它能输出非常详细的数据包信息，并且它们应该进行更紧密的观察。
The output from this is quite detailed for each packet and deserves some closer investigation.
通过snoop的输出，我们必须从原始网络数据包信息中提取每一个数据块。
As with the output from snoop, we have to extract each of the blocks of data from the raw network packet information.
本系统有四个主要功能：数据包的捕获、数据包解析、数据包信息分析和数据包信息的显示。
The system has four main functions: capture the network packets, analysis the packet, analysis the information of packet and display packet information.
之后，点击Reload按钮，新立得会自动下载Universe仓库里最新版本的软件包信息。
After that, click the Reload button and Synaptic will download the latest package information from the Universe.
根据问题的性质，有时候最好运行tcpdump一段时间，同时使用- w选项把数据包信息捕捉到文件中。
Depending on the nature of the problem, it is sometimes good practice to run a tcpdump for a period of time while capturing packet information to a file using the -w switch.
您可以获得原始数据包信息，并找出正使用正确的设置进行传输的信息(例如，哪些用户正从哪些主机上登录到某台特定的邮件服务器)。
You can get the raw packet information and find out what information is being transferred with the right Settings (for example, which users are logging in to a particular mail server from which host).
我们收到来自那一地区的紧急求援信息，他们急需食物包。
We've received an SOS from the area asking for food parcels.
该网络使用TCP/IP 协议发送离散的数据包来传输信息。
The internet sends information as discrete packets of data using a suite ofprotocols known as TCP/IP.
您的方案可能丢失了关于应用于特定记录类型依赖包的信息。
Your schema might be missing the information that a dependent package has been applied to a specific record type.
值得注意的是，此时您可以将集成脚本包的信息锁定到模式中。
It is worth noting that at this point you could lock the information for the integration script package into the pattern.
接下来，将信息包的头信息与它所传递到的链中的每条规则进行比较，看它是否与某条规则完全匹配。
Next the packet's header information is compared with each rule in the chain it is passed on to, unless it perfectly matches a rule.
您也会得到关于分片和数据包顺序的信息。
You will also get information about the fragmentation and packet sequence.
当信息包到达时，根据每个信息包中包含的类型、源地址、目的地址和端口信息来过滤它们。
As packets arrive, they are filtered by their type, source address, destination address, and port information contained in each packet.
这些信息包有头，即在每个包前面所附带的一些数据位，它们包含有关信息包的源、目的地和协议类型的信息。
These packets have headers, i.e. bits of data prefixed to every packet that contain information about the packet's source, destination, and protocol types.
这意味着，将丢弃所有与input链中任何规则都不匹配的信息包。
That means all the packets not matching any rule in the INPUT chain will be dropped.
如果信息包与某条规则匹配，那么内核就对该信息包执行由该规则的目标指定的操作。
If a packet matches a rule, the kernel performs the action specified by the target of that rule on the packet.
根据规则所处理的信息包的类型，可以将规则分组在链中。
The rules are grouped in chains, according to the types of packets they deal with.
这种方法使数据能被分成许多信息包，然后使用不同路径将这些信息包发送到其想要的目的地。
This method enables the data to be divided into a number of packets and to be sent to its intended destination using different paths.
以下各节包含有关可用软件包格式的安装信息。
The following sections contain information about installation for the package formats available.
最后，如果信息包与链中的任何规则都不匹配，那么内核将参考该链的策略来决定如何处理该信息包。
Finally, if the packet doesn't match to any rule in the chain, then the kernel consults the policy of that chain to decide what to do with the packet.
以RX和TX开头的行很重要，它们提供关于发送和接收的数据包的信息。
The important rows are those beginning RX and TX, which show information about the packets sent and received.
网络流量由IP信息包(或，简称信息包)—以流的形式从源系统传输到目的地系统的一些小块数据—组成。
Network traffic is made up of IP packets or simply packets — small chunks of data traveling in streams from a source system to a destination system.
处理正在转发的信息包的规则被添加到forward链中。
And rules dealing with packets being forwarded are added to the forward chain.
处理入站信息包的规则被添加到input链中。
Rules dealing with incoming packets are added to the INPUT chain.
处理出站信息包的规则被添加到OUT put链中。
Rules dealing with outgoing packets are added to the OUTPUT chain.
如果某个信息包与规则匹配，那么使用目标ACCEPT允许该信息包通过。
If a packet matches a rule, the packet can be allowed to pass through using target ACCEPT.
对于可对信息包执行的其它操作，还有许多其它目标。
There are many more targets available for other actions that can be performed on packets.
表是包含仅处理特定类型信息包的规则和链的信息包过滤表。
A table is a packet filtering table that contains rules and chains dealing with specific kinds of packets only.
DROP：当信息包与具有DROP目标的规则完全匹配时，会阻塞该信息包，并且不对它做进一步处理。
DROP: a packet that matches a rule perfectly that has a DROP target will be blocked and no further processing will be done on it.
清单3显示了所捕获的、有关每个数据包的信息，包括数据包的大小和IP地址信息。
Listing 3 shows the captured information about each packet, including packet size and IP address information.
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