FreeBSD kernel IPv4 code
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Alias_sctp is part of the SONATA (http://caia.swin.edu.au/urp/sonata) project to develop and release a BSD licensed implementation of a Network Address Translation (NAT) module that supports the Stream Control Transmission Protocol (SCTP).
Traditional address and port number look ups are inadequate for SCTP's operation due to both processing requirements and issues with multi-homing. Alias_sctp integrates with FreeBSD's ipfw/libalias NAT system.
Version 0.2 features include: