Tanayk07 5105033224 feat: add prominent warning banner for non-standard IP prefixes ...

Add a highly visible ASCII-art warning banner that is printed at
startup when the configured IP prefixes fall outside the standard
Tailscale CGNAT (100.64.0.0/10) or ULA (fd7a:115c:a1e0::/48) ranges.

The warning fires once even if both v4 and v6 are non-standard, and
the warnBanner() function is reusable for other critical configuration
warnings in the future.

Also updates config-example.yaml to clarify that subsets of the
default ranges are fine, but ranges outside CGNAT/ULA are not.

Closes #3055

2026-03-19 07:08:35 +01:00

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