If the results indicate it did not find the DHCP server on the network, check its static IP address configuration, ensure network interface controllers (NICs) are enabled, and so on. Refer to the organization's network diagram to ensure Nmap detects the nodes you expect to see. If it appears to have a legitimate IP address configuration, then it should be able to lease addresses. Good news: The network device hosting the DHCP service was detected. Run the scan from a connected device with a static IP address configuration.įor a basic ping sweep to identify available hosts on the 192.168.1.0/24 network, type: $ nmap -sn 192.168.1.1-255 Begin with a basic ping sweep that identifies all hosts on the segment. An Nmap scan verifies its identity on the network. One logical step is to confirm that the DHCP service device has a network presence. Once you've confirmed the above (including that there aren't any clues in the logs), follow the steps below to use network scanners and packet sniffers to display valuable troubleshooting information. Do the server and client logs display any clues as to why the leases fail? (If so, try to fix those issues before moving on.).
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