Path MTU Discovery for IP version 6

McCann, John J.; Deering, S.; Mogul, Jeffrey C.

doi:10.17487/rfc1981

Cited by 82 publications

(29 citation statements)

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“…In addition, [16] argues that packet fragmentation can cause poor performance. As a compromise, TCP can use Path MTU Discovery (PMTUD) [22,20] to determine the largest segment that can be transmitted across a given network path without being fragmented. Initially, the data sender transmits a segment with the IP "Don't Fragment" (DF) bit set and whose size is based on the MTU of the local network.…”

Section: Path Mtu Discoverymentioning

confidence: 99%

Measuring interactions between transport protocols and middleboxes

Medina¹,

Allman²,

Floyd³

2004

Proceedings of the 4th ACM SIGCOMM Conference on Internet Measurement

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In this paper we explore the current network environment with respect to how the network's evolution ultimately impacts end-to-end protocols. The traditional end-to-end assumptions about the Internet are increasingly challenged by the introduction of intermediary network elements (middleboxes) that intentionally or unintentionally prevent or alter the behavior of end-to-end communications. This paper provides measurement results showing the impact of the current network environment on a number of traditional and proposed protocol mechanisms (e.g., Path MTU Discovery, Explicit Congestion Notification, etc.). We present results of measurements taken using an active measurement framework to study web servers. We analyze our results to gain further understanding of the differences between the behavior of the Internet in theory versus the behavior we observed through measurements. In addition, these measurements can be used to guide the definition of more realistic Internet modeling scenarios.

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Section: Path Mtu Discoverymentioning

confidence: 99%

Measuring interactions between transport protocols and middleboxes

Medina¹,

Allman²,

Floyd³

2004

Proceedings of the 4th ACM SIGCOMM Conference on Internet Measurement

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“…IP networks may utilize an algorithm called path MTU (Maximum Transmission Unit) discovery, which is used to determine the maximal length of an IP packet that can be sent through a series of lower-layer links without fragmentation [4] [5]. As the maximum supported MTU is a property of a link between two IP nodes, if packets are taking different routes between a source-destination pair, the path MTU discovery algorithm may fail.…”

Section: A Packet-based Traffic Splittingmentioning

confidence: 99%

Traffic splitting algorithms in multipath networks: Is the present practice good enough?

Németh

Rétvári

2012

2012 15th International Telecommunications Network Strategy and Planning Symposium (NETWORKS)

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This paper examines different traffic splitting strategies for multipath IP networks. The question is whether today's widely deployed algorithms perform well in all situations. We have implemented in a simulator and analyzed different wellknown algorithms. Throughout our study several kinds of traffic traces have been used: real ones captured at backbones as well as at access networks, and specially derived, hypothetical traces. Based on the results we argue that the answer to the leading question is fairly negative: there can be several realistic scenarios, where more sophisticated methods seem to be required.

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“…In contrast to IPv4 where fragmentation is performed en-route, in IPv6 fragmentation is end-to-end. In order to avoid intermediate routers having to fragment packets, IPv6 end-hosts are required to perform Path MTU (PMTU) discovery prior to establishing a connection, unless they use the guaranteed minimum MTU of 1280 octets [12]. It is reasonable to assume that backbone network topologies support…”

Section: Maximum Transfer Unit (Mtu) Considerationsmentioning

confidence: 99%

High-speed, in-band performance measurement instrumentation for next generation IP networks

2010

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Abstract. Facilitating always-on instrumentation of Internet traffic for the purposes of performance measurement is crucial in order to enable accountability of resource usage and automated network control, management and optimisation. This has proven infeasible to date due to the lack of native measurement mechanisms that can form an integral part of the network"s main forwarding operation. However, Internet Protocol version 6 (IPv6) specification enables the efficient encoding and processing of optional per-packet information as a native part of the network layer, and this constitutes a strong reason for IPv6 to be adopted as the ubiquitous next generation Internet transport.In this paper we present a very high-speed hardware implementation of in-line measurement, a truly native traffic instrumentation mechanism for the next generation Internet, which facilitates performance measurement of the actual data-carrying traffic at small timescales between two points in the network. This system is designed to operate as part of the routers" fast path and to incur an absolutely minimal impact on the network operation even while instrumenting traffic between the edges of very high capacity links. Our results show that the implementation can be easily accommodated by current FPGA technology, and real Internet traffic traces verify that the overhead incurred by instrumenting every packet over a 10 Gb/s operational backbone link carrying a typical workload is indeed negligible.

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Path MTU Discovery for IP version 6

Cited by 82 publications

References 0 publications

Measuring interactions between transport protocols and middleboxes

Measuring interactions between transport protocols and middleboxes

Traffic splitting algorithms in multipath networks: Is the present practice good enough?

High-speed, in-band performance measurement instrumentation for next generation IP networks

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