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1·Gets the index of the loopback interface.

获取环回接口的索引。

2·To correct the problem, configure a loopback interface.

要更正此问题，配置一个环回接口。

3·Hence, the loopback interface 127.0.0.1, but it could just as easily be running on a remote system.

所以这里使用loopback接口127.0.0.1，但是在远程系统上运行PHP也很容易。

4·The auto-netsh.sh script tunes some kernel networking parameters, configures the loopback interface, and starts up a DHCP client.

auto - netsh . sh脚本调整一些内核联网参数，配置loopback接口，并启动一个DHCP客户机。

5·Whether multicast traffic can be received on the loopback interface, or whether the multicast transmitters are using the same NIC on which the data is being received.

是否多播能在loopback接口上被接收，或者是否多播传送器在接收的数据上使用相同的NIC。

6·The following examples use a couple of flags on the interface to retrieve its current state and check for loopback.

下面的示例使用一对接口标志来检索其当前状态，并检查环回。

7·The -i lo option tells tcpdump what interface to listen on (the loopback device, in this case).

i lo选项告诉tcpdump要侦听哪个接口(在这个例子中要侦听回送设备)。