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Now suppose that node 222222222220 wants to send a datagram that is IP-addressed to another node on that LAN As we indicated above, the sending node needs to obtain the LAN address of the destination node, given the IP address of that node This task is easy if the destination node has an entry in the sending node's ARP table But what if the destination node does not currently have an entry in the ARP table In particular, suppose node 222222222220 wants to send a datagram to node 222222222222 In this case, the sending node uses the ARP protocol to resolve the address First, the sending node constructs a special packet called an ARP packet An ARP packet has several fields, including the sending and receiving IP and LAN addresses Both ARP query and response packets have the same format The purpose of the ARP query packet to is to query all the other nodes on the LAN to determine the LAN address corresponding to the IP address that is being resolved Returning to the example, node 222222222220 passes an ARP query packet to the adapter along with an indication that the adapter should send the packet to the LAN broadcast address, namely, FF-FF-FFFF-FF-FF The adapter encapsulates the ARP packet in a data link frame, uses the broadcast address for the frame's destination address, and transmits the frame into the LAN Recalling our social security number / postal address analogy, note that an ARP query is equivalent to a person shouting out in a crowded room of cubicles in some company (say, AnyCorp): "What is the social security number of the person whose postal address is cubicle 13, Room 112, AnyCorp, Palo Alto CA " The frame containing the ARP query is received by all the other adapters on the LAN, and (because of the broadcast address) each adapter passes the ARP packet within the frame up to its parent node Each node that receives the ARP packet checks to see if its IP address matches the destination IP address in the ARP packet The one node with a match sends back to the querying node a response ARP packet with the desired mapping The querying node (222222222220) can then update its ARP table and send its IP datagram There are a couple of interesting things to note about the ARP protocol First, the query ARP message is sent within a broadcast frame whereas the response ARP message is sent within a standard frame Before reading on you should think about why this is so Second, ARP is plug-and-play, that is, a node's ARP table gets built automatically -- it doesn't have to be configured by a systems administrator And if a node is disconnected from the LAN, its entry is eventually deleted from the table Sending a Datagram to a Node Off the LAN It should now be clear how ARP operates when a node wants to send a datagram to another node on the same LAN But now let's look at the more complicated situation when a node on a LAN wants to send a network-layer datagram to a node off the LAN Let us discuss this issue in the context of Figure 54-4, which shows a simple network consisting of two LANs interconnected by a router.

That means it is important for the VM to keep package membership straight As a result, Class Loaders have to keep track of packages as well as classes When a class is imported from the network, the Applet Class Loader places it into a namespace labeled with information about its origin Whenever one class tries to reference another, the Applet Class Loader follows a particular order of search The first place it looks for a class is in the set of classes loaded by the Primordial Class Loader If the Primordial Class Loader doesn't have a class with the indicated name, the Applet Class Loader widens the search to include the namespace of the class making the reference Because the Applet Class Loader searches for built-in classes first, it prevents imported classes from pretending to be built-in classes (something known as "class name spoofing").

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Again, minimizing the latency on the heartbeat network helps, as it gives ends more time to receive and process the heartbeat before it starts wondering what happened to its partner A good FMS might be able to monitor not just the existence of heartbeat packets, but of the frequency of the packets If odds senses that ends is slowing down, perhaps it can become a little more tolerant of longer durations between packets for a short period of time Assuming that the operating system provides the functionality, a good FMS product will place itself on the real-time scheduling queue and offer an option to not be on it too..

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This policy prevents such things as applets redefining file I/O classes to gain unrestricted access to the file system Clearly, the point is to protect fundamental primitives from outside corruption..

Low-level system problem takes all networks offline. If a server, wine, cannot see any of its networks, it is not serving any useful function at all. A good FMS package should shut wine down immediately, since, after all, should wine decide to access its shared disks after roses has accepted a failover from it (because wine has no network, it cannot learn of the failover), data corruption is almost certain to result. Another option when a still-operational clustered system suddenly loses all network connectivity is for heartbeats to be routed across shared disks. We have not found a commercial failover product that adequately handles shared disk heartbeats, especially in larger clusters, so we don t consider that a viable solution. Copper no longer conducts electricity. If this occurs, you have bigger problems. Like electricity. Like the laws of physics.

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