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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>		9 months ago
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art	…
connstats	…
dns	cmd/tailscaled, ipn/ipnlocal, wgengine: shutdown tailscaled if wgdevice is closed	9 months ago
dnscache	util/cmpx: delete now that we're using Go 1.22	10 months ago
dnsfallback	…
flowtrack	…
interfaces	net/interfaces: reduce & cleanup logs on iOS	9 months ago
ktimeout	net/ktimeout: add a package to set TCP user timeout	9 months ago
memnet	…
netaddr	…
netcheck	util/cmpx: delete now that we're using Go 1.22	10 months ago
neterror	…
netkernelconf	…
netknob	…
netmon	…
netns	…
netstat	…
netutil	health: warn about reverse path filtering and exit nodes	9 months ago
packet	…
ping	…
portmapper	…
proxymux	…
routetable	…
socks5	…
sockstats	…
speedtest	…
stun	…
stunserver	…
tcpinfo	…
tlsdial	…
tsaddr	all: remove LenIter, use Go 1.22 range-over-int instead	9 months ago
tsdial	all: remove LenIter, use Go 1.22 range-over-int instead	9 months ago
tshttpproxy	net/tshttpproxy: log when we're using a proxy	9 months ago
tstun	…
wsconn	…