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wgengine/router: print Docker warning when stateful filtering is enabled
When Docker is detected on the host and stateful filtering is enabled, Docker containers may be unable to reach Tailscale nodes (depending on the network settings of a container). Detect Docker when stateful filtering is enabled and print a health warning to aid users in noticing this issue. We avoid printing the warning if the current node isn't advertising any subnet routes and isn't an exit node, since without one of those being true, the node wouldn't have the correct AllowedIPs in WireGuard to allow a Docker container to connect to another Tailscale node anyway. Updates #12070 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: Idef538695f4d101b0ef6f3fb398c0eaafc3ae281 (cherry picked from commit 5708fc0)
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