If the computer receives an IPv4 address starting with 169.254, this may indicate that it is not receiving the expected DHCP configuration. Examine the link layer first, then address distribution.
Basic approach
IPv4 link-local addresses are designed for communication on the same link; It is not intended for general access via routers. IPv6 may be running next to such an address. Therefore, not every successful request in the browser proves that the IPv4 configuration is healthy.
Application steps
- Check the Ethernet link light or Wi-Fi connection status.
- Examine the correct adapter, DHCP status, and default gateway in the ipconfig /all output.
- Compare whether another client on the same network has received an address; then check the DHCP server and VLAN access.
Practical example
If only one desktop in an office is using 169.254 and the device next to it is receiving 192.168.20.15, focus on the cable, switch port and client configuration first. If all clients are affected, the common DHCP route is a more meaningful start.
Interpret the result correctly
Don't cover it up by typing in a random 192.168 address; incorrect subnet or address conflict may occur. This symptom alone does not prove a modem malfunction. Server logs and client output should be evaluated together.
Source and follow-up reading
Protocol or command details: RFC 3927. The steps and example scenario are IPScans editorial narrative.