Jacobson, V. (1997). pathchar -- A Tool to Infer Characteristics of Internet Paths. http://www.msri.org/sched/empennage/jacobson.html. Home/Search Document Not in Database Summary Related Articles Check |
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....can assess. For instance, it could be the round trip time between them on the Internet, measured using ping, or the number of hops on the path between them. Alternatively, it could be some measure of the cost of this path, such as the available bandwidth, which could be measured using pathchar [10] or packetpair [2] HiScamp dynamically builds a hierarchy of clusters of nodes based on D### ##, using Scamp at each level in the hierarchy. We illustrate the protocol using a 2 level hierarchy for simplicity. Each node maintains two partial views, organized hierarchically. The first, called ....
V. Jacobson. Pathchar -- a tool to infer characteristics of internet paths. April 1997.
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....of network internal link delays using the Timestamp mechanism of the ICMP protocol [24] Our earlier measurements [3] show that ICMP Timestamp is widely supported on network routers . In the past, some concern has been raised about techniques that rely on router based ICMP measurements [17,20], that routers may sometimes delay processing of ICMP messages, a practice that may introduce errors. Such concerns have recently been examined by Govindan and Paxson [13] and con rmed in our own measurements [4] These measurements indicate that the delay distributions of ICMP packets rarely ....
....We have developed solutions to these speci c problems, but this highlights the degree of care that must be exercised when designing, implementing, and debugging these algorithms. 2.3 Direct measurement We describe the direct method used for our measurement. Other direct approaches exist (c.f. [17,12]) but were found unsuitable, as one way delays cannot be isolated from round trip measurements, and the possible interaction with asymmetric routing [22] is not well understood . We can directly estimate the delay on link l = hx; yi as follows. Let s 2 N denote our measurement source, and t x ....
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V. Jacobson. pathchar - A tool to infer characteristics of Internet paths. available from ftp://ftp.ee.lbl.gov/pathchar, April 1997.
Direct Measurement Vs. Indirect Inference For Determining .. - Anagnostakis, Greenwald (2002) (Correct)
....of network internal link delays using the Timestamp mechanism of the ICMP protocol [24] Our earlier measurements [3] show that ICMP Timestamp is widely supported on network routers. In the past, some concern has been raised about techniques that rely on router based ICMP measurements [17,20], that routers may sometimes delay processing of ICMP messages, a practice that may introduce errors. Such concerns have recently been examined by Govindan and Paxson [13] and confirmed in our own measurements [4] These measurements indicate that the delay distributions of ICMP packets rarely ....
....to a local maximizer; the initial distribution must therefore be chosen carefully for the method to yield accurate estimates, and not converge to a local, but not global, maximum. 2.3. Direct measurement We describe the direct method used for our measurement. Other direct approaches exist (cf. [12,17]) but were found unsuitable, as one way delays cannot be isolated from round trip measurements, and the possible interaction with asymmetric routing [22] is not well understood. We can directly estimate the delay on link l =#x,y# as follows. Let s N denote our measurement source, and x ....
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