US Robotics USR2410 Manual de usuario descargar pdf (Pagina 39)

Packets that were received from the wireless device were classified as mesh data, linkstat data or

other packets. If a packet did not originate from another mesh router, it would not have been

encapsulated with the proper grid header. It would then have followed the unclassified edge, and

be sent directly to the host router. This was useful when debugging the origin of communication

problems between two routers. If a packet generated from a system that was not part of the mesh

network reached the router, there was a problem with the Input Processing and Packet

Classification section.

The router configuration had the ability to determine statistical information about generated

“linkstat” packets. This feature, however, was not used, since this project is concerned with end-

to-end communication through the mesh. Any other packets, marked as mesh packets, go on to

the grid_demux classifier.

These packets were classified as either route advertisements or data. The route advertisement

packets were forwarded to the DSDVRouteTable element. The IP header of the data packets were

checked for integrity by the CheckIPHeader element, and then the packet was classified

according to its destination IP address.

If they were addressed to the current router, the grid header was stripped, and the packets were

sent to the Rewriter block if it existed. The Rewriter block does not exist in packet forwarding

routers, instead packets are sent to the Router Output Processing block.

If the packets were destined for another router in the mesh network, they were sent to the Mesh

device Output Processing block.

If the packets were destined for another network, they were sent on one of the two following

paths, depending on the configuration. If the router was a Packet Forwarding or Client Gateway

router, the packet was sent to a GridGatewayInfo element. The packets were then sent to the

Mesh Wireless Device Output Processing block. If the router was an Internet Gateway router the

packets had reached the gateway, and they were sent to the rewriter elements.

5.3.4.3.

Mesh Wireless Device Output Processing

Some processing must be done to packets before they were routed through the mesh network

using the DSDV protocol. The elements that were implemented to do this are shown in Figure

5-6. Note that colored elements have been duplicated for clarity only.

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US Robotics USR2410 Manual de usuario Pagina 39