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tailscale/cmd
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>
9 months ago
..
addlicense all: update tools that manage copyright headers 2 years ago
build-webclient client/web: precompress assets 12 months ago
cloner cmd/cloner: fix typo in test type's name 1 year ago
connector-gen cmd/connector-gen: add helper tool for wide app connector configurations 12 months ago
containerboot cmd/{containerboot,k8s-operator/deploy/manifests}: optionally allow proxying cluster traffic to a cluster target via ingress proxy (#11036) 10 months ago
derper cmd/derper: apply TCP keepalive and timeout to TLS as well 9 months ago
derpprobe prober: migrate to Prometheus metric library 2 years ago
dist cmd/dist: update logs for synology builds 10 months ago
get-authkey util/cmpx: delete now that we're using Go 1.22 10 months ago
gitops-pusher cmd/gitops-pusher: only use OAuth creds if non-empty string 10 months ago
hello cmd/hello: link to the Hello KB article (#11022) 10 months ago
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mkmanifest cmd/mkmanifest, cmd/tailscale, cmd/tailscaled: remove Windows arm32 resources from OSS 2 years ago
mkpkg go.mod: upgrade nfpm to v2 (#8786) 1 year ago
mkversion version/mkversion: open-source version generation logic 2 years ago
nardump all: update copyright and license headers 2 years ago
netlogfmt util/cmpx: remove code that's in the stdlib now 11 months ago
nginx-auth tailcfg,all: add and use Node.IsTagged() 2 years ago
pgproxy various: add golangci-lint, fix issues (#7905) 2 years ago
printdep cmd/printdep: print correct toolchain URL 2 years ago
proxy-to-grafana tailcfg,all: add and use Node.IsTagged() 2 years ago
sniproxy go.mod, all: move away from inet.af domain seized by Taliban 10 months ago
speedtest all: update copyright and license headers 2 years ago
ssh-auth-none-demo all: replace deprecated ioutil references 1 year ago
stunc all: update copyright and license headers 2 years ago
stund util/cmpx: delete now that we're using Go 1.22 10 months ago
sync-containers all: adjust some build tags for plan9 1 year ago
tailscale health: warn about reverse path filtering and exit nodes 9 months ago
tailscaled cmd/tailscaled, ipn/ipnlocal, wgengine: shutdown tailscaled if wgdevice is closed 9 months ago
testcontrol all: update copyright and license headers 2 years ago
testwrapper cmd/testwrapper: apply results of all unit tests to coverage for all packages 9 months ago
tsconnect all: remove LenIter, use Go 1.22 range-over-int instead 9 months ago
tsidp cmd/tsidp: add start of OIDC Tailscale IdP 1 year ago
tsshd all: update copyright and license headers 2 years ago
viewer cmd/cloner: add regression test for slice nil/empty semantics 1 year ago