Wireshark download for windows 7 64 bit2/16/2023 ![]() ![]() Each router on the network is then configured to differentiate traffic based on its class. Rather than differentiating network traffic based on the requirements of an individual flow, DiffServ operates on the principle of traffic classification, placing each data packet into one of a limited number of traffic classes. Different PHBs may be defined to offer, for example, low-loss or low-latency service. DiffServ-aware routers implement per-hop behaviors (PHBs), which define the packet-forwarding properties associated with a class of traffic. DiffServ relies on a mechanism to classify and mark packets as belonging to a specific class. In contrast, IntServ is a fine-grained, flow-based mechanism. ![]() Today, DiffServ has largely supplanted TOS and other layer-3 QoS mechanisms, such as integrated services (IntServ), as the primary architecture routers use to provide QoS.ĭiffServ is a coarse-grained, class-based mechanism for traffic management. ![]() In the DS field, a range of eight values (class selectors) is used for backward compatibility with the former IP precedence field. In December 1998, the IETF published RFC 2474 - Definition of the Differentiated services field (DS field) in the IPv4 and IPv6 headers, which replaced the IPv4 TOS and IP precedence fields with the DS field. Many of the proposed QoS mechanisms that allowed these services to co-exist were both complex and failed to scale to meet the demands of the public Internet. Modern data networks carry many different types of services, including voice, video, streaming music, web pages and email.
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