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SONATA - SCTP Over NAT Adaptation
Overview
Network Address Translation (NAT) is typically used to share a single Internet
address amongst a number of users. Extending the common approach used in NAT
implementations for TCP and UDP to the SCTP protocol is not viable - the SCTP
protocol specification would require checksums for the whole packet (not just
the header) to be re-calculated for each packet - particularly for small home
router implementations. Further, SCTP also offers multi-homing which offers
new challenges for the NAT code to track in a single SCTP connection.
This project entails developing a NAT implementation to support SCTP to be
released for the FreeBSD 7 platform. Our release code will utilise an existing
NAT framework such as ipfw or ipf such that it can be practically deployed on
real systems. The NAT will track SCTP connections via the Verification Tag
(VTag) field and retain connection details should one end of a multi-homed
session change end-points.
The project will also test this implementation under a number of different
usage and failure-mode scenarios, the results of these tests will be published
and can be used to promote the use of SCTP in-the-wild.
Project Goals
- Development and release of a BSD licensed NAT implementation to support
SCTP on the FreeBSD 7 platform
- Development of a test plan to test both the functionality and the
performance of the implementation
- Analysis of system implementation
Program Members
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