2017 29th International Teletraffic Congress (ITC 29) 2017
DOI: 10.23919/itc.2017.8064349
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fling: A Flexible Ping for Middlebox Measurements

Abstract: Middleboxes in private networks have been known to change packets in many ways, making it hard to design protocol extensions that work for the large majority of Internet users. Addressing the need to know what such middleboxes do, we introduce a tool called fling ("flexible ping"). fling can carry out (almost) any kind of protocol dialogue between a server and a client based on a simple specification in a json and a pcap file, and identify what middleboxes do to the packets of the dialogue. This fills a gap in… Show more

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Cited by 6 publications
(5 citation statements)
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“…Except for the SCTP multi-homing tests, for which we ran a specific SCTP test program 1 , the client and the server ran the fling tool. fling [13], which is available from http://fling-frontend.nntb.no, allows to test whether an arbitrary sequence of packets can be exchanged between a client and a server using pre-defined pcap and json files. This makes it easy to exchange sequences of packets that are crafted for a particular measurement purpose.…”
Section: Test Setupmentioning
confidence: 99%
See 1 more Smart Citation
“…Except for the SCTP multi-homing tests, for which we ran a specific SCTP test program 1 , the client and the server ran the fling tool. fling [13], which is available from http://fling-frontend.nntb.no, allows to test whether an arbitrary sequence of packets can be exchanged between a client and a server using pre-defined pcap and json files. This makes it easy to exchange sequences of packets that are crafted for a particular measurement purpose.…”
Section: Test Setupmentioning
confidence: 99%
“…When a test is finished (or failed), paths are probed from both sides, similar to Tracebox [9], and the final client test result is submitted to the server via the HTTPS/TCP signaling channel. A detailed description of fling is given in [13].…”
Section: Bidirectional Internet Testsmentioning
confidence: 99%
“…A performance analysis of WebRTC and session initiation protocol (SIP) [14] for video conferencing was conducted in [15] and it wasfound that WebRTC provided a better call quality compared to SIP under the same network conditions. Other related works on the performance of WebRTC can be found in [17][18][19][20][21][22].…”
Section: Introductionmentioning
confidence: 99%
“…In a previous study [2], we transmitted packets between 225 clients and 52 servers around the world using our flexible ping ("fling") measurement tool 1 [3], in order to see what happens when they carry a non-zero DSCP. Specifically, in addition to DSCP=0, we used three values that are important for WebRTC: CS1 (low-priority data), AF42 (multimedia conferencing) and EF (telephony).…”
Section: Introductionmentioning
confidence: 99%
“…On the other, a DSCP choice is not expected to have any effect whatsoever when the network is uncongested: it is only meant to influence how routers treat packets as they take them from their input queues and schedule them for transmission. However, congesting the Internet at a large scale from many vantage points is not usually a well accepted practice in measurement testbeds (in our case, we used the ARK 2 , PLANETLAB 3 and NORNET CORE 4 platforms). Thus, we are left with a choice of: i) doing smaller-scale measurements, or ii) trying to understand if the DSCP value had an effect even in conditions when the network may not have been congested.…”
Section: Introductionmentioning
confidence: 99%