Concurrent multipath transfer using SCTP multihoming: introducing the potentially-failed destination state

Authors:
Preethi Natarajan;Nasif Ekiz;Paul D. Amer;Janardhan R. Iyengar;Randall Stewart
Affiliations:
Protocol Engineering Lab, CIS Dept., University of Delaware;Protocol Engineering Lab, CIS Dept., University of Delaware;Protocol Engineering Lab, CIS Dept., University of Delaware;Dept. of Math & Computer Science, Connecticut College;Internet Technologies Division, Cisco Systems
Venue:
NETWORKING'08 Proceedings of the 7th international IFIP-TC6 networking conference on AdHoc and sensor networks, wireless networks, next generation internet
Year:
2008

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Abstract

Previously, we identified the failure-induced receive buffer (rbuf) blocking problem in Concurrent Multipath Transfer using SCTP multihoming (CMT), and proposed CMT with a Potentially-failed destination state (CMTPF) to alleviate rbuf blocking. In this paper, we complete our evaluation of CMT vs. CMT-PF. Using ns-2 simulations we show that CMT-PF performs on par or better than CMT during more aggressive failure detection thresholds than recommended by RFC4960. We also examine whether the modified sender behavior in CMT-PF degrades performance during non-failure scenarios. Our evaluations consider: (i) realistic loss model with symmetric and asymmetric path loss, (ii) varying path RTTs. We find that CMT-PF performs as well as CMT during non-failure scenarios, and interestingly, outperforms CMT when the paths experience asymmetric rbuf blocking conditions. We recommend that CMT be replaced by CMT-PF in future CMT implementations and RFCs.