US Robotics USR2410 Manual de usuario descargar pdf (Pagina 43)

router. Since packets had not gone to a rewriter element at this point, even packets destined for

the mesh network would be addressed to the host router. This was not done for the Client

Gateway Configuration, since packets would be addressed to a different router, or to a system on

an external network.

Packets were then classified by the type of packet using an IPClassifier element. This was done in

order to send them to the proper rewriter element in the Rewriter block.

5.3.4.7.

Gateway Device Output Processing

This section describes the processing done to packets before they were sent out to the client

systems or the Internet. The included elements of this block can be seen in Figure 5-10.

Figure 5-10: Directed Graph of Gateway Device Output Processing

If an ARP request was received on the gateway device, an ARP response was created using the

ARPResponder element. The response was addressed to the request sender, and contained the

MAC address for the gateway device of the host router. This response was then sent to the

gateway device.

Packets arriving at the ip_to_intern element had their destination IP address annotation set and

had their IP header integrity checked.

In the Client Gateway Configuration, they were sent to the intern_arpq ARPQuerier element.

When the MAC address corresponding to the IP address of the destination was discovered, the

packet would be sent to the gateway device.

The Internet Gateway configuration did not use the ARP protocol, since packets were sent to an

external router in order to access the Internet. The MAC address of this external router had to be

coded in the configuration file prior to setting up the mesh, it was not dynamically discovered.

Packets were sent to an EtherEncap element, where they were encapsulated in an Ethernet Header

containing the MAC address of the external gateway router. They were then sent to the gateway

device.

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US Robotics USR2410 Manual de usuario Pagina 43