Hi, I have a sctp client and an echo server that use one to many mode. The client sends some amount of messages with different stream ids. After that it reads them back from the server with sctp_recvmsg. The server reads one message at a time and sends it back with the same stream id. When I test this on a local host then everything works perfectly - all messages are sent, read and the assoc id is the same every time. If I have the client and the server on different hosts then there are the following problems. sctp_recvmsg sometimes returns the same message twice - these messages have the same assoc id, stream i, ssn. Looks like it can happen only with the first received message. MSG_EOR is true every time. Tcpdump doesn't show any duplicates. The second problem is that assoc id changes very often if i send messages with just a couple seconds delay. I think the same hosts should have the same assoc id more or less. Both hosts have linux kernel 6.5.0-35. Igor.
