linux配置中eth0和eth1做什么用的？

是光纤以太网接口卡，遵循以太网通信协议进行信号传输，一般来通过光纤线缆与光纤以太网交换机连接。

It is a fibre-optic Ether network interface card, which follows the Ethernet communication protocol for signal transmission and is generally connected to the optic Ether network switch by fibre-optic cable.

eth0和eth1的作用是区分网卡名称，与WINDOWS的本地连接1，本地连接2相同含义。

The role of eth0 and eth1 is to distinguish the name of the net card from the local connection of WINDOWS1 and the local connection2 in the same sense.

子网卡在这里并不是实践上的网络接口筑树，但是能够当作汇集接口在体系中闪现，如eth0:1、eth1:2这种收集接口。

Subnet cards are not tree-building for practical network interfaces here, but they can be flashed into the system as pooled interfaces, such as eth0:1, eth1:2.

扩展资料：

extensions:

Linux操作系统嵌入了TCP/IP协议栈，协议软件具有路由转发功能。路由转发依赖作为路由器的主机中安装多块网卡。

The Linux operating system is embedded in the TCP/IP Barrack, and the protocol software has a route forward function.

当某一块网卡接收到数据包后，系统内核会根据数据包的目的IP地址，查询路由表，然后根据查询结果将数据包发送到另外一块网卡，最后通过此网卡把数据包发送出去。此主机的处理过程就是路由器完成的核心功能。

When a data package is received by a network card, the data package is sent to another network card on the basis of the search results. The host process is the core function performed by the router.

通过修改Linux系统内核参数ip_forward的方式实现路由功能，系统使用sysctl命令配置与显示在/proc/sys目录中的内核参数。

The route function is achieved by modifying the nucleic parameters of the Linux system ip_forward, using the sysctl command configuration and the kernel parameters displayed in the /proc/sys directory.

出于安全考虑，Linux内核默认是禁止数据包路由转发的。在linux系统中，有临时和永久两种方法启用转发功能

For security reasons, Linux kernels are by default prohibited from transferring data packages. In Linux, there are temporary and permanent means to enable forwarding.

参考资料：

References:

百度百科-Linux

使用注意事项

Use watch

子网卡在这里并不是实际上的网络接口设备，但是可以作为网络接口在系统中出现，如eth0:1、eth1:2这种网络接口。它们必须要依赖于物理网卡，虽然可以与物理网卡的网络接口同时在系统中存在并使用不同的IP地址，而且也拥有它们自己的网络接口配置文件。但是当所依赖的物理网卡不启用时（Down状态）这些子网卡也将一同不能工作。

Subnet cards are not actual network interface devices here, but they can appear in the system as network interfaces, such as eth0:1, eth1:2. They have to rely on physical network cards, although they can exist in the system at the same time as the network interfaces of physical network cards and use different IP addresses, and they also have their own network interface configuration files.

如果将一个物理网卡通过vconfig命令添加到多个VLAN当中去的话，就会有多个VLAN虚拟网卡出现，他们的信息以及相关的VLAN信息都是保存在/proc/net/vlan/config这个临时文件中的，而没有独自的配置文件。它们的网络接口名是eth0.1、eth1.2这种名字。

If a physical network card is added to a number of VLANs through the vconfig command, there will be several VLAN virtual network cards whose information, as well as the relevant VLAN information, is stored in a temporary file /proc/net/vlan/config without a separate configuration file. Their network interface names are eth 0.1 and eth1.2.

是一种光纤以太网接口卡，按照以太网通信协议进行信号传输。一般通过光缆与光纤以太网交换机连接。

It is a fibre-optic interface card with the Ethernet communication protocol.

Eth0和eth1用于区分网卡名。它们的含义与windows本地连接1和本地连接2相同。

Eth0 and eth1 are used to distinguish web card names. They have the same meaning as Windows'local connection 1 and local connection 2.

这里的子网卡不是一个实用的网络接口，但是它可以作为一个集合接口在系统中闪现，比如eth0：1，eth1：2。

The subnet card here is not a functional network interface, but it can flash in the system as a pooled interface, such as eth0:1, eth1:2.

扩展资料：

extensions:

Linux操作系统嵌入了TCP／IP协议栈，协议软件具有路由转发功能。路由和转发依赖于在主机中安装多个网卡作为路由器。

Linux operating system is embedded in the TCP/IP protocol counter and the protocol software has a route forwarding function. Routes and forwarding depend on the installation of multiple netcards in the mainframe as routers.

当某一网卡接收到度包时，系统内核会根据度包的目的IP地址查询路由表，然后根据查询结果将度包发送到另一网卡，最后通过该网卡发送度包。主机的进程是路由器的核心功能。

When a network card is received, the system will search based on the IP address of the purpose of the package. The host process is the core function of the router.

路由功能是通过修改Linux内核参数来实现的。sysctl命令用于配置和显示／proc／sys目录中的内核参数。

The route function is performed by modifying the parameters of the Linux kernel. The sysctl command is used to configure and display the kernel parameters in the /proc/sys directory.

出于安全原因，Linux内核默认禁止数据包路由和转发。在Linux系统中，有临时和永久两种方法启用转发功能。

For security reasons, the Linux kernel defaults to ban route and forward. In Linux there are both temporary and permanent methods to enable forwarding.

参考资料来源：百度百科-linux

Source: 100 degrees-linux