CS536-2009-04-02

CS536-2009-04-02 - CS536: Network Layer Charles Killian...

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Unformatted text preview: CS536: Network Layer Charles Killian Transport Layer 1 Announcements Mid-Term Grading Done! Homework Assignments #3 Assigned ASAP (tonight, tomorrow morning) (due 4/14) Chapter 4 #4 Assigned 4/16 (due 4/28) Chapter 5 Final Project (due 4/30) Topic due 4/9 by email, details ASAP. ~7 Page survey paper No original research Final Exam Review (4/30) Network Layer 4-2 Reading Assignments [NOW] Chapter 4 [4/7] Craig Labovitz, Abha Ahuja, Abhijit Abose, Farnam Jahanian, An Experimental Study of Delayed Internet Routing Convergence. SIGCOMM 2000. [4/15] P. Newman, G. Minshall, and T. Lyon. IP Switching: ATM Under IP . IEEE/ACM Trans. on Networking, 6(2):117-129, 1998. Chapter 5 (at end of chapter 4, roughly 4/9). Network Layer 4-3 Network Layer 4-4 DHCP: Dynamic Host Configuration Protocol Goal: allow host to dynamically obtain its IP address from network server when it joins network Can renew its lease on address in use Allows reuse of addresses (only hold address while connected an on) Support for mobile users who want to join network (more shortly) DHCP overview: host broadcasts DHCP discover msg DHCP server responds with DHCP offer msg host requests IP address: DHCP request msg DHCP server sends address: DHCP ack msg Network Layer 4-5 DHCP client-server scenario 223.1.1.1 223.1.1.2 223.1.1.3 223.1.1.4 223.1.2.9 223.1.2.2 223.1.2.1 223.1.3.2 223.1.3.1 223.1.3.27 A B E DHCP server arriving DHCP client needs address in this network Network Layer 4-6 DHCP client-server scenario DHCP server: 223.1.2.5 arriving client time DHCP discover src : 0.0.0.0, 68 dest.: 255.255.255.255,67 yiaddr: 0.0.0.0 transaction ID: 654 DHCP offer src: 223.1.2.5, 67 dest: 255.255.255.255, 68 yiaddrr: 223.1.2.4 transaction ID: 654 Lifetime: 3600 secs DHCP request src: 0.0.0.0, 68 dest:: 255.255.255.255, 67 yiaddrr: 223.1.2.4 transaction ID: 655 Lifetime: 3600 secs DHCP ACK src: 223.1.2.5, 67 dest: 255.255.255.255, 68 yiaddrr: 223.1.2.4 transaction ID: 655 Lifetime: 3600 secs Network Layer 4-7 IP addresses: how to get one? Q: How does network get subnet part of IP addr? A: gets allocated portion of its provider ISPs address space ISP's block 11001000 00010111 0001 0000 00000000 200.23.16.0/20 Organization 0 11001000 00010111 0001000 0 00000000 200.23.16.0/23 Organization 1 11001000 00010111 0001001 0 00000000 200.23.18.0/23 Organization 2 11001000 00010111 0001010 0 00000000 200.23.20.0/23 ... .. . . Organization 7 11001000 00010111 0001111 0 00000000 200.23.30.0/23 Network Layer 4-8 Hierarchical addressing: route aggregation Send me anything with addresses beginning 200.23.16.0/20 200.23.16.0/23 200.23.18.0/23 200.23.30.0/23 Fly-By-Night-ISP Organization 0 Organization 7 Internet Organization 1 ISPs-R-Us Send me anything with addresses beginning 199.31.0.0/16 200.23.20.0/23 Organization 2 ....
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CS536-2009-04-02 - CS536: Network Layer Charles Killian...

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