UConn CSE 5300 - Measurement (35 pages)

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Measurement



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Measurement

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Pages:
35
School:
University Of Connecticut
Course:
Cse 5300 - Advanced Computer Networks

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Roadmap So far basics of wireless networks Physical layer characteristics What happens at source receiver in air MAC MAC for 802 11 WLAN MAC for sensor networks Routing For ad hoc networks Optimization based approach For DTNs 1 Roadmap Advanced topics in wireless networks Measurement Management Security issues Fault tolerance issues or mobility issues 2 Network Measurement motivation measurement strategies active passive sampling 3 Motivation service providers service users monitoring anomaly detection debugging traffic engineering pricing peering service level agreements researchers designers software developers architecture design application design 4 Active measurements active probe tools send stimulus packets into network measure response network transport application layer probes can measure many things delay loss topology routing behavior bandwidth throughput earliest tools use Internet Control Message Protocol ICMP 5 ping uses ICMP Echo capability C WINDOWS Desktop ping www soi wide ad jp Reply from 203 178 137 88 bytes 32 time 253ms TTL 240 Reply from 203 178 137 88 bytes 32 time 231ms TTL 240 Reply from 203 178 137 88 bytes 32 time 225ms TTL 240 Reply from 203 178 137 88 bytes 32 time 214ms TTL 240 Ping statistics for 203 178 137 88 packets Sent 4 Received 4 Lost 0 0 loss approximate round trip times in milliseconds Minimum 214ms Maximum 253ms Average 230ms 6 traceroute diagnostic tool in widespread use by users and providers finds outward path to given host round trip times along path 7 Example traceroute for n 1 2 nmax send pkt with TTL n pkt dies at nth router router returns ICMP pkt with router address traceroute to mafalda inria fr 128 93 52 46 30 hops max 38 byte packets 1 cs gw 128 119 240 254 0 924 ms 0 842 ms 0 847 ms 2 lgrc rt 106 8 gw umass edu 128 119 3 154 1 089 ms 0 633 ms 0 499 ms 3 border4 rt gi 7 1 gw umass edu 128 119 2 194 0 914 ms 0 589 ms 0 647 ms 12 13 14 15 inria g3 1 cssi renater fr 193 51 180 174 85 851 ms 85 930 ms 85 677 m royal



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