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。

youdao

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。

youdao

This machine has recently been rebooted (hence the low uptime and packet statistics).

该计算机最近已重新启动过(因而具有很低的正常运行时间和数据包统计数据)。

youdao

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