This works exactly the same as TcpProbe [2] except for TcpProbe [3]
To see which parameters are monitored have a look at the source code in net/dccp/probe.c
Links:
[1] http://www.linuxfoundation.org/tags/networking
[2] http://www.linuxfoundation.org/collaborate/workgroups/networking/tcpprobe
[3] http://www.linuxfoundation.org/collaborate/workgroups/networking/dccp