Anybody with a packet sniffer on your network or on a remote machine can view the information as it is exchanged, sometimes even password information.

任何人都可以在您的网络或远程计算机上使用包嗅探器查看交换的信息，有时甚至可以查看密码信息。

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Authentication at the packet level allows users to be sure that the packet received came from a particular machine, and that its contents were not altered somewhere along the way.

包级别的认证让用户可以确保收到的包来自于特定的机器，并且它的内容在传输路径上没有被改变。

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In the example packet from Listing 3, 192.168.1.104 happens to be the IP address of the machine running Snort, and 192.168.1.1 is the router that machine's network USES to get to the outside world.

在清单3的示例包中，192.168.1.104正是运行Snort的机器的IP地址，而192.168.1.1则是该机器的网络通往外部网络的路由器的地址。

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Rules govern how many hamburger patties to a pound of beef (10), how long to toast a bun (17 seconds) and how much sanitizer to use when cleaning the shake machine (1 packet for 2.5 gallons of water).

FORBES: You Want Data With That?

The new protocol also offers enhanced security, by providing a cryptographic means of checking that a particular packet really does come from the machine it claims to.

ECONOMIST: Internet protocol