Are you using Wireshark to monitor and fear that you will have to open two Wiresharks to monitor a single SCTP association?
If so, you can simply observe in promiscuous mode and apply sctp as a filter or port 2905 (or the port on which the SCTP association is running). However, Promiscuous mode requires root (or admin) privileges.
If you don't have Promiscuous mode, then, as Jason suggested, you will need to control the entire IP address, which is part of the association. Of course, you can combine all the individual pcap files into one, and then analyze the association traffic.
Of course, if it has nothing to do with Wireshark, then all this is gibberish :)
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