Troubleshooting
Network diagnostics
Methodically identify the cause of a failure before changing the configuration.
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IP address 169.254: why and how to restore the network
A 169.254.x.x address usually indicates that the device has not received an IPv4 configuration from the DHCP server.
Diagnose →?
Resolve an IP address conflict on a local network
A conflict occurs when two interfaces use the same address simultaneously on the same network.
Diagnose →?
Double NAT or CGNAT: Identifying the Cause
Double NAT is usually found in your home; the CGNAT adds a translation in the operator's network.
Diagnose →?
IPv6 Not Working: Diagnostic Method
An IPv6 outage can come from carrier access, router, addressing, DNS, or firewall.
Diagnose →?
VPN does not change the displayed IP address
If the public address remains the same, traffic may not travel through the expected tunnel or use a different network stack.
Diagnose →?
Inaccessible ports: diagnose without exposing your network
An inbound port requires listening service, a consistent firewall, and a routable path to the device.
Diagnose →