H Andrew,
what you describe is correct. Are there actually multiple addresses
changed within the INIT/INIT-ACK chunk? If yes, you have done everything
correctly.
The interesting thing: I also noticed that there are CMT problems on
FreeBSD 8.0 Current.
Randall Stewart and myself have started debugging the problem
yesterday... We'll send you a notice, once we have found the problem
and fixed it.
Best regards
Michael
On Mar 23, 2009, at 3:20 AM, Andrew Chen wrote:
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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