Is possible in comparison to higher-layer timestamps (as explained Timestamped in hardware as they exit the host, then greater accuracy Must be measured with a high degree of accuracy. In some use cases, such as carrier networks, these two metrics are anĮssential aspect of the Service Level Agreement (SLA) and therefore Measurement is performed using timestamped test packets. The One-Way Active Measurement Protocol and the Two-WayĪctive Measurement Protocol are used for performanceĭelay and delay variation are two of the metrics that OWAMP/TWAMP can RFC 7820 OWAMP and TWAMP Checksum Complement March 2016 1. Checksum Complement in Authenticated Mode. Using the Checksum Complement with or withoutĪuthentication. Interoperability with Existing Implementations. Reception of OWAMP/TWAMP with Checksum Complement. Intermediate Updates of OWAMP/TWAMP withĬhecksum Complement. Transmission of OWAMP/TWAMP with ChecksumĬomplement. OWAMP/TWAMP Test Packets with Checksum Complement. Using the UDP Checksum Complement in OWAMP and TWAMP. The Trust Legal Provisions and are provided without warranty asġ. Include Simplified BSD License text as described in Section 4.e of Code Components extracted from this document must Please review these documentsĬarefully, as they describe your rights and restrictions with respect This document is subject to BCP 78 and the IETF Trust's Legal RFC 7820 OWAMP and TWAMP Checksum Complement March 2016Ĭopyright (c) 2016 IETF Trust and the persons identified as the Information about the current status of this document, any errata,Īnd how to provide feedback on it may be obtained at Internet Standard see Section 2 of RFC 5741. NotĪll documents approved by the IESG are a candidate for any level of Publication by the Internet Engineering Steering Group (IESG). It has received public review and has been approved for It represents the consensus of the IETFĬommunity. This document is a product of the Internet Engineering This document defines an Experimental Protocol for the InternetĬommunity. ![]() Published for examination, experimental implementation, and This document is not an Internet Standards Track specification it is Interoperable with existing OWAMP/TWAMP implementations. The behavior defined in this document is completely Thisĭocument proposes to use the last 2 octets of every test packet as aĬhecksum Complement, allowing timestamping engines to reflect theĬhecksum modification in the last 2 octets rather than in the UDPĬhecksum field. Since these packets are transported over UDP, the UDPĬhecksum field is then updated to reflect this modification. Transmission time into every outgoing OWAMP/TWAMP test packet during Use hardware-based timestamping engines that integrate the accurate Protocols by using timestamped test packets. The One-Way Active Measurement Protocol (OWAMP) and the Two-WayĪctive Measurement Protocol (TWAMP) are used for performance UDP Checksum Complement in the One-Way Active Measurement Protocol (OWAMP) and Two-Way Active Measurement Protocol (TWAMP) Internet Engineering Task Force (IETF) T. TNO accepts no liability for the content of this e-mail, for the manner in which you use it and for damage of any kind resulting from the risks inherent to the electronic transmission of messages.RFC 7820: UDP Checksum Complement in the One-Way Active Measurement Protocol (OWAMP) and Two-Way Active Measurement Protocol (TWAMP) If you are not the addressee or if this message was sent to you by mistake, you are requested to inform the sender and delete the message. This message may contain information that is not intended for you. I don't really see a way to loop over the payload to recalculate the checksum, would anyone perhaps have a code snippet for this ? I checked out the Cillium source(from what I see makes use of the provided tc-helpers: ), but is there an appropriate way to do checksum (re)calculation for UDP with XDP ? Since it does not really like long loops that much and the payload possibly being quite long. I posted this question in the Cillium Slack too, but I figured posting it here might help other people too. ![]()
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