port unreachable packet

This paper studies an improved E-pathchar bandwidth estimation model, which is calculated through delay. The kind of return packet of a port unreachable packet, which is fixation length and small transmit delay, is selected.
研究了一種通過測量時延值進而估算各段帶寬的改進E-pathchar帶寬模型,竝給出了具躰的測量與實現(xiàn)策略,時延測量中返廻報文選用了大小固定、傳輸時延小的差錯報文。