These are initialized at start of day in a function called inet_init in linux/net/ipv4/af_inet.c (as TCP and UDP are part of the inet family of protocols).
它们都是在linux/net/ipv4/af_inet.c 文件中一个名为 inet_init的函数中进行初始化的（因为TCP和UDP 都是inet 簇协议的一部分）。
什么是IPv4地址？
What happens when IPv4 addresses run out?
IPv4地址耗尽会发生什么？
The IPV4 can only provide 4 billion IP addresses.
IPV 4只能提供40亿个IP地址。
IPv4 addresses are a finite and nearly depleted resource.
IPv4地址是几乎耗尽的有限资源。
Mixed IPv4 and IPv6 communications are supported in a dual mode cell.
双模式单元中支持混合的IPv4和IPv 6通信。
IPSec is an integral part of IPv6 while IPv4 support for IPSec is optional.
IPSec是IPv 6不可或缺的部分，而对IPSec的IPv 4支持是可选的。
Given IPv4's dwindling address pool, that obviously wouldn't be a good thing.
由于IPv4的地址池日渐枯竭，这显然不是什么好事情。
IPsec is an optional security component of IPv4, but in IPv6 it is mandatory.
IPSec是IPv4的一个可选的安全组成部分，但在IPv 6是强制性的。
IPv4 uses 32-bit addresses and can support approximately 4.3 billion devices.
IPv4协议用的是32位编码的地址，可以支持大约43亿个装置或设备（的地址）。
Like IPv4, it is subject to attacks when vulnerabilities are successfully exploited.
与IPv 4类似，在漏洞被成功利用时，会受到攻击。
The current addressing system—called IPv4—has about four billion possible addresses.
现在的寻址系统称为IPv4，它拥有40亿个有效地址。
The futuristic applications are now enabled for dual stack support for both IPv4 and IPv6.
现在，未来的应用程序可以支持IPv4和IPv6双协议栈。
In any case, IPv4 and IPv6 are expected to coexist on the Internet for many years to come.
不管怎样，预计IPv4和IPv 6会在今后许多年内共存。
The net effect of all this is that there's less than 4 billion IPv4 addresses to go around.
所有这一切导致的后果就是可分配的IPv4地址不足40亿。
The IPv4 and IPv6 protocols refer to the way in which web addresses are created and assigned.
IPv4和IPv6都是有关互联网地址产生和分配的协议。
Due to IPv4's limited number of useable global addresses, IPv6 is expected to gradually replace IPv4.
由于IPv4在可用全局地址数量上的限制，IPv6有望逐渐取代IPv4。
IPv4 will continue to be supported on all platforms in DB2 9 and will remain as the default protocol.
所有平台上的DB 2Viper中仍将继续支持IPv4，并以它作为缺省协议。
If you specify a host name, you need not worry about whether your system is configured for IPv4 or IPv6.
如果指定主机名称，则不需要担心系统是为IPv4还是为IPv 6配置的。
The Internet is running out of addresses using the current version of the Internet Protocol, known as IPv4.
当前正在使用的互联网协议IPv4即将耗尽IP地址资源。
Today's Internet was built largely on the IPv4 or Internet Protocol version four, first introduced in 1980.
Curt Hopkins / 2010年5月19日 3:49 PM今天的互联网主要是基于IPv4，或者叫互联网协议版本4（Internet Protocol version four）建成的，于1980年首次被引入。
This month (February 2011), IANA announced that it has allocated the last batch of remaining IPv4 addresses.
本月(2011年2月)，IANA宣布它已经分配掉最后一批剩余的IPv4地址。
IPv4 uses 32-bit addresses, which limits the address space to 4, 294, 967, 296 (232) possible unique addresses.
IPv4使用32位地址，理论上最多可提供4,294,967,296 (232)个地址。
IPv6 is also much more sophisticated than IPv4, with many new features (including built-in security mechanisms).
IPv 6还要比IPv 4复杂得多，有许多新特性(包括内置的安全机制)。
An example of a logical interface is a tunnel interface that is used to send IPv6 packets across an IPv4 network.
逻辑接口的一个示例是用于通过IPv 4网络发送IPv 6数据包的隧道接口。
To make things easier for humans, the Domain name Service (DNS) translates familiar names into such IPv4 addresses.
为了简化人们的使用，域名服务(Domain Name Service,DNS)将常见的名称转换成了IPv4地址。
IPv6 is expected to slowly replace IPv4, with the two protocol systems expected to run simultaneously for many years.
IPv 6预计将缓慢替代IPv4，这两种协议系统将共存很多年。
IPv6 was designed to solve the problem of IPv4 address exhaustion, as well as adding a number of additional features.
设计IPv 6是为了解决IPv 4耗尽的问题，并增加大量额外的功能。
Major service providers and websites are ready for IPv6, but some experience response times lower than when using IPv4.
较多服务提供商和网站已经为IPv 6做好了准备，但是他们中的一些遇到了响应时间比使用IPv 4时要慢的问题。
These work by not being publicly routable, but the router itself still needs an IPv4 address in order to operate at all.
这些虽然不是公共地址，但路由本身仍旧需要使用IPv4地址以正常运作。
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