IPQoS has the following features:
Classifier that selects actions, which are based on filters that configure the QoS policy of your organization
Metering module that measures network traffic, in compliance with the Diffserv model
Service differentiation that is based on the ability to mark a packet's IP header with forwarding information
Flow-accounting module that gathers statistics for traffic flows
Statistics gathering for traffic classes, through the UNIX kstat command
Support for SPARC and x86 architecture
Support for IPv4 and IPv6 addressing
Interoperability with IP Security Architecture (IPsec)
Support for 802.1D user-priority markings for virtual local area networks (VLANs)