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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>		8 months ago
..
ip_forward.go	health: warn about reverse path filtering and exit nodes	8 months ago
netutil.go	all: cleanup unused code, part 2 (#10670)	11 months ago
netutil_test.go	health: warn about reverse path filtering and exit nodes	8 months ago
routes.go	net/netutil: allow 16-bit 4via6 site IDs	10 months ago