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network simulator 3.1

In transport mode, the stations can become servers by listening to TCP/UDP ports. The client stations send their requests through the network.

A server can answer the requests it receives from its client stations.

Thanks to the nat/pat translation (IP masquerade) managed by the routers, the requests are able to cross the Internet network. The particular case of the ICMP requests is also managed. The redirection (mapping) authorizes the publication of local servers which are not directly connected to the Internet.

Each router has a filtering table, whose data are input by the user. The filtering routers, the translation and the redirection allow for the creation of a DMZ on a local area network.

A station listens to a TCP port

Sending of a TCP request on port 80

A station listens to a TCP port Sending of a TCP request on port 80

An ID ICMP is generated when the ping is sent

The listened ports are taken into account at the time of reception

An ID ICMP is generated when the ping is sent The listened ports are taken into account at the time of reception

Each station manages its ongoing exchanges

Each station manages its ongoing exchanges

Sending of an answer, selection of the request

Sending of an answer, selection of the request

Nat/pat translation, the requests move across the Internet

Nat/pat translation, the requests move across the Internet

The routers can sometimes filter the requests

The routers can sometimes filter the requests

The mapping (redirection) can be used to publish local servers

The mapping (redirection) can be used to publish local servers

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