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Jonathan Nobels 273a9b4a4b health, ipn/ipnlocal, tsconst: warn when the selected or forced exit node is unusable

updates tailscale/corp#33007

When a selected exit node can't carry internet traffic, blackhole default
routes are installed and all internet traffic is dropped. That is the
correct behavior -- better to drop than leak to the local network, as
documented on ipn.Prefs.ExitNodeID -- but it was entirely silent: the
stable-ID lookup in nodeBackend.updateRouteManagerPrefs misses without a
log line, and Status leaves ExitNodeStatus nil. The user sees a healthy
Tailscale with no internet.

Add an exit-node-unavailable health warning covering every way the
selection can fail to carry traffic, reported via health.ArgExitNodeReason.

The warning names the exit node, caching its display name while it is
still a peer so the name survives its departure, and falls back to the
stable ID or IP. When the selection is mandated by the ExitNodeID or
ExitNodeIP policy settings, the message tells the user to contact their
network administrator instead of suggesting they pick another exit node.

Signed-off-by: Jonathan Nobels <jonathan@tailscale.com>

2026-08-28 11:10:52 -04:00

healthmsg

cmd/tailscale,ipn,net/netutil: remove rp_filter strict mode warnings (#18863 )

2026-03-04 14:09:19 -05:00

args.go

health, ipn/ipnlocal, tsconst: warn when the selected or forced exit node is unusable

2026-08-28 11:10:52 -04:00

health_test.go

all: don't repeat the the word "the" unnecessarily

2026-06-18 16:32:08 +01:00

health.go

tailcfg: replace int with DERPRegionID for additional type safety (#20646 )