Hi Daniel, When I run sctp_status test and set max_stream >= 10, the client will fail with "sendmsg: Invalid argument". Would you like to help have a look at this? # ./sctp_status -H 127.0.0.1 -P 9998 -h 127.0.0.1 -p 9999 -s -d 2 -M 20 remote:addr=127.0.0.1, port=distinct, family=2 local:addr=127.0.0.1, port=distinct32, family=2 Starting tests... socket(SOCK_STREAM, IPPROTO_SCTP) -> sk=3 bind(sk=3, [a:127.0.0.1,p:distinct32]) -- attempt 1/10 connect(sk=3) Client: Sending packets.(1/10) sendmsg(sk=3, assoc=0) 17768 bytes. SNDRCV(stream=1 flags=0x1 ppid=846930886) sendmsg(sk=3, assoc=0) 6250 bytes. SNDRCV(stream=2 flags=0x1 ppid=1714636915) sendmsg(sk=3, assoc=0) 23634 bytes. SNDRCV(stream=3 flags=0x1 ppid=424238335) sendmsg(sk=3, assoc=0) 5195 bytes. SNDRCV(stream=4 flags=0x1 ppid=1649760492) sendmsg(sk=3, assoc=0) 7978 bytes. SNDRCV(stream=5 flags=0x1 ppid=1189641421) sendmsg(sk=3, assoc=0) 22715 bytes. SNDRCV(stream=6 flags=0x1 ppid=1350490027) sendmsg(sk=3, assoc=0) 16883 bytes. SNDRCV(stream=7 flags=0x1 ppid=1102520059) sendmsg(sk=3, assoc=0) 10724 bytes. SNDRCV(stream=8 flags=0x1 ppid=1967513926) sendmsg(sk=3, assoc=0) 125 bytes. SNDRCV(stream=9 flags=0x1 ppid=1540383426) sendmsg(sk=3, assoc=0) 2133 bytes. SNDRCV(stream=10 flags=0x1 ppid=1303455736) *** sendmsg: Invalid argument *** Thanks Hangbin Liu -- 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