1. OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH OASIS – Open Access Server In Subnet

2. Communication Systems Design 2002 KTH Agenda of the presentation The project team’s members Open Access Networks’ background Existing system Team achievements Project management Conclusions Questions and answers Introduction Background Existing system Solution Management Conclusions Q & A

3. OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH Who we are Adrian Mahdavi Ke ”Kurt” Chen Staffan Dahlberg Yidan ”Edward” Zhou Gilles Grandfils Introduction Background Existing system Solution Management Conclusions Q & A

4. OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH Open Access Network Concept Introduction Background Existing system Solution Management Conclusions Q & A Operator-neutral network !Traditional architechture

5. OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH OASIS’ position Goal : To scale ( extend via subnetting, in terms of the amout of networks and users connected, with the least loss of performance ) an existing Open Access Network. Introduction Background Existing system Solution Management Conclusions Q & A

6. The existing system design Introduction Background Existing system Solution Management Conclusions Q & A

7. Why does it need to be expanded ? Introduction Background Existing system Solution Management Conclusions Q & A Open.Net in It-university is expanding, Open.Net concept will cover Kista gallerian, Kista etc. More WLAN:s More ISP connections More different user types OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH

8. How to expand ? Expand the access network by routers No(need MAC) Expand the access network by Ethernet expansion? No(local broadcast flooding) Replace the current access control with access control applications? No(extra client-end software) OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH Introduction Background Existing system Solution Management Conclusions Q & A

9. How to solve the problem ? Multiple options could be used Packet marking, tokens IPv6 PPP over Ethernet VPN OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH Introduction Background Existing system Solution Management Conclusions Q & A

10. Two possible solutions Ethernet over IP Make a tunnel between routers, directly send Ethernet frames to the backbone. Authentication in subnet The router in the subnet acts as a firewall. Trust relationship with the ISP’s firewall. OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH Introduction Background Existing system Solution Management Conclusions Q & A

11. Our choice Ethernet over IP There will be problems with all solutions, this solution should have the least problems. Advantages : Easy network system configuration Controlled broadcasting flooding by our “magic” OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH Introduction Background Existing system Solution Management Conclusions Q & A

12. The design MAC Data Introduction Background Existing system Solution Management Conclusions Q & A

13. Limitations of the design Users can not actively open a connection to backbone or non Ethernet over IP subnets. Broadcast messages in the backbone may flood the subnets. OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH Introduction Background Existing system Solution Management Conclusions Q & A

14. OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH Time plan Planning janfebmaraprmaj Literature study Design Implementation Testing Techn. Ref. Release Pres. Introduction Background Existing system Solution Management Conclusions Q & A Mid-term

15. OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH Feedback of the planning Good to divide responsibilities Including optional goals Not enough checkpoints More time for deliverables Introduction Background Existing system Solution Management Conclusions Q & A

16. OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH Encountered problems Communication: Means of communication Individualism: Divergent expectations on the project Introduction Background Existing system Solution Management Conclusions Q & A

17. OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH Used solutions Communication: Use the right means of communication Use a more direct way (phone / private meetings) Introduction Background Existing system Solution Management Conclusions Q & A

18. OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH Used solutions Individualism: First we used an organic structure Creative but messy More mechanical structure needed Organized but constrained Introduction Background Existing system Solution Management Conclusions Q & A

19. OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH Things learnt Communication is the key Find a good trade-off between organic and mechanical structures Introduction Background Existing system Solution Management Conclusions Q & A

20. OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH Things to share with other groups Strong knowledge about Open Access Server Particularly about involved techniques (GRE tunnelling, Ethernet over IP etc) Introduction Background Existing system Solution Management Conclusions Q & A

21. OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH Things needed from other groups Requirements from ISP:s, CSP:s and users for future work. Introduction Background Existing system Solution Management Conclusions Q & A

22. OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH What you should remember Scalable Operator-neutral Access network Technique : Ethernet over IP Management : Trade-off between Organic & Mechanical group structure Introduction Background Existing system Solution Management Conclusions Q & A

23. OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH Question & Answers Now, It is time for discussion ! Introduction Background Existing system Solution Management Conclusions Q & A Your questions ! or... Hot Topics : Management details Systems’ login scenarios Security issues

24. Tech Notes for Q&A

25. OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH Notes: System Component Definition Registration(Configure) server: Provide service for registration end- user ISP preference DHCP relay: Provide dynamic end-user IP address configuration according to the user’s ISP configuration. Dynamic Filtering Firewall: Control the traffic flow from the open access network to ISPs according to the combination of end user’s MAC and IP Access Server: According to the user’s registration, send control request to filtering firewall and detect the online status of end users MAC-ISP DB server: store the user ’ s ISP preference and related mapping information Question & Answer (Tech)

26. OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH Notes: System Function View Qusetion & Answer (Tech)

27. Notes: Solution Design Outline Use Ethernet over IP to connect the access subnet and the backbone. Prevent broadcasting from subnet to backbone. Allow broadcasting from backcone to subnet. Each access subnet has an address server that responds to ARP requests for IP addresses of well known services (public services and ISP firewall). Each access subnet has a DHCP relay OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH Question & Answer (Tech)

28. OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH Notes: Solution Scenario Central DHCP replay Access Relay Subnet DHCP replay ISP DHCP Server Access Server Default DHCP Server MAC-ISP DB ISP Authen Server User ARP phantom Fire Wall Question & Answer (Tech)

29. Management Notes for Q&A

30. OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH Notes: Keys of teamwork Because a team is not just a set of individuals put together Aim: guide the group’s production to meet the best efficiency Question & Answer (Manage)

31. OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH Notes: Project Achievement Goals until mid-term Project plan Literature study paper Lessons learned paper Proposition of design Results = All achieved Question & Answer (Manage)

32. OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH Notes: Next Step Complete the design Implementation in test bed Testing Optional – Technical refinements Question & Answer (Manage)

33. OASIS – Open Access Server In Subnet Communication Systems Design 2002 KTH Notes: Project Time Usage Plan hours 400 800 1200 JanFebMar Question & Answer (Manage)