fix: 限制边缘节点仅使用 IPv4 并记录维护约定
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@@ -32,6 +32,7 @@ Every item here cost real debugging time on a live deployment. They are ordered
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## Cloudflare WARP
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- **Disabling host IPv6 does not disable IPv6 inside WARP's proxy tunnel.** Keep the IPv4-only guards in Xray and sing-box: force IPv4 domain resolution and reject `::/0` before WARP routing. `UseIPv4` can fall back to system resolution in Xray; use `ForceIPv4`. Do not pass unresolved target domains to WARP. See [fleet policy](../../../../docs/EDGE-IPV4-ONLY.md).
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- **`gpg` must be installed first.** On a minimal Debian, `gpg --dearmor` for the repo keyring fails with `gpg: command not found`, and the later `apt update` then errors `Failed to parse keyring … sqv returned an error code`. `apt-get install -y gnupg` before adding the repo.
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- Use the **`bookworm`** repo line even on Debian 13 (trixie) — the bookworm package works.
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- **WARP can lie about being connected.** The control plane shows `Connected` while the SOCKS proxy stops egressing. The watchdog (`warp-healthcheck.*`) checks `warp=on` *through the proxy* and restarts `warp-svc` when it isn't.
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