1. Low Carbon ICT Services Kang Tang Kang.tang@oerc.ox.ac.uk Oxford e-Research Centre

2. Why computers are left switched ON? So they can be accessed remotely For system update or backup For use in distributed computing experiments(Campus Grid) For use as service provider Careless or bad memory

3. Wake on LAN (WOL) A technology that allow you to switch on a computer remotely Originally from Intel & IBM in 1997 Supported by most modern hardware Magic Packet: 6 bytes of ones +16xMAC WOL over internet Simple but useful

4. Institutional WOL service overview Central server as single user front end Gateway servers in local subnets Identify node by physical address (MAC) Integration with institutional SSO Mandatory registration Secured inter-server communication (HTTPS) Integration with 3 rd party services (WS) Scalability and extensibility

5. WOL Central Server Interface HUMAN MACHINE CENTRAL SERVER 3 rd PARTY SERVICES SOAP HTTP REQ BROWSER WS-SECURITY KEBEROS

6. WOL Gateway Department only need to install gateway server Required for each subnet Broadcast magic packets locally Secured communications with central server Available as VMware appliance for both Linux and windows Low hardware requirement

7. WOL Service in Oxford Registration Server Gateway Central WOL Server HFS Service Gateway WebAuth SSO OUCS

8. WOL user interface

9. Monitoring Service Motivation – Evaluate adoption of WoL – Better monitoring, better control – Make better use of existing infrastructure Share exactly same gateway as WoL Can be turned on easily on gateway Integration with SSO Attributes based authorization Privacy concern

10. Monitoring service at Oxford Gateway Monitoring Server Gateway WebAuth SSO Oak LDAP

11. Real-time subnet status chart

12. More Information http://www.oucs.ox.ac.uk/wol/ http://projects.oucs.ox.ac.uk/lowcarbonict/ Kang.tang@oerc.ox.ac.uk