ID:
INET6_VPN_INTERFACECategory: Interfaces Status in RKNHardering 2.10.0: Active check Role in the verdict: High
This page describes the actual implementation in RKNHardering 2.10.0. It distinguishes what can be done without root, what requires root, and where a mitigation only reduces one signal without hiding the VPN as a whole.
detectVpnInterfaces() iterates over the exact names tun0, tun1, utun0, utun1, wg0, wg1, ppp0, and xfrm0. Both ifaceExists() and a second SIOCGIFFLAGS call must succeed; the detail includes the name and flags. The kind is legacy high confidence.
A fixed name exists and is accessible through the SIOCGIFFLAGS socket ioctl.
This is a strong but narrow name-based signal. Despite the historical inet6 name, the check is not limited to IPv6 and does not read an address; it performs an AF_INET ioctl for flags.
How the line affects the report: The line sets detected=true and is treated as a high-confidence local indicator.
A renamed or nonstandard interface is not in the list; the main pattern, type, or netlink checks may still find it. The page title does not fully match the implementation.
This line must be evaluated together with neighboring signals. A clean result from a single API does not simultaneously cover Java Binder, libc, raw netlink/syscalls, procfs/sysfs, local sockets, and server-side indicators.
The most reliable non-root approach is not to create a VPN interface on the phone being tested: move the tunnel to a router, travel router, separate gateway phone, or another network node. Per-app bypass in VpnService changes the route used by the selected app, but establish() still creates a system VPN interface, so local interface checks may continue to trigger. A local HTTP/SOCKS proxy mode without TUN can sometimes remove this specific vector, but it leaves listening ports and proxy settings and does not cover apps that ignore the proxy.
Laboratory-grade hiding usually requires a system Java layer and one native backend. With VPNHide, this means the APK plus Vector/LSPosed scoped only to System Framework, and exactly one of kmod, KPM, or Zygisk. For a check that may use a direct syscall or netlink, kmod/KPM is preferable: a userspace Zygisk hook can be bypassed and leaves traces inside the process. Review the VPNHide coverage map first, and download builds only from the official release page. VPNHide Next claims broader coverage, but also warns about possible boot loops and kernel panics; it should be tested only on a test device. The backend must intercept SIOCGIFFLAGS, not only getifaddrs.
for i in tun0 tun1 utun0 utun1 wg0 wg1 ppp0 xfrm0; do adb shell ip link show "$i" 2>/dev/null; done
After any change, force-stop both RKNHardering and the VPN client, start them again, and repeat the full scan. Zygisk, Xposed, and kernel modules usually require a reboot. Compare not only this line but also neighboring signals: a partial hook often creates inconsistencies between APIs.
The probe itself runs with ordinary app permissions and does not request root. The ADB commands below are for orientation only: adb shell runs under a different UID and may see either more or less than the app process. The decisive test is to run the check again after a force-stop.
An inconsistent ioctl error can create a JVM/native mismatch and an ifindex oracle.
Revert the most recent change: disable the added module or rule through its normal manager, reboot the device, and repeat the baseline scan. Do not layer another hook on top of an unknown state.
High. Verified against the exact tunNames list and the two SIOCGIFFLAGS calls; the kind is high confidence.
The status of a third-party solution does not automatically carry over to this device. A module developer’s claim is only the initial hypothesis; confirmation requires a reproducible RKNHardering result on the specific Android version, firmware, and kernel.
native_signs_probe.cpp — native probe implementation.NativeSignsChecker.kt — main native/legacy verdict logic.NativeSignalId.kt — complete ID registry.NativeSignalCatalog.kt — category, slug, and line mapping.Related signals: interface-enumeration, ifindexname-vpn, getifaddrs-vpn.