tailscale/health/healthmsg/healthmsg.go
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>
2024-02-27 00:43:01 +00:00

16 lines
727 B
Go

// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
// Package healthmsg contains some constants for health messages.
//
// It's a leaf so both the server and CLI can depend on it without bringing too
// much in to the CLI binary.
package healthmsg
const (
WarnAcceptRoutesOff = "Some peers are advertising routes but --accept-routes is false"
TailscaleSSHOnBut = "Tailscale SSH enabled, but " // + ... something from caller
LockedOut = "this node is locked out; it will not have connectivity until it is signed. For more info, see https://tailscale.com/s/locked-out"
WarnExitNodeUsage = "The following issues on your machine will likely make usage of exit nodes impossible"
)