การรั่วไหลของ IPv6 — มันคืออะไร และวิธีหยุดมัน

What is an IPv6 leak?

An IPv6 leak happens when IPv6 traffic from your device is sent outside the encrypted VPN tunnel, allowing websites or services to see your device’s real IPv6 address instead of the VPN-assigned IP. It differs from IPv4 leaks because IPv6 uses a separate addressing and routing layer that some VPNs may not handle by default.

Common causes of IPv6 leaks

• VPN clients that only tunnel IPv4 traffic
• Android OS networking behavior with dual-stack (IPv4 + IPv6)
• Misconfigured DNS or DNS requests sent over IPv6
• Split-tunneling or apps allowed to bypass the VPN

How an IPv6 leak looks to trackers

When an IPv6 leak occurs, trackers see your device’s IPv6 address, which can be linked to your ISP and approximate location. This breaks anonymity, undermines geo-unblocking, and may expose you to targeted content or logging.

Why IPv6 leaks matter on Android

Android devices increasingly use IPv6 by default when networks support it. Because IPv6 traffic can bypass IPv4-only VPN tunnels, Android users are particularly vulnerable. Mobile apps may make IPv6 requests directly, and system-level DNS can use IPv6 paths unless the VPN explicitly manages them.

Risks specific to Android

• Apps with direct network permissions may bypass VPN routing
• Carrier networks often prefer IPv6 and may leak metadata
• Default VPN implementations on Android can be IPv4-biased

Benefits of preventing IPv6 leaks

• Consistent IP masking (both IPv4 and IPv6)
• Reliable geo-unblocking and secure access
• Stronger privacy and reduced tracking

How Free VPN Grass prevents IPv6 leaks (How-To)

Technical methods used by Free VPN Grass

• IPv6 routing: routes IPv6 via the VPN tunnel when possible
• IPv6 blocking: drops IPv6 traffic if the tunnel can’t carry it
• Encrypted DNS and DNS over TLS/HTTPS to prevent DNS leaks
• Android VPN API integration to control network interfaces and enforce routes
• Kill switch to block traffic outside the VPN

By combining these methods, Free VPN Grass ensures IPv6 requests cannot escape the encrypted tunnel on Android devices.

How to test for IPv6 leaks on Android

Testing is the most reliable way to confirm protection. Use the following steps after enabling Free VPN Grass protections.

1. Connect to a VPN server in Free VPN Grass.
2. Open your Android browser and visit a reputable IP test site (e.g., test-ipv6.com or ipleak.net).
3. Run both IPv4 and IPv6 tests and check reported addresses.
4. If an IPv6 address is shown that matches your real ISP-provided IPv6, a leak exists.
5. If no IPv6 is reported or the IPv6 matches the VPN-assigned address, protection is working.

Repeat the test on Wi-Fi and mobile data to ensure carrier-level IPv6 doesn’t bypass the VPN.

Best practices & recommended settings

Use these settings and habits to minimize IPv6 leak risk on Android:

• Always keep Free VPN Grass updated to the latest version.
• Enable IPv6 protection and the kill switch in-app.
• Prefer servers with IPv6 support when available.
• Disable split-tunneling for apps that handle sensitive data.
• Use encrypted DNS (DoT/DoH) offered by the VPN.
• Test regularly after major Android updates or network changes.

These measures reduce the attack surface and ensure consistent tunneling of both IP protocols.

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