Macha Monitoring

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Rural wireless networks in developing regions often depend on slow satellite links for their Internet access. This paper will try to quanitify the traffic patterns and usage of a slow satellite internet link in a rural wireless network and compare this to recent studies of Internet uisage patterns in the developed world to understand key challenges. This will be used as a starting point for further work to try and optimize Internet usage over slow satellite links in developing regions.

Team Members

  • David Johnson
  • Elizabeth Belding
  • Kevin Almeroth
  • Gertjan van Stam

Idea description

Main challenges


Primary obstacles


Metrics that will be measured

  • Percentage of local traffic
  • Caching efficiency (ratio of incoming traffic to external destination to outgoing traffic to external destination)
  • DNS hit rate
  • DNS delays (can be quite significant) , % of DNS hit on local DNS
  • Up/Down Traffic usage over a 2 week loggin interval
  • Flow analysis
- TCP connection durations
- Number of simultaneous flows in the network over time
- Plot of bandwidth used per IP source address in the network - check if there are clear dominant users
- # Retransmissions
- TCP round trip times for ACKS
  • Breakdown of application classes using port numbers
- Peer-to-peer traffic
- Web
- video streaming ... protocols like RTSP have there own port - also IP based for flash sites like youtube
- VoIP ... prototocols like SIP and some known Skype ports - Skype is a challenge if using port 80
- Instant messaging ... could catch things like IRC but maybe IP addresses based again
- tunneling

Useful links

Scraping tcpdump files