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.
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