How do I open the dhcp-client log on Windows 7?

Solution 1:

Dhcp-Client logs its events to the Windows Event Log.

To view this, open the Event Viewer, expand the Windows Logs entry on the left and select System. Here all system messages are shown.

To view only Dhcp-Client entries, click "Filter Current Log…" on the right.

In the dialog resulting from this, expand the Event sources drop-down list, and find and select "Dhcp-Client". You may want to select "DHCPv6-Client", too, but that depends on what you're trying to achieve.

Solution 2:

Windows DHCP client logs are available in Event Viewer. Go to:

Event Viewer
  > Applications and Services Logs
    > Microsoft
      > Windows
        > Dhcp-Client
          > Microsoft-Windows-DHCP Client Events/Admin

If the log is empty, you may need to enable it first. Go to "Dhcp-Client", select "Microsoft-Windows-DHCP Client Events/Admin", then click on "Properties" in the right hand pane. Make sure the "Enable logging" option is checked.