tailscale

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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>

2025-06-10 07:38:06 +01:00

example

tsnet: split user facing and backend logging

2024-05-10 15:29:13 -07:00

depaware.txt

cmd/tailscale/cli: add a risk message about rp_filter

2025-06-10 07:38:06 +01:00

example_tshello_test.go

tsnet: add examples (#8289 )

2023-07-19 12:36:49 -04:00

example_tsnet_test.go

tsnet: split user facing and backend logging