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University of Michigan Residence Halls Networking System

A 3-tier system for in-room student registration, automated and secure, utilizing CGI, Oracle Daemon, and Java Client. DHCP-based with SSL-protected web interface for user data submission. Efficient IP allocation, automated DHCP configuration updates.

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University of Michigan Residence Halls Networking System

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  1. University of Michigan Residence Halls Networking In-Room Student Registration System http://www.umich.edu/~insite

  2. Overview • 3-tier system (Web/CGI, Oracle Daemon, Java Client) • DHCP-based • Automated - users provide minimal data • Secure - interface-to-daemon communications are encrypted

  3. Communications • Campus routers configured to forward DHCP requests to single server • DHCP server issues 10.x.x.x addresses, based on network of request origin • User connects to internal SSL-protected web page • CGI obtains uniqname, MAC, network origin and sends information (protected by Kerberos) to the Oracle daemon

  4. Communications (cont) • Oracle daemon matches uniqname to prestuffed student housing data • Database maintains linkage between user/location data and MAC/IP address • Cron job reads Oracle information and generates a new DHCP configuration file • ISC DHCPD server restarted every five min

  5. Registration Diagram

  6. Diagram Guide • Client requests IP from DHCP server; server responds with a 10.x.x.x address • Client contacts internal, SSL-protected webpage; CGI uses kerberos to authenticate and verify the username and password • The CGI sends uniqname, IP address, and OS to the SQL daemon; • Sqld does an ARP lookup on the router to determine the MAC address • Sqld queries the Group Server to determine if user is allowed to access this specific network • Sqld attempts to associate username with prestuffed user location data; if this is not successful, it attempts to fill this data by doing and LDAP query to X.500 • If the registration is successful, a new entry is added to the DHCP configuration file, and the client machine is assigned a real, routed IP address which replaces the unrouted 10.x.x.x address. • The Java client is an administration tool that allows network administrators to use a GUI to configure and partitions subnets, and to make modifications to student data and IP assignments.

  7. Deployment Results

  8. Drawbacks • Users can bypass DHCP and assign themselves a static IP • DHCP server must be restarted for updates to take place • Users must go to a specific URL to complete the registration • Users can not have network access on another network without administrative intervention

  9. Advantages • Efficient use of IP space • Students are not required to know the MAC address of their NIC • Contact/location info is gathered from reliable source rather than having students or consultants enter the data • Requires very little administration time beyond initial configuration of networks

  10. Future Directions • Improved access control through use of V-LAN configurable switches • More feedback and options in the CGI, allowing users to submit changes to their registration • Continued development of the java administration tool • Modularization of code • Allow machines to “roam” on allowed networks

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