@techreport{oai:ipsj.ixsq.nii.ac.jp:00066309,
 author = {茂木, 重憲 and 渡邊, 晶 and Shigenori, Mogi and Akira, Watanabe},
 issue = {7},
 month = {Oct},
 note = {TCP の輻輳制御動作の解析や再送原因の解明には，cwnd や ssthresh の値が必要である．しかしこれらの値は TCP の内部変数で，伝送されるパケットからは入手できない．そこで伝送されるパケットに対して TCP の輻輳制御アルゴリズムと同じ動作を行い，リアルタイムに値を推定する研究を行った．FreeBSD の TCP を対象として，tcpdump に推定機能を実装し，TCP 内部の値と推定値が一致することを確認した．, To analyze the behavior of the TCP congestion contorol, the value of the congestion control parameters, such as cwnd and ssthresh are required. These values could not be obtained from packets because they are not stored in the TCP header but they are maintained in the operating system. We present this method to estimate the TCP congestion contorol parameters in real time. In the method, we apply the TCP congestion control algorithms implemented in FreeBSD 8.0 to each observed packet. We have modified tcpdump to support our estimation method. The result of simple comparision test between estimated values and the values inside the FreeBSD kernel shows our estimation method goes almost well.},
 title = {輻輳制御パラメータのリアルタイム推定の研究},
 year = {2009}
}