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Anton Tolchanov db34cdcfe7 cmd/tailscale/cli: add a risk message about rp_filter ... We already present a health warning about this, but it is easy to miss on a server when blackholing traffic makes it unreachable. In addition to a health warning, present a risk message when exit node is enabled. Example: ``` $ tailscale up --exit-node=lizard The following issues on your machine will likely make usage of exit nodes impossible: - interface "ens4" has strict reverse-path filtering enabled - interface "tailscale0" has strict reverse-path filtering enabled Please set rp_filter=2 instead of rp_filter=1; see https://github.com/tailscale/tailscale/issues/3310 To skip this warning, use --accept-risk=linux-strict-rp-filter $ ``` Updates #3310 Signed-off-by: Anton Tolchanov <anton@tailscale.com>		10 months ago
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example	tsnet: split user facing and backend logging	2 years ago
depaware.txt	cmd/tailscale/cli: add a risk message about rp_filter	10 months ago
example_tshello_test.go	tsnet: add examples (#8289)	3 years ago
example_tsnet_test.go	tsnet: split user facing and backend logging	2 years ago
packet_filter_test.go	tsnet: add test for packet filter generation from netmap	11 months ago
tsnet.go	tsnet: remove an expired configuration-path migration step (#16120)	11 months ago
tsnet_test.go	tsnet: use test logger for testcontrol and node logs	1 year ago