---
title: "OpenVPN Leak Protection: DNS, Routes, and Kill Switch"
url: "https://astraguardvpn.com/blog/openvpn-leak-protection-dns-routes-kill-switch"
description: "OpenVPN leak protection guide: DNS options, routes, kill switch, and AstraGuard .ovpn best practices."
updated: "2026-07-21T00:42:22.507Z"
---

# OpenVPN Leak Protection: DNS, Routes, and Kill Switch

Configure OpenVPN so DNS and traffic stay inside the tunnel — and fail closed if the VPN drops.

Configure OpenVPN so DNS and traffic stay inside the tunnel — and fail closed if the VPN drops. Why OpenVPN still leaks OpenVPN is mature, but client OS DNS and route tables decide the outcome. Missing redirect-gateway , ignored pushed DNS, or IPv6 side paths create leaks. Critical directives Ensure the profile receives VPN DNS ( dhcp-option DNS ), full routes, and that the client applies them. On Linux, integrate with resolvconf/systemd-resolved correctly. Kill switch patterns Firewall rules that allow only the VPN interface outbound traffic prevent exposure during reconnects. Without a kill switch, a brief drop can send packets in the clear. AstraGuard OpenVPN tips Download fresh .ovpn from the dashboard, import into OpenVPN Connect or Tunnelblick, connect, then run leak tests. Full guide: OpenVPN guide . Troubleshooting If DNS still shows ISP servers, flush caches, disable conflicting DoH, and confirm no second active VPN. Retest on a clean network. Protect yourself with AstraGuard VPN AstraGuard VPN helps keep DNS inside the tunnel with strong encryption, kill switch options, and simple setup on desktop and mobile. Create an account , pick a plan on packages , then verify on privacy tools .

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