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I tried to check if sctp sender actually drops
messages if the message expires based on timetolive. I
modified the network conditions using dummynet and
configured a pipe with 0.95 percent loss rate (in
direction from sender to receiver).
I tried to observe sent packets using tcpdump on
sender side. I see that the same message/packet is
being retransmitted again and again even after 20
seconds while the 'timetolive' parameter for all
messages is only 4 seconds and I dont see any FWD TSN
packets in the process.
I have enclosed the code fragement I use for fixing
timetolive parameter and sending messages.

for (i=0; i>-1; i++)
{
sleep(1); // one message per second
*((int*)buf+4) = i; // buf is the message to
send.
// value 'i' acts as index to

// message
msg->msg_iov->iov_base = buf;
msg->msg_iov->iov_len=200; //size of message =200
msg->msg_flags=MSG_XPG4_2;
*((int*)(msg->msg_iov->iov_base))=i;
sri->sinfo_timetolive = 4; // setting ttl to 4ms
if (ext_sendmsg(*((int*)fd), msg, 0) < 0)
{
perror("sendmsg");
exit(1);
}
}

Am i doing anything wrong?
Any help in this regard will be greatly appreciated.

Thanks
Manoj.



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• [SCTP-Discussion] sinfo_timetolive parameter not working, Manoj Kumar Ampalam, 05/12/2005

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