Network simulator : ethernet simulations

Simulations

A simulation consists in the emission of a frame by a network interface. You can launch the simulation using the pop-up menu of the transmitting interface. A frame can be emitted in broadcast or unicast (in case of unicast, it is necessary to indicate the recipient MAC address by clicking on the concerned interface). In "real frame" mode, it is possible to emit two (and only two) concurrent frames.

The toolbar is made up of three buttons:

The first one indicates which nodes of the network must be "traced", i.e. which components will post "mini-demonstrations" during the simulations.
The second one (Pause) is used to stop, and then start again a simulation in "real frame" mode.
The third one (Bis/Stop) is used to replay the last simulation (Bis) or to stop a simulation in progress (Stop).

Four types of simulation are available:

Automatic: each traced component posts a "mini-demonstration" to illustrate its operation; each "mini-demonstration" will unfold automatically.
Step by step: idem, but the "mini-demonstrations" will not unfold automatically, it is the user who makes them progress (the "Enter" key can be used as a short cut).
Manual: the user himself or herself indicates the actions carried out by each component.
Real frame: this operating mode describes the collision phenomenon, as well as the difference between the two types of switch.

According to the type of simulation which as been chosen, four options are available:

Full duplex ("real frame" mode only): if this option is activated, the network interfaces and the switches manage both full duplex and auto detection.
Slow motion (automatic, or real frame): it slows down the simulation.
Receiving message: the recipient stations of a frame post a reception message (which is de-activated if two frames are emitted).
Transmit Demo (real frame mode only): the connection points that emit a frame display their activity during their emission.

During a simulation, the content of the frame is displayed. A balloon help is available on each of its elements.

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network simulator

Simulations

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Simulations