TCED - TCP Congestion Event Detection Tool

TCED overview

TCED is a graphical tool analysis for TCP connections. TCED allows the identification of TCP Congestion Event for metrology purpose such as TCP protocol behaviour analysis. The philosophy of TCED is somehow different from others existing softwares such as Tstat or TFStat in the way where TCED is not a TCP losses estimation tool. A Congestion Event is defined as a set of losses occurring on a TCP window which involves a TCP congestion adaptation (i.e. a decrease of the current sending window). TCED proposes a method (based on the LEAST (Mark Allman) and Benko-Veres algorithms) able to identify a congestion event at the border of an autonomous system. TCED can also be used to detect retransmissions, losses and congestion events of many flow.

TCED's input

TCED uses the lipcap library (library used in Tcpdump) and is able to detect congestion events both in live modeby sniffing packets over a network and in trace mode by reading Tcpdump readable trace files.

TCED's output

Each packet corresponds to an entry inside a log file. With this entry, we can analyse whether the packey belongs to a retransmission process or a congestion event in order to state on the congestion level of the network.