US Robotics USR2410 Manual de usuario descargar pdf (Pagina 37)

5.3.4.1.

Rewriter Packet Flow

The rewriter elements preformed the packet classification for the packets input into the gateway

routers. For a description of how the rewriter elements were configured, please see Section 5.1.

The simplified digraph of the elements used to do this can be seen in Figure 5-4.

Figure 5-4: Directed Graph Showing the Rewriter Block

In the network implemented, packets passed through the IPRewriter twice. The first pass

redirected packets if a reverse mapping existed. Theses packets follow the to_world or to_server

edges, depending on the mapping matched. Packets not redirected were classified by destination,

and packets destined for the host router were sent to the Router Output Processing block. The

remaining packets went back to the IPRewriter, this time to perform NAT. The packets were then

sent to the Output Processing block for either the Mesh Wireless Device, or Gateway Device. For

example, a TCP packet arriving from the mesh wireless device and destined for the host router

would have arrived to the IPRewriter at input 3. If a previous mapping existed, it would be sent to

output 1 of the rewriter, otherwise it would be passed to output 2. There it would be forwarded to

the Router Output Processing block.

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US Robotics USR2410 Manual de usuario Pagina 37