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Figure 54-4: Two LANs interconnected by a router There are several interesting things to note about Figure 54-4 First, there are two types of nodes: hosts and routers Each host has exactly one IP address and one adapter But, as discussed in Section 44, a router has an IP address for each of its interfaces Each router interface also has its own ARP module (in the router) and its own adapter Because the router in Figure 54-4 has two interfaces, it has two IP addresses, two ARP modules and two adapters Of course, each adapter in the network has its own LAN address Also note that all of the interfaces connected to LAN 1 have addresses of the form 111111111xxx and all of the interfaces connected to LAN 2 have the form 222222222xxx Thus, in this example, the first three bytes of the IP address specifies the "network" whereas the last byte specifies the specific interface on a network Now suppose that host 111111111111 wants to send an IP datagram to host 222222222222 The sending host passes the datagram to its adapter, as usual But the sending host must also indicate to its adapter an appropriate destination LAN address What LAN address should the adapter use One might venture to guess that the appropriate LAN address is the address of the adapter for host 222222222222, namely, 49-BD-D2-C7-58-2A This guess is, however, wrong If the sending adapter were to use that LAN address, then none of the adapters on LAN 1 would bother to pass the IP datagram up to its network layer; the datagram would just die and go to datagram heaven If we look carefully at Figure 54-4, we see that in order for a datagram to go from 111111111111 to a node on LAN 2, the datagram must first be sent to the router interface 111111111110 Thus, the appropriate LAN address for the frame is the address of the adapter for router interface 111111111110, namely, E6-E9-00-17-BB-4B How does the sending host acquire the LAN address of 111111111110 By using ARP, of course! Once the sending adapter has this LAN address, it creates a frame and sends.

Some people find our closing worry about copper and electricity a bit facetious, but it has a real dark side as well. Large magnets and moving wires can cause copper to induct electricity when you move a magnetic field around, you can create an unexpected electrical charge in an electrical conductor like copper wiring. Not everyone keeps large magnets around, unless they happen to be near a large motor, such as one used to power an elevator. One customer complained of intermittent failures that seemed to occur late in the afternoon nearly every weekday, especially on Friday. After traces of power, network, system, and disk cabling, eventually the root cause was found to be electromagnetic noise inducted into various poorly shielded cables by an elevator that ran in a shaft outside one wall of the machine room. (And you thought we forgot everything from freshman physics.) Hal

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Since all applets from a particular source are put in the same namespace, they can reference each other's methods. A source is defined as a particular directory on a particular Web server. According to the Java specification, every Class Loader must keep an inventory of all the classes it has previously loaded. When a class that has already been loaded is requested again, the class loader must return the already loaded class.

file:///D|/Downloads/Livros/computa o/Computer%20Net-Down%20Approach%20Featuring%20the%20Internet/arphtm (6 of 8)20/11/2004 15:52:36

Of course, the ultimate protection against one of these false positive conditions is human intervention. When heartbeats fail and an alert goes off, a knowledgeable human being can attempt to log in to the servers, evaluate their conditions, and decide what action to take. This is not always a pleasant option, as failures can occur at all hours of the day or night, any day of the week. The human intervention may also introduce delays that are unacceptable in a critical production environment. It may not be practical (or desirable) to wake up your system administrator at 4:00 A.M. Sunday morning, nor to chain him to the table with the system console on it 24 hours a day, so that he can log in to a server and check its condition. It is also impractical to pay SAs to sit at the console 24 hours a day. So we settle for an automated solution.

the frame into LAN 1 The router adapter on LAN 1 sees that the data link frame is addressed to it, and therefore passes the frame to the network layer of the router Hooray, the IP datagram has successfully been moved from source host to the router! But we are not done We still have to move the datagram from the router to the destination! The router now has to determine the correct interface on which the datagram is to be forwarded As discussed in Section 44, this is done by consulting a routing table in the router The routing table tells the router that the datagram is to be forwarded router interface 222222222220 This interface then passes the datagram to its adapter, which encapsulates the datagram in a new frame and sends the frame into LAN 2 This time, the destination LAN address of the frame is indeed the LAN address of the ultimate destination And how does the router obtain this destination LAN address From ARP, of course! ARP for Ethernet is defined in [RFC 826] A nice introduction to ARP is given in the TCP/IP tutorial, [RFC 1180] We shall explore ARP in more detail in the homework problems

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