formerly University of Missouri-Rolla
Unknown Network Device

You are seeing this page because you requested a web page outside the campus network and your computer is not known to the network. There are a few reasons why this might be happening, here is what you can do about it.

  1. Pending security updates — All devices on the network must have any pending security updates installed.
    • All Operating Systems: Apply all security updates and reboot to finalize the process.  Visit the IT Walk-in Center in the Library or MinerTech in the Havener Center for assistance.
  2. Register all of your network devices — All network devices must be registered for use on the campus network. This includes computers, PDA's, wireless access points, routers, network printers, and any other device that is or will be connected directly to the campus network.
    • A laptop usually has two network addresses, one for the wired network and one for the wireless network. These must both be registered to the same name. To register a network device go to https://itweb.mst.edu/~netdb
  3. Use Dynamic Host Control Protocol (DHCP) — All network devices connected to the campus network should acquire a unique Internet address from the campus DHCP servers. Modern operating systems, such as Windows XP, Windows Vista and Mac OS X, use DHCP by default.
    • Windows XP: Open up the Network Connections control panel, right click on your network interface and select Properties. In the dialog that appears select Internet Protocol (TCP/IP) from the scrolling list. Click the Properties button. In the dialog that appears make sure that both "Obtain an IP address automatically" and "Obtain DNS server address automatically" are selected.
    • OS X: Open System Preferences (for example, from the Apple menu) and in the Internet & Network section click on the Network icon. Select the network device to configure (usually Built-in Ethernet and Airport). Under the TCP/IP button set "Configure IPv4" to "Using DHCP". Click the "Apply Now" button.
    • Linux: due to the many varieties of linux there are many ways of configuring DHCP. Popular distributions such as Red Hat, Mandrake, SuSE and Ubuntu use DHCP by default. To verify or reconfigure this please consult the documentation that comes with your linux distribution.
  4. Use a current Internet address — When using DHCP an Internet Protocol (IP) address is obtained from a DHCP server and is only good for a certain number of hours. This is necessary in a dynamic environment where computers come and go. Consequently just obtaining an IP address from the DHCP server is not sufficient: it must renew the address every so often. This renewal is normally automatic, but sometimes a system will stop talking with the DHCP server. On different operating systems there are different steps that can be taken to renew the IP address, but regardless of operating system a foolproof method is to reboot the device.
    • Windows XP: Click on Start, Run and type in the command "cmd" (without the quotes). This will being up a DOS command prompt, type in the command "ipconfig /renew"
    • Linux: due to the many varieties of linux there are many ways of renewing DHCP. To renew a DHCP lease please consult the documentation that comes with your linux distribution.
    • All Operating Systems: when configured to use DHCP rebooting the device will cause a new IP address to be acquired.
  5. If all else fails — Contact the Missouri S&T IT Help Desk at (573) 341-HELP, submit an online Help Request, or bring your system to the IT Walk-in Center on the ground floor of the Library for assistance.