US Robotics USR2410 Bedienungsanleitung PDF herunterladen (Seite 42)

5.3.4.6.

Gateway Device Input Processing and Packet

Classification

Packets that originated from a client, or the Internet, would have arrived at this block. The ARP

protocol was used to match an IP address to a MAC address on the client network. The Internet

gateway configuration did not implement this protocol. The elements included in this block can

be seen in Figure 5-9.

Figure 5-9: Directed Graph of Gateway Device Input Processing and Packet Classification

Block

The Classifier first classified all packets. If they corresponded to an ARP request, they were sent

to an ARPResponder.

If the incoming packet was an ARP reply packet, it was sent to the first input of the intern_arpq

ARPQuerier element. In the Internet Gateway Configuration these packets were discarded. Data

packets were sent on for further processing. If a packet could not be classified as either an ARP

packet or a data packet, it was discarded.

The data packets had their Ethernet headers stripped, then had the integrity of their IP header

checked. In the Internet Gateway Configuration, the packets were then passed to the

extern_for_me classifier. This was used to discard all packets that were not addressed to the host

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US Robotics USR2410 Bedienungsanleitung Seite 42