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can, however, define its own class loaders Sun Microsystems provides three template class loader modules as part of the JDK (discussed earlier) If an untrusted applet could somehow install a Class Loader, the applet would be free to define its own namespace Prior to Java 2, this would allow an attack applet to breach security (see 5) If you are writing an application or built-in extension that defines its own Class Loader, you should be very careful to follow the rules; otherwise, your Class Loader will almost certainly introduce a security hole It is unfortunate that in order to get the ability to use your own code-finding mechanism, you must also take on responsibility for managing namespaces One criticism often raised against the Java security model is that because of the presence of objects like application-definable class loaders, the security model is too distributed and lacks central control.

Three different types of networks are normally found in a failover configuration: the heartbeats, the production or service network, and the administration network. For more detail on networks, please see 9, Networking. One caveat that applies to all of these network types: Some operating systems support virtual network interfaces, where more than one IP address can be placed on the same NIC. While these virtual IPs can be used in some failover scenarios, beware of introducing a single point of failure. For example, will the failure of a single NIC bring down both heartbeat networks

file:///D|/Downloads/Livros/computa o/Computer%20Net-Down%20Approach%20Featuring%20the%20Internet/arphtm (3 of 8)20/11/2004 15:52:36

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The heartbeat networks are the medium over which the systems in a failover pair communicate with each other. Fundamentally, the systems exchange Hi, how are you and I m fine, and you messages over the heartbeat links. In reality, of course, the heartbeat packets are much more complex, containing state information about each server and commands from one server directing the other to change states or execute some other function.

Figure 54-2: Each node on a LAN has an IP address, and each node's adapter has a LAN address So we see that ARP resolves an IP address to a LAN address In many ways it is analogous to DNS (studied in section 25), which resolves hostnames to IP addresses However, one important difference between the two resolvers is that DNS resolves hostnames for hosts anywhere in the Internet, whereas ARP only resolves IP addresses for nodes on the same LAN If a node in California were to try to use ARP to resolve the IP address for a node in Mississippi, ARP would return with an error Now that we have explained what ARP does, let's look at how it works The ARP module in each node has a table in its RAM called an ARP table This table contains the mappings of IP addresses to LAN addresses Figure 54-3 shows what an ARP table in node 222222222220 might look like For each address mapping the table also contains a time-to-live (TTL) entry, which indicates when the entry will be deleted Note that the table does not necessarily contain an entry for every node on the LAN; some nodes may have had entries that expired over time, whereas other nodes may have never been entered into the table We note that a typical expiration time for an entry is 20 minutes from when an entry is placed in an ARP table

Applet Class Loaders install each applet in a separate namespace This means that each applet sees its own classes and all of the classes in the standard Java library API, but it doesn't see classes belonging to other applets Hiding applets from each other in this way has two advantages: It allows multiple applets to define classes with the same name without ill effect, so applet writers don't have to worry about name collisions It also makes it harder, though not impossible, for applets to team up As an example, consider a class called laptop with no explicit package name (that is, laptop belongs to the default package) Imagine that the laptop class is loaded by an Applet Class Loader from wwwrstcorpcom as you surf the Java Security Web Site Then you surf over to javasun.

Heartbeat networks can be implemented over any reliable network link Most often, simple 100Base-T Ethernet is the medium of choice for heartbeats, since it is inexpensive and pervasive and it does not require any specialized hardware or cabling Using a faster or more complicated network medium for your heartbeats will add absolutely no value to your cluster, so why spend the money Besides, these other media can be less reliable than good ol 100Base-T Fast networks are ideal when sending large streams of data, but heartbeat messages are short and relatively infrequent (on a network traffic time scale) The primary purpose of heartbeats in a cluster is so that one server learns of the demise of one of its partners when the heartbeats stop However, heartbeats can stop for several reasons besides a downed partner server.

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