Oneway Active Measurement Protocol SpeakerYingshun Date 20061023 1

Outline n Introduction n OWAMP-control n OWAMP-Test 2

What is OWAMP n Ping - IP layer ＊ packet switch - packet loss

Relationship of Test and Control Protocols n OWAMP-control used to initiate, start, and stop

Logical Model Session Sender OWAMP Test Session Receiver returning the results Server OWAMP-Control-Client OWAMP-Control

Played by the same host OWAMP-Control-Client Fetch-Client Session-Sender Server Session-Receiver OWAMP-Test 6

Connection setup TCP connection Port 861 Greeting message Set-up-Response Server-Start message Client Server 7

Greeting message TCP C port 861 S ＊＊＊ establish a connection to the server

Set-up-Response C S ＊＊＊ tells the server which shared secret the client wishes to

commands are available for client n Request-Session - to each Request-session message，an OWAMP server

Creating Test session Request-session message Accept-session message Send schedules Start-session message Client Start-Ack message

OWAMP-Test n Sender Behavior - Packet Timings - Packet format - UDP 19

OWAMP-Test (cont. ) n Receiver Behavior 20

Reference n RFC 4656 n http: //e 2 epi. internet 2. edu/owamp/ - (one

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One-way Active Measurement Protocol Speaker：Ying-shun Date： 2006/10/23 1

Outline n Introduction n OWAMP-control n OWAMP-Test 2

What is OWAMP n Ping - IP layer ＊ packet switch - packet loss - round-trip delay n OWAMP - One Way Active Measurement Protocol - control with TCP - runs over UDP 3

Relationship of Test and Control Protocols n OWAMP-control used to initiate, start, and stop test sessions and to fetch their results. n OWAMP-Test used to exchange test packets between two measurement nodes. 4

Logical Model Session Sender OWAMP Test Session Receiver returning the results Server OWAMP-Control-Client OWAMP-Control Fetch-Client 5

Played by the same host OWAMP-Control-Client Fetch-Client Session-Sender Server Session-Receiver OWAMP-Test 6

Connection setup TCP connection Port 861 Greeting message Set-up-Response Server-Start message Client Server 7

Greeting message TCP C port 861 S ＊＊＊ establish a connection to the server 8

Set-up-Response C S ＊＊＊ tells the server which shared secret the client wishes to used 16 octets challenge authenticated 16 octets encryption (AES) 32 octets authentication (HMAC) (Initialization Vector) needs to be unique Set-Up-Response message 9

Server-Start message C S 10

commands are available for client n Request-Session - to each Request-session message，an OWAMP server MUST respond with an Accept-session message n Start-Sessions n Stop-Sessions - is available to both the client and the server n Fetch-Session 11

Creating Test session Request-session message Accept-session message Send schedules Start-session message Client Start-Ack message Server Stop session 12

Request-session message (1/3) 13

Request-session message (2/3) 14

Request-session message (3/3) 15

Accept-session message 16

Start-session message 17

Start-Ack message 18

OWAMP-Test n Sender Behavior - Packet Timings - Packet format - UDP 19

OWAMP-Test (cont. ) n Receiver Behavior 20

Stop session (1/2) 21

Stop session (2/2) 22

Reference n RFC 4656 n http: //e 2 epi. internet 2. edu/owamp/ - (one way ping) 23