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Anton Tolchanov 8cc5c51888 health: warn about reverse path filtering and exit nodes ... When reverse path filtering is in strict mode on Linux, using an exit node blocks all network connectivity. This change adds a warning about this to `tailscale status` and the logs. Example in `tailscale status`: ``` - not connected to home DERP region 22 - The following issues on your machine will likely make usage of exit nodes impossible: [interface "eth0" has strict reverse-path filtering enabled], please set rp_filter=2 instead of rp_filter=1; see https://github.com/tailscale/tailscale/issues/3310 ``` Example in the logs: ``` 2024/02/21 21:17:07 health("overall"): error: multiple errors: not in map poll The following issues on your machine will likely make usage of exit nodes impossible: [interface "eth0" has strict reverse-path filtering enabled], please set rp_filter=2 instead of rp_filter=1; see https://github.com/tailscale/tailscale/issues/3310 ``` Updates #3310 Signed-off-by: Anton Tolchanov <anton@tailscale.com>		3 months ago
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bugreport.go	all: update copyright and license headers	1 year ago
cert.go	all: update copyright and license headers	1 year ago
cli.go	cmd/tailscale: hide share subcommand	4 months ago
cli_test.go	all: use reflect.TypeFor now available in Go 1.22 (#11078)	4 months ago
configure-kube.go	all: use Go 1.21 slices, maps instead of x/exp/{slices,maps}	10 months ago
configure-kube_test.go	cmd/tailscale/cli: add "configure kubeconfig" subcommand	1 year ago
configure-synology.go	all: replace /kb/ links with /s/ equivalents	1 year ago
configure.go	cmd/tailscale/cli: update docs and unhide configure	1 year ago
debug.go	cli/debug: rename DERP debug mode (#11220)	3 months ago
diag.go	various: add detection and Taildrop for Unraid	1 year ago
diag_other.go	all: update copyright and license headers	1 year ago
down.go	all: update copyright and license headers	1 year ago
exitnode.go	cmd/tailscale/cli: add description to exit-node CLI command	5 months ago
exitnode_test.go	cli: introduce exit-node subcommand to list and filter exit nodes	10 months ago
file.go	cmd/tailscale: improve taildrop progress printer on Linux (#9878)	8 months ago
funnel.go	cmd/tailscale/cli: use status before doing interactive feature query	7 months ago
id-token.go	all: update copyright and license headers	1 year ago
ip.go	all: update copyright and license headers	1 year ago
licenses.go	cmd/tailscale: refactor shared utility methods	10 months ago
login.go	all: update copyright and license headers	1 year ago
logout.go	all: update copyright and license headers	1 year ago
nc.go	all: update copyright and license headers	1 year ago
netcheck.go	net/netcheck: use DERP frames as a signal for home region liveness	6 months ago
network-lock.go	all: implement lock revoke-keys command	10 months ago
ping.go	wgengine,ipn,cmd/tailscale: add size option to ping (#8739)	10 months ago
risks.go	util/testenv: add new package to hold InTest	10 months ago
serve_legacy.go	cmd/tailscale/cli: use status before doing interactive feature query	7 months ago
serve_legacy_test.go	cmd/tailscale/cli: use status before doing interactive feature query	7 months ago
serve_v2.go	cmd/tailscale/cli: run Watch with NotifyNoPrivateKeys (#10950)	4 months ago
serve_v2_test.go	all: cleanup unused code, part 2 (#10670)	5 months ago
set.go	cli/set: add printout when web client started	5 months ago
set_test.go	all: update copyright and license headers	1 year ago
share.go	cmd/tailscale: add node attribute instructions to share command help	3 months ago
ssh.go	cmd/tailscale/cli: pass "-o 'CanonicalizeHostname no'" to ssh	3 months ago
ssh_exec.go	all: update copyright and license headers	1 year ago
ssh_exec_js.go	all: update copyright and license headers	1 year ago
ssh_exec_windows.go	all: update copyright and license headers	1 year ago
ssh_unix.go	types/logger, cmd/tailscale/cli: flesh out, simplify some non-unix build tags	9 months ago
status.go	cmd/tailscale/cli: fix exit node status output (#11076)	4 months ago
switch.go	ipn/ipnlocal,cmd/tailscale: persist tailnet name in user profile	7 months ago
up.go	health: warn about reverse path filtering and exit nodes	3 months ago
update.go	clientupdate: add explicit Track to Arguments (#10548)	6 months ago
version.go	cmd/tailscale/cli,clientupdate: extract new clientupdate package (#8827)	10 months ago
web.go	cmd/tailscale: support clickable IPv6 web client addresses	4 months ago
web_test.go	client/web: extract web client from cli package	10 months ago
whois.go	cmd/tailscale/cli: document usage more clearly (#10681)	5 months ago