Android 'no internet' fault traced to rogue IPv6 router advertisements from a 5G router

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A user found that their Android phone showed Wi-Fi as connected but without internet, while other devices worked normally. After isolating the problem, they traced it to a Huawei 5G router (CPE) that was broadcasting IPv6 router advertisements despite being set to LAN-only mode. Disconnecting the device made the phone's issue disappear, and reconnecting brought it back. The author explains that Android's connectivity check depends on reaching its servers, and that stray IPv6 gateway announcements can redirect the phone's traffic into a dead end. The article describes how to detect these advertisements using rdisc6 or tcpdump on the same network segment.

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