Modeling and performance evaluation of SCTP as transport protocol for firewall control

Authors:
Sebastian Kiesel;Michael Scharf
Affiliations:
Institute of Communication Networks and Computer Engineering, University of Stuttgart, Germany;Institute of Communication Networks and Computer Engineering, University of Stuttgart, Germany
Venue:
NETWORKING'06 Proceedings of the 5th international IFIP-TC6 conference on Networking Technologies, Services, and Protocols; Performance of Computer and Communication Networks; Mobile and Wireless Communications Systems
Year:
2006

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Modeling and performance evaluation of transport protocols for firewall control

Computer Networks: The International Journal of Computer and Telecommunications Networking

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Abstract

Firewalls are a crucial building block for securing IP networks. The usage of out-of-band-signaling protocols (such as SIP) for VoIP and multimedia applications requires a dynamic control of these firewalls, which can be implemented using the Simple Middlebox Configuration Protocol (SIMCO). In this paper, we study the performance of SCTP and TCP as transport protocols for the transaction-based signaling protocol SIMCO, which requires small end-to-end delays. We present an analytical model in order to quantify the impact of head-of-line blocking in SCTP. Both, the model and measurements reveal that SCTP can significantly reduce the SIMCO response times by leveraging transmission over multiple parallel streams. While a few SCTP streams can almost completely avoid head-of-line blocking, our measurements show that TCP may suffer from rather large end-to-end delays.