Dynamic network services are network capabilities assigned or configured for a user or application at runtime, or in response to identity, policy, demand, or available resources. In the Network Access Server (NAS) model, the term means user-specific services granted after authentication and governed by policy. It is not a single universal definition for every networking architecture.
What does “dynamic network services” mean?
RFC 2881, an IETF informational RFC published in July 2000, says: “The core of what a NAS provides, are dynamic network services.” In that document, a Network Access Server provides services to users based on authentication, with usage accounted for and policy potentially limiting consumption according to bandwidth availability or service agreements. RFC 2881, section 3
In plain terms, a network can grant a person or application a particular set of services or resources when access is requested, rather than relying only on one fixed configuration for everyone. The exact meaning depends on context: the RFC’s definition concerns user-facing access services at a NAS, while other networking discussions use “dynamic” for programmable forwarding or software-deployed network functions.
How dynamic services work in a NAS
- A user or endpoint requests access. The NAS acts as a controlled network access point.
- The NAS authenticates the user. Authentication establishes the identity on which service decisions can be based.
- Authorization and provider policy determine what to grant. Policy may account for service agreements and available bandwidth.
- The NAS provides the permitted services or resources. The assignment may be specific to the user and current network conditions.
- The system accounts for resource use. Consumption records can support network management, planning, and billing.
A NAS is not merely a router. It may perform routing, but its defining role in this model is controlled service delivery based on user identity and provider policy. Policy can be implemented through a configuration file, graphical interface, API, or protocol such as RADIUS, Diameter, or COPS. RFC 2881
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Examples of dynamic network services
RFC 2881 describes a range of possible services and allocations, including:
- IP address and route assignment
- Quality-of-service treatment and bandwidth management
- Tunnels and encryption
- Network names and name-server information
- Telephone network resources
These examples are not a required bundle. A provider can authorize a different combination of resources or service treatment according to its policy and the network’s state. RFC 2881
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Dynamic provisioning is not necessarily continuous or automatic
“Dynamic” describes a mode in which a service or resource can be assigned in response to identity, policy, demand, or resource conditions. RFC 2881 also permits static configuration. The term alone does not mean that every setting changes continuously, that provisioning is instantaneous, or that a network adapts without an administrator-defined policy.
How the term differs across NAS, SDN, and NFV
| Context | What is provisioned | Typical trigger or control point | How it relates to the term |
|---|---|---|---|
| NAS service provisioning | User-facing services and resources, such as addresses, QoS, tunnels, or name-server information | User identity and authentication, provider policy, and network state; controlled at the NAS | This is the specific meaning described in RFC 2881. |
| Software-defined networking (SDN) | Forwarding behavior or flow rules | An SDN controller provisions flows proactively or decides forwarding behavior in response to incoming traffic and programs network devices | A related form of programmable network control, not a synonym for per-user NAS service provisioning. RFC 8455 |
| Network functions virtualization (NFV) | Software-based network functions and end-to-end services | Deployment and operation of virtual network functions, including flexible assignment to hardware | An approach to building adaptable services, not itself the NAS definition. ETSI GS NFV 001 V1.1.1 |
The distinctions matter when reading technical documentation: a user receiving a policy-based service at a NAS, a controller changing forwarding rules, and an orchestrator deploying a virtual network function all involve adaptable networking, but describe different things.
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Accounting is different from auditing
In the NAS model, accounting records resource consumption. That information can help operators manage capacity, plan services, or bill for use. Auditing instead concerns the nature of user activity. RFC 2881 treats them as separate functions, so usage accounting should not be described as a record of everything a user did. RFC 2881
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Because no single definition applies across all network architectures, technical documentation should identify what is changing and what controls it. Specify whether the subject is a user’s service at a NAS, forwarding behavior managed by an SDN controller, or software network functions deployed through NFV. That context makes “dynamic” informative rather than ambiguous.
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