METHODS AND APPARATUS TO DETERMINE NETWORK DELAY WITH LOCATION INDEPENDENCE

摘要

The techniques disclosed herein determine a location independent network delay via a network monitoring device. Such techniques particularly include determining various delays such as a zero window delay, an advertised window delay, and a congestion window delay (including slow start delays).

主权项

1. A method for monitoring network a zero window delay in a communication network comprising:
monitoring, via a network monitoring device, an exchange of data between at least a first network device and a second network device; determining, via the network monitoring device, the first network device received data in excess of its capacity thereby causing its transmission control protocol (TCP) window to reduce to zero; marking, via the network monitoring device, a zero window delay start time once the first network device receives data in excess of its capacity; determining, via the network monitoring device, that the TCP window size for the first network device increases from zero; marking, via the network monitoring device, a zero window delay end time once the TCP window size of the first network device increases from zero; and determining a difference between the zero window delay end time and the zero window delay start time to yield a total zero window delay.