevin Allen <kallen@bostondynamics.com>
2 years ago
..
art net/art: skip tests on CI for now 2 years ago
connstats net/connstats: exclude traffic with internal Tailscale service (#7904) 2 years ago
dns all: avoid repeated default interface lookups 2 years ago
dnscache Add flag to disable bootstrap dns 2 years ago
dnsfallback all: avoid repeated default interface lookups 2 years ago
flowtrack all: update copyright and license headers 2 years ago
interfaces all: move network monitoring from wgengine/monitor to net/netmon 2 years ago
memnet net/memnet: rename from net/nettest 2 years ago
netaddr all: update copyright and license headers 2 years ago
netcheck net/ping,netcheck: add v6 pinging capabilities to pinger (#7971) 2 years ago
neterror net/neterror, wgengine/magicsock: use UDP GSO and GRO on Linux (#7791) 2 years ago
netknob all: update copyright and license headers 2 years ago
netmon all: move network monitoring from wgengine/monitor to net/netmon 2 years ago
netns all: avoid repeated default interface lookups 2 years ago
netstat net/{netns,netstat}: use new x/sys/cpu.IsBigEndian 2 years ago
netutil all: replace /kb/ links with /s/ equivalents 2 years ago
packet net/packet: add NAT support for DCCP and GRE 2 years ago
ping net/ping,netcheck: add v6 pinging capabilities to pinger (#7971) 2 years ago
portmapper all: avoid repeated default interface lookups 2 years ago
proxymux all: update copyright and license headers 2 years ago
routetable net/routetable: include unknown flags in the routetable doctor output 2 years ago
socks5 net/socks5: add password auth support 2 years ago
sockstats all: avoid repeated default interface lookups 2 years ago
speedtest all: update copyright and license headers 2 years ago
stun wgengine/magicsock, types/nettype, etc: finish ReadFromUDPAddrPort netip migration 2 years ago
tlsdial health, net/tlsdial: add healthcheck for self-signed cert 2 years ago
tsaddr all: replace /kb/ links with /s/ equivalents 2 years ago
tsdial all: avoid repeated default interface lookups 2 years ago
tshttpproxy net/tshttpproxy: don't proxy through ourselves 2 years ago
tstun net/tstun: add tests for captureHook 2 years ago
wsconn all: update copyright and license headers 2 years ago