Connected to Wi-Fi but no internet: work out where the problem is
Find out whether a Wi-Fi problem affects one device, the whole network or one service before changing settings.
Wi-Fi and connectivity
Wi-Fi and connectivity
Networks, internet connections, VPNs and remote access.
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1 guide
Everyday Connectivity
Work out whether a connection problem belongs to one device, the local network or a particular service.
Back to the category map4 guides
Linux Operations
Diagnose Linux services, storage, networking, permissions and lifecycle from current state and distribution-appropriate evidence.
Back to the category mapLinux DHCP services
DHCP looks simple when it works: a device joins a network and receives an address. Understand the moving parts of a Linux DHCP service.
Open-source network availability and traffic monitoring
A monitoring server that collects thousands of green metrics can still miss the outage a user cares about.
Packet capture and network discovery on Linux
Network tools become useful when the question is narrower than the output.
Replace a Legacy Squid Proxy and SARG Reporting Without Losing Visibility
An old web proxy often survives because nobody knows which part of it the business still needs.
1 guide
Network Architecture
Understand capacity, paths and boundaries before comparing claims or changing infrastructure.
Back to the category mapChina's 1.2-Tbit/s Research Backbone: What the ‘World's Fastest’ Claim Actually Meant
Revisit the 2023 FITI announcement without the superlatives: what 1.2 Tbit/s described, how a research backbone differs from household internet, and how to compare network-speed records honestly.
8 guides
Networking and Remote Access
Locate the failed link across local access, addressing, DNS, routing, policy and the remote service itself.
Back to the category mapBusiness VPN design and diagnosis
A VPN is not a magic private network. It is an authenticated encrypted path plus routes and policy.
Business Wi-Fi access-point recovery and administration
Recover administrative control of a business access point without erasing the only useful configuration.
Firewall routing, URL policy and application access
An application does not pass through “the firewall” as one yes-or-no event. Trace one failed application flow across DNS.
First-Response Network Checks for Time, Reachability, DNS, and Routing
The fastest safe diagnosis begins by making the complaint precise.
SoftEther and L2TP remote access
“SoftEther VPN” can describe several materially different access paths. One deployment may use the SoftEther client and protocol.
VLANs Explained: Access Ports, Trunks, Tags, and First Checks
A VLAN creates a separate Layer 2 broadcast domain on switching infrastructure.
VoIP deployment and nuisance-call diagnosis
A VoIP call can ring correctly and carry no audio. It can register successfully and fail only for outbound calls.
WireGuard on Windows
WireGuard is deliberately small. It creates an encrypted IP tunnel between peers that possess the right keys.
2 guides
Windows Operations
Diagnose Windows from effective configuration, logs and lifecycle state before applying repair commands or broad resets.
Back to the category mapWindows IP, DNS, routes and network profiles
” It chooses among interfaces, addresses, routes, DNS rules and firewall profiles for every connection.
WinRM, RDP and remote administration
Remote administration is not one control. Design and diagnose Windows remote administration without exposing RDP or WinRM directly to the public internet.
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