???? Router ?????

1
Internet Streaming Media UDP-based???????

• ????????
• ???
• Dec, 2002

2
????

• 1.??
• 2.????
• 3.Prevalent UDP Application
• 4.Streaming Media????
• 5.Video Game ????
• 6. Streaming Traffic????
• 7.????????
• 8.??

3
1.??

• Streaming Media Traffic over Internet
• 1970???audio conference
• 1990????? Mbone Video Conference
• variable delay Internet
• Constant Bit Rate (CBR) traffic
• ?????????streaming ?????????
• ??Audio/Video????,?????????
• Internet????free ????
• ??????????????.

4

• ???Streaming media UDP??
• ????????????,?? TCP ????,??traffic congestion
• ?????????
• ??streaming media ? transportation features
• ??/?? streaming media????????
• ??????????
• Capacity planning
• Packet Classification

5
2.????

• Internet Traffic Measurement
• LAN Traffic Measurement
• gathered packet-based traffic logs through
  tcpdump.
• Provide traffic measurement over one broadcast
  segment
• Each traffic log recording the transportation
  information of each packet
• TimeStamp
• Src_ip.src_port gt dst_ip.src_port
• bytes
• Transportation protocol

6
????(cont.)

• Barnet B. G.
• measured traffic of an Ethernet segment
• approximately 79 of the total Ethernet traffic
  in bytes was NFS traffic.
• Kushida Takayaki
• gathered traffic logs over FDDI backbone through
  tcpdump
• The measurement result reveals that
• about 98.2 of the traffic was TCP traffic.

7
????(cont.)

• WAN Traffic Measurement
• Thompson Kevin et al.
• Measured wide-area Internet traffic on an OC3
  trunk within MCI ATM backbone using OC3MON
• TCP is the dominant protocol on the link about
  95 of the bytes.
• UDP is the second most dominant, with roughly 5
  of the bytes,DNS dominates the total UDP traffic.

8
????(cont.)

• Measuring WAN traffic using NetFlow or SFlow
  transportation traffic log gathered from router
• WAN router??Internet??
• router????????????header
• ???flow??????,????? Collect PC
• Collecting PC ?? flow-tools shareware,???????
  netflow logs (per-10-min)
• ??region network ??????????

9
????(cont.)

• Light-Weight Netflow traffic logs recording
• flow identifier
• source IP address, source port,
• destination IP address, destination port
• protocol identifier
• packet count, byte count,
• source?destination interface identifier.

10
????(cont.)

• Transit Traffic Log providing
• ??flow???????
• ??Top-N user traffic (IP-based)
• src_ip, dst_ip
• source/ destination interface
• protocol identifier
• ?????TCP? UDP ??/????
• ????????????
• source port, destination port

11
????(cont.)

• Art Mena et al.
• Tcpdump ?? RealAudio servers?? headers
• ??Broadcast.com ?????5 ? RealAudio servers???
  headers
• ?? RealAudio servers??????media????
• ??????
• ?????RealAudio Servers??????????,
• RealAudio ??????????UDP flows ??.

12
????(cont.)

• Jacobus Merwe et al.
• extracted and analyzed 4.5 million application
  level session-level log entries for two streaming
  services
• over a period of 4 months.
• The fields in each log entry include
• requesting IP address,
• particulars of requested resource,
• Real or Windows Media object
• transport protocol
• TCP or UDP
• total data transmitted
• session end-time, total session time,
• status/error codes, etc

13
????(cont.)

• Characterize the workload by looking at a number
  of different measures of on-demand media servers
• Protocol family
• MMS 72, Real 23
• Bandwidth
• low 35, High 65
• Transportation protocol
• UDP 34 , TCP 29, Http 37

14
????(cont.)

• Schulzrinne H. et al.
• Real Time Transportation Protocol
• RTSP streams
• Real Time Streaming Protocol(RTSP)
• Session control
• Remote control streaming options
• play, fast forward, rewind, pause, restart
• RTP/RTCP streams
• Real-Time Transportation Protocol(RTP)
• Accompanying streams
• Media / QoS Packets

15
????(cont.)

• Conlklin G.J. et al.
• Scalable and adaptive streaming delivery
• Vendor strategies
• MMS, Real commercial products
• Client-Processing QoS Evaluation
• Application-Level Multicasting

16
????(cont.)

• client ???QoS??
• Accounting QoS
• Estimated end-to-end variant delay packet loss
• According to the media packet headers
• Feedback RTCP QoS??
• ?????????
• Stop/redirect media streaming

17
????(cont.)

• Application-level multicasting
• Geographically distributed servers
• RTSP Agent??members???? ????(jitter, loss)
• Redirect clients?????????server??????
• ??massive media streaming??????????.

18
????(cont.)

• Our work
• ??streaming media????
• ??WAN router ???media ????
• ??streaming media????,??????
• QuickTime, RealPlayer, MediaPlayer
• ??streaming media WAN ????

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3.Prevalent Application

• TCP Application
• Mail, Telnet, Ftp, WWW
• Streaming Media, P2P file sharing
• UDP Application
• DNS, Tftp
• Streaming Media, Game
• VoIP/ SIP

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TCP Application

• TCP Applications
• Mail
• SMTP(25 port), POP3(110 port)
• Telnet
• Telnet (23 port), ssh (22 port)
• Ftp
• Ftp-data (20 port), ftp (port 21)
• Fast Ftp
• WWW/Proxy
• Httpd (80 port), sHttpd (443 port)
• Proxy (3128 port, 8080 ports)

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(No Transcript)
22
Fast FTP traffic Logs
61.13.173.211.1229gt140.
135.101.74.2090 958575.000 684 1401.425
140.135.101.74.2090gt61.13.173.211.1229
31192.000 764 40.827
61.13.173.211.1230gt140.135.101.74.2095
1025917.000 733 1399.614 140.135.101.74.2104
gt61.13.173.211.1232 120.000 3
40.000 140.135.101.74.21gt61.13.173.211.1193
917.000 10 91.700
140.135.101.74.2095gt61.13.173.211.1230
31380.000 769 40.806
140.135.101.74.2102gt61.13.173.211.1231
3124.000 74 42.216 61.13.173.211.
1231gt140.135.101.74.2102 116249.000 87
1336.195 61.13.173.211.1232gt140.135.101.74.2104
144.000 3 48.000
61.13.173.211.1193gt140.135.101.74.21
225.000 5 45.000
61.13.173.211.1233gt140.135.101.74.2105
866487.000 619 1399.817
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TCP Application (cont.)

• P2P applications
• Napster (6677, 6688 port)
• eDonkey (4661, 4662 port)
• KaZaA (1214 port)
• Streaming Media
• MediaPlayer (1755 port)
• RealPlayer (7070 port)
• QuickTime Player (554 port)
• Others

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UDP Application

• DNS
• server accepts client