NS3 Projects

Need for Ns3 projects:

• Ns3 projects was designed to improve scalability, modularity, coding style, and documentation.
• Several C++ design patterns such as smart pointers, templates, callbacks, and copy-on-write are leveraged
• The Internet nodes are designed to be a more faithful representation of real computers, including the support for key interfaces such as sockets and network devices, multiple interfaces per nodes, use of IP addresses, and other similarities.
• Design architecture to support the open-source networking software like routing daemons, kernel protocol and packet trace analyzer
• To reduce the need to port or rewrite models and tools for simulation.

Merits of ns3 projects:

• Wide range of use, both optimization and expansion of the existing networks and also design of the new network can be used
• Particularly applicable for design and optimization of medium and large network
• Ns3 projects is flexible, vivid and visual to use simulator for teaching
• Forecast function of network simulation is unmatched by any other method.
• It has low initial application cost.
• It’s simulation results are reproduced and easily analysis

Have high reliability

Ns3 features:

• It has cross layer features like tracing and packet tags. This means,
• Allow to report events across non-contiguous layers
• Small units of information attached to packets
• Running routing daemons on NS-3
• Run unmodified POSIX programs under simulation
• Packets can be saved to PCAP files, in a real format
• It’s an real time scheduler like simulation events synchronized to “wall clock time”

Run Linux Kernel TCP/IP stack under simulation

Types of routing protocols in ns3 Projects:

• IPV4 AODV (Ad Hoc On Demand Distance Vector)
• Dynamic Source Routing (DSR)
• IPV4 Static Routing (supports both uncast and multicast)
• IPV4 OLSR (Optimized Link State Routing)
• IPv4 DSDV (Destination Sequenced Distance Vector)
• Ipv4NixVectorRouting (a more efficient version of global routing)
• Ipv4ListRouting (used to store a prioritized list of routing protocols)
• Ipv4GlobalRouting (used to store routes computed by the global route manager)
• Ipv6StaticRouting
• Ipv6ListRouting (used to store a prioritized list of routing protocols)