IP Library › Granted Patent US 12,596,568
Granted Patent B2
US 12,596,568 · App. 18/415,160 · Granted Apr 7, 2026

Round trip time (RTT) measurement based upon sequence number

Inventors: Mohammadreza Attar (Cambridge, MA); Navindra Yadav (Cupertino, CA); Abhishek Ranjan Singh (Pleasanton, CA); Vimalkumar Jeyakumar (Los Altos, CA); Shashidhar Gandham (Fremont, CA); Roberto Fernando Spadaro (Milpitas, CA)
Assignee: Cisco Technology, Inc.
G06F9/45558G06F3/0482G06F3/04842G06F3/04847G06F16/122G06F16/137G06F16/162G06F16/17G06F16/173G06F16/174G06F16/1744G06F16/1748G06F16/2322G06F16/235G06F16/2365G06F16/24578G06F16/248G06F16/285G06F16/288G06F16/29G06F16/9535G06F21/53G06F21/552G06F21/556G06F21/566G06N20/00G06N99/00G06T11/206H04J3/0661H04J3/14H04L1/242H04L7/10H04L9/0866H04L9/3239H04L9/3242H04L41/046H04L41/0668H04L41/0803H04L41/0806H04L41/0816H04L41/0893H04L41/0894H04L41/12H04L41/16H04L41/22H04L41/40H04L43/02H04L43/026H04L43/04H04L43/045H04L43/062H04L43/08H04L43/0805H04L43/0811H04L43/0829H04L43/0841H04L43/0858H04L43/0864H04L43/0876H04L43/0882H04L43/0888H04L43/10H04L43/106H04L43/12H04L43/16H04L43/20H04L45/306H04L45/38H04L45/46H04L45/507H04L45/66H04L45/74H04L47/11H04L47/20H04L47/2441H04L47/2483H04L47/28H04L47/31H04L47/32H04L61/5007H04L63/0227H04L63/0263H04L63/06H04L63/0876H04L63/1408H04L63/1416H04L63/1425H04L63/1433H04L63/1441H04L63/145H04L63/1458H04L63/1466H04L63/16H04L63/20H04L67/01H04L67/10H04L67/1001H04L67/12H04L67/51H04L67/75H04L69/16H04L69/22H04W72/54H04W84/18G06F2009/4557G06F2009/45587G06F2009/45591G06F2009/45595G06F2221/033G06F2221/2101G06F2221/2105G06F2221/2111G06F2221/2115G06F2221/2145H04L67/535
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Quick Facts
Patent No.
US 12,596,568
App. No.
18/415,160
Filed
Jan 17, 2024
Granted
Apr 7, 2026
Kind
B2
Examiner
KIM, HARRY H
Art Unit
2411
USPC
370/253
Abstract

Systems, methods, and computer-readable media are provided for determining a packet's round trip time (RTT) in a network. A system can receive information of a packet sent by a component of the network and further determine an expected acknowledgement (ACK) sequence number associated with the packet based upon received information of the packet. The system can receive information of a subsequent packet received by the component and determine an ACK sequence number and a receiving time of the subsequent packet. In response to determining that the ACK sequence number of the subsequent TCP packet matches the expected ACK sequence number, the system can determine a round trip time (RTT) of the packet based upon the received information of the packet and the received information of the subsequent packet.

Claims (65)

1 . A method comprising:

determining, at a network device in a network, an expected acknowledgement (ACK) sequence number associated with a packet;

determining an ACK sequence number of a different packet;

when the ACK sequence number of the different packet does not match the expected ACK sequence number, ignoring the different packet;

determining that an ACK sequence number of another packet; and

when the ACK sequence number of the another packet matches the expected ACK sequence number, determining a round trip time (RTT) of the packet.

2 . The method of claim 1 , further comprising:

generating a warning when the ACK sequence number of the different packet does not match the expected ACK sequence number.

3 . The method of claim 1 , further comprising:

determining an additional expected ACK sequence number associated with an additional packet sent by a device in the network;

determining that an additional ACK sequence number of a different additional packet received by the device matches the additional expected ACK sequence number associated with the additional packet; and

determining a round trip time (RTT) of the additional packet based on first information of the additional packet and second information of the different packet.

4 . The method of claim 3 , further comprising:

receiving third information corresponding to a transmission control protocol (TCP) handshake performed within a specific time period and associated with a TCP connection; and

based on the third information corresponding to the TCP handshake, determining a number of at least one of re-transmission packets and new packets transmitted during the specific time period.

5 . The method of claim 1 , wherein the expected ACK sequence number is determined based on a third ACK sequence number of the packet and a size of the packet.

6 . The method of claim 1 , further comprising:

determining a sending time, a packet sequence number and a packet size of the packet based on packet information sensed by at least one sensor of a plurality of sensors in the network, the packet information corresponding to the packet.

7 . The method of claim 6 , further comprising:

determining a receive time of a subsequent packet received by a device associated with the network; and

determining the round trip time (RTT) of the packet based on the sending time of the packet and the receive time of the subsequent packet.

8 . The method of claim 1 , further comprising:

determine a respective ACK sequence number of a following packet based on first packet information of the following packet; and

in response to a determination that the respective ACK sequence number of the following packet matches a second expected ACK sequence number, determining a round trip time (RTT) of the packet based on second packet information of the packet and the first packet information of the following packet.

9 . The method of claim 1 , further comprising:

determining a congestion level of the network based at least on the round trip time (RTT) of the packet.

10 . The method of claim 1 , further comprising:

determining a number of non-duplicative packets; and

determining a packet loss rate of the network during a time period based at least on the number of non-duplicative packets.

11 . A system comprising:

one or more processor; and

a computer-readable storage medium storing instructions which, when executed by the one or more processor, cause the system to:

determine an expected acknowledgement (ACK) sequence number associated with a packet in a network;

determine an ACK sequence number of a different packet;

when the ACK sequence number of the different packet does not match the expected ACK sequence number, ignore the different packet;

determine that an ACK sequence number of another packet; and

when the ACK sequence number of the another packet matches the expected ACK sequence number, determine a round trip time (RTT) of the packet.

12 . The system of claim 11 , wherein the instructions, when executed by the one or more processor, cause the system to:

select a range of packet sequence numbers;

determine a packet sequence number of the packet based on packet information of the packet; and

determine that the packet sequence number of the packet is within the range of packet sequence numbers.

13 . The system of claim 11 , wherein the instructions, when executed by the one or more processor, cause the system to:

generate a warning when the ACK sequence number of the different packet does not match the expected ACK sequence number.

14 . The system of claim 11 , wherein the instructions, when executed by the one or more processor, cause the system to:

determine an additional expected ACK sequence number associated with an additional packet sent by a component associated with the network;

determine that an additional ACK sequence number of a different additional packet received by the component matches the additional expected ACK sequence number associated with the additional packet; and

determine a round trip time (RTT) of the additional packet based on first information of the additional packet and second information of the different additional packet.

15 . The system of claim 14 , wherein the instructions, when executed by the one or more processor, cause the system to:

receive third information corresponding to a transmission control protocol (TCP) handshake performed within a specific time period and associated with a TCP connection; and

based on the third information corresponding to the TCP handshake, determine a number of at least one of re-transmission packets and new packets transmitted during the specific time period.

16 . The system of claim 11 , wherein the expected ACK sequence number is determined based on an additional ACK sequence number of the packet and a size of the packet.

17 . The system of claim 11 , wherein the instructions, when executed by the one or more processor, cause the system to:

determine a sending time, a packet sequence number and a packet size of the packet based on packet information sensed by at least one sensor of a plurality of sensors in the network, the packet information corresponding to the packet;

determine a receive time of a further packet received by a component associated with the network; and

determine the round trip time (RTT) of the packet based on the sending time of the packet and the receive time of the further packet.

18 . The system of claim 11 , wherein the instructions, when executed by the one or more processor, cause the system to:

determine a number of non-duplicative packets; and

determine a packet loss rate of the network during a time period based at least on the number of non-duplicative packets.

19 . The system of claim 11 , wherein the expected ACK sequence number is determined independent of the different packet.

20 . A non-transitory computer-readable medium having stored thereon instructions which, when executed by one or more processor, cause the one or more processor to:

determine an expected acknowledgement (ACK) sequence number associated with a packet;

determine an ACK sequence number of a different packet;

when the ACK sequence number of the different packet does not match the expected ACK sequence number, ignore the different packet;

determine that an ACK sequence number of another packet; and

when the ACK sequence number of the another packet matches the expected ACK sequence number, determine a round trip time (RTT) of the packet.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 18, 2024
From: ATTAR, MOHAMMADREZA; YADAV, NAVINDRA; SINGH, ABHISHEK RANJAN; JEYAKUMAR, VIMALKUMAR; GANDHAM, SHASHIDHAR; SPADARO, ROBERTO FERNANDO
To: CISCO TECHNOLOGY, INC.
Reel/Frame 066166/0144 →
Continuity (6)
Continuation 18058091 · Nov 22, 2022
Continuation 17238193 · Apr 22, 2021
Continuation 16173400 · Oct 29, 2018
Continuation 15170837 · Jun 1, 2016
Provisional Application 62171899 · Jun 5, 2015
Related Publication 20240163188A1 · May 16, 2024
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