Date: Mon, 23 Mar 2009 18:20:21 +0800 From: Andrew Chen <b93502044@ntu.edu.tw> To: freebsd-net@freebsd.org Subject: Problems in using SCTP CMT Message-ID: <20090323182021.ysrn0ogu84cg084g@wmail1.cc.ntu.edu.tw>
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Hi, We have some problems when we tried to send data using CMT-SCTP. Actually, we are not sure if we do enable CMT functionalities. We set up two PCs with FreeBSD-7.0. Each PC has two NICs and two IPs. One is public and the other is private. We wrote simple FTP server and client programs. On both sides, local addresses are bound as INADDR_ANY. According to http://tools.ietf.org/html/draft-ietf-tsvwg-sctpsocket-14#section-4.1.5 , if we bind INADDR_ANY and then call connect(), the multi-homing capability of SCTP is automatically enabled. Further, we also turn on sysctl states by setting sysctl net.inet.sctp.cmt_pf=1 sysctl net.inet.sctp.cmt_use_dac=1 sysctl net.inet.sctp.cmt_on_off=1 Then we start transmission and capture the traffics. Unfortunately, the captured packet shows data were transmitted on primary path and there were only heartbeat/HB ACKs on the other path. To our knowledge, to use CMT, the only things we have to do is to establish a multihomed association, and turn on the sysctl options. Can anyone point out something we did wrong or steps we missed? Thanks in advance.
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