Hello, In my application I have tried to set the SACK timer to 400 Milli second by writing following code. struct sctp_assoc_value sack_timer ; bzero(&sack_timer, sizeof(sack_timer)); sack_timer.assoc_id =1 ; sack_timer.assoc_value = 400 ; int res = setsockopt(socketFD, IPPROTO_SCTP, SCTP_DELAYED_ACK_TIME, &sack_timer,sizeof(struct sctp_assoc_value )); But setsockopt() returns error ("Protocol not available"). The kernel version i have used is : 2.6.9-55.EL lksctp version: 1.0.8 Please let me know how can i set SCTP_DELAYED_ACK_TIME value in my application. Br, Padmalochan -- To unsubscribe from this list: send the line "unsubscribe linux-sctp" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html