Control of Multipath TCP and Optimization of Multipath Routing in the Internet

Authors:
Damon Wischik;Mark Handley;Costin Raiciu
Affiliations:
Computer Science department, UCL, London, UK WC1E 6BT;Computer Science department, UCL, London, UK WC1E 6BT;Computer Science department, UCL, London, UK WC1E 6BT
Venue:
NET-COOP '09 Proceedings of the 3rd Euro-NF Conference on Network Control and Optimization
Year:
2009

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Abstract

There are moves in the Internet architecture community to add multipath capabilities to TCP, so that end-systems will be able to shift their traffic away from congested parts of the network. We study two problems relating to the design of multipath TCP. (i) We investigate stochastic packet-level behaviour of some proposed multipath congestion control algorithms, and find that they do not behave how we might expect from fluid modeling: they tend to flap randomly between their available paths. We explain why, and propose a congestion control algorithm that does not flap. (ii) We consider how the path choice offered by the network affects the ability of end-systems to shift their traffic between a pool of resources. We define a `resource poolability' metric, which measures for each resource how easy it is for traffic to be shifted away from that resource e.g. in the event of a traffic surge or link failure.