Method and apparatus to determine the amount of delay in the transfer of data associated with a TCP zero window event or set of TCP zero window events
First Claim
Patent Images
1. A method of monitoring network zero window events via an interface connection to a network for observing traffic, comprising:
- determining a zero window event advertised by a receiver;
determining whether a sender withheld data transmission until the end of the zero window event;
determining whether the zero window event caused said data transmission to be withheld; and
reporting a duration of a zero window delay only when it is determined the sender withheld said data transmission until the end of the zero window event.
4 Assignments
0 Petitions
Accused Products
Abstract
Network monitoring method and apparatus determines the zero window event data transfer delay, reporting the amount of data transfer delay caused thereby. Non-data-transfer-delaying zero window events can be separated from those causing actual delay, allowing reporting of actual delay events separate from non-delay causing events.
-
Citations
8 Claims
-
1. A method of monitoring network zero window events via an interface connection to a network for observing traffic, comprising:
-
determining a zero window event advertised by a receiver; determining whether a sender withheld data transmission until the end of the zero window event; determining whether the zero window event caused said data transmission to be withheld; and reporting a duration of a zero window delay only when it is determined the sender withheld said data transmission until the end of the zero window event. - View Dependent Claims (2, 3, 4)
-
-
5. A network test instrument for determining zero window delay, comprising:
- a network interface for observing network traffic; and
a processor, said processor including employing observed network traffic to; determine a start time of a zero window event advertisement from a receiver; determine an end time of the zero window event; determine whether a sender withheld data transmission until the end of the zero window event; determine whether the zero window event caused said data transmission to be withheld; and report a duration of a zero window delay only when it is determined the sender withheld said data transmission until the end of the zero window event. - View Dependent Claims (6)
- a network interface for observing network traffic; and
-
7. A system for determining zero window delay, comprising:
-
a network monitor for observing network traffic at a first location on a network; and a processor at a second location on the network different from said first location, said processor including employing observed network traffic to; determine a start time of a zero window event advertisement from a receiver, determine an end time of the zero window event; determine whether a sender withheld data transmission until the end of the zero window event; determine whether the zero window event caused said data transmission to be withheld; and report a duration of a zero window delay only when it is determined the sender withheld said data transmission until the end of the zero window event. - View Dependent Claims (8)
-
Specification