NETWORK END-TO-END LINK PERFORMANCE ANALYSIS USING INTERNET2 DIAGNOSTIC TESTER

摘要

We have conducted the end-to-end network link performance diagnoses and control for Internet2 applications using Network Diagnostic tool (NDT). Internet Transport Protocol TCP uses congestion window to determine how many packets can be sent at one time. Congestion window depends on operating system's TCP buffer size which is very low by default. We can dynamically reset the required buffer size when connected on the Internet2 using web1OO-gutil tool. NDT can also detect the slowest link in the network transmission. We conducted several tests at Bradley network to identify such links. The results can be used to remove or alleviate the transmission bottlenecks in the network communications. Duplex mismatch is another problem which causes poor network speed at receiving end. We tested and found a few duplex mismatches in our test cases where host sets at half duplex and switch sets at full duplex. This problem has to be solved in order to get high speed on Internet2 applications.