As part of a broader organisational restructure, data networking research at Swinburne University of Technology has moved from the Centre for Advanced Internet Architecture (CAIA) to the Internet For Things (I4T) Research Lab.

Although CAIA no longer exists, this website reflects CAIA's activities and outputs between March 2002 and February 2017, and is being maintained as a service to the broader data networking research community.

Three Web Cameras, Two-Way Video Transmission

The following graphs represent the traffic characteristics of packets captured when Computer 2 sent and received data to/from Computers 2 and 3. Data sent to Computers 2 and 3 was automatically sent via Yahoo! for efficiency purposes. The ACK replies from Computers 2 and 3 were also sent via Yahoo!. Video data sent from Computers 2 and 3 was, however, sent directly to Computer 1 and in turn, Computer 1 sent all ACKs back to Computers 2 and 3 directly.

Inter-packet Arrival Results


Figure 5.1: Data Packet Flow

Figure 5.2: Data Packet Flow

Figure 5.3: ACK Packet Flow

Figure 5.4: ACK Packet Flow

Figures 5.1 to 5.4 show the inter-arrival times of data packets sent directly from Computer 2 and the corresponding inter-arrival times of ACK packets sent by Computer 1.

Figures 5.1 and 5.2 inducate 68.1% of packets from Computer 2 had an inter-arrival time of less than or equal to 0.25msec. We can see from Figures 5.3 and 5.4 that a portion of the ACK replies from Computer 1 had widely distributed inter-arrival times between 100msec to 200msec. We can also see that 6.7% of ACK packets had an inter-arrival time of less than 0.25msec.


Figure 5.5: Data Packet Flow

Figure 5.6: Data Packet Flow

Figure 5.7: ACK Packet Flow

Figure 5.8: ACK Packet Flow

Figures 5.5 to 5.8 show the inter-arrival times of data packets sent directly from Computer 3 and the corresponding inter-arrival times of ACK packets sent by Computer 1. 66.4% of packets sent from Computer 3 had an inter-arrival time of less than or equal to 0.25msec. In return, only 1.2% of packets from Computer 1 had an inter-arrival time of less than 0.250msec. We can also see that once again, as in Figure 5.3, that a portion of the inter-arrival time of ACK packets was distributed between 100msec and 200msec.


Figure 5.9: Data Packet Flow

Figure 5.10: Data Packet Flow

Figure 5.11: ACK Packet Flow

Figure 5.12: ACK Packet Flow

Figures 5.9 to 5.12 show the packet inter-arrival time characteristics of Computer 1 sending data to Yahoo! and likewise, receiving ACK replies from Computers 2 and 3 via Yahoo!. We can see in Figures 5.9 and 5.10 that 72.3% of packets sent by Computer 1 had an inter-arrival time of less than or equal to 0.25msec. Figures 5.11 and 5.12 indicate that 47.1% of ACK packets had an inter-arrival time of less than 1msec. A small percentage of packets (just under 13%) had an inter-arrival time of between 85msec and 105msec.



Packet Length Results


Figure 5.13: Data Packet Flow

Figure 5.14: Data Packet Flow


Figure 5.15: ACK Packet Flow

Figures 5.13 and 5.1 show that 32.1% of packets sent by Computer 2 were 52bytes long and 36.3% were 1500bytes long. We can also see in Figure 5.15 that Computer 1 replied to Computer 2's data with 46byte ACK packets.


Figure 5.16: Data Packet Flow

Figure 5.17: Data Packet Flow


Figure 5.18: ACK Packet Flow

Figures 5.16 and 5.17 show that 33.2% of packets from Computer 3 were 52bytes long, with 33.8% being 1500bytes long. The 46byte ACK packet sent from Computer 1 can be seen in Figure 5.18.


Figure 5.19: Data Packet Flow

Figure 5.20: Data Packet Flow


Figure 5.21: ACK Packet Flow

In Figures 5.19 and 5.20 we can see that when Computer 1 sent web camera video data to Yahoo!, 27.5% of packets were 52bytes long and 45.6% were 1420bytes long. The computers receiving video data (Computers 2 and 3) replied with 46byte ACK packets.





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