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In the preceding chapters, the name of each example class was taken from the same name space This means that a unique name had to be used for each class to avoid name collisions After a while, without some way to manage the name space, you could run out of convenient, descriptive names for individual classes You also need some way to be assured that the name you choose for a class will be reasonably unique and not collide with class names chosen by other programmers (Imagine a small group of programmers fighting over who gets to use the name Foobar as a class name Or, imagine the entire Internet community arguing over who first named a class Espresso ) Thankfully, Java provides a mechanism for partitioning the class name space into more manageable chunks This mechanism is the package The package is both a naming and a visibility control mechanism You can define classes inside a package that are not accessible by code outside that package You can also define class members that are only exposed to other members of the same package This allows your classes to have intimate knowledge of each other, but not expose that knowledge to the rest of the world

icmp A built-in value for all indicates that all IP packets will match If the protocol is not defined in /etc/protocols, you can use the protocol number here For example, 47 represents gre The exclamation mark (!) negates the check Thus, specifying -p ! tcp means all packets that are not TCP If this option is not provided, Netfilter will assume all The --protocol option is an alias for this option An example of its usage is

Part I:

Native methods seem to offer great promise, because they enable you to gain access to an existing base of library routines, and they offer the possibility of faster run-time execution But native methods also introduce two significant problems:

These rules will accept all packets destined to TCP port 80 on the INPUT chain s [!] address [/mask] This option specifies the source IP address to check against When combined with an optional netmask, the source IP can be compared against an entire netblock As with -p, the use of the exclamation mark (!) inverts the meaning of the rule Thus, specifying -s ! 1013172 means all packets not from 1013172 Note that the address and netmask can be abbreviated An example of its usage is

Potential security risk Because a native method executes actual machine code, it can gain access to any part of the host system That is, native code is not confined to the Java execution environment This could allow a virus infection, for example For this reason, applets cannot use native methods Also, the loading of DLLs can be restricted, and their loading is subject to the approval of the security manager Loss of portability Because the native code is contained in a DLL, it must be present on the machine that is executing the Java program Further, because each native method is CPU- and operating system ependent, each DLL is inherently d nonportable Thus, a Java application that uses native methods will be able to run only on a machine for which a compatible DLL has been installed

The use of native methods should be restricted, because they render your Java programs nonportable and pose significant security risks

This rule will drop all packets from the 1721600/16 network This is the same network as 1721600/25525500 To use ip6tables to drop all packets from the IPv6 network range 2001:DB8::/32, we would use a rule like: