Linux network server configuration Basics

Linux network server configuration basics-Linux Enterprise Application-Linux server application information. The following is a detailed description. To create a Secure Linux server, you must first understand the meaning of the configuration files related to network services in the Linux environment and how to configure security. In Linux, the TCP/IP network is configured through several text files. You may need to edit these files to complete networking, however, most of these configuration files can be implemented through the configuration command linuxconf (the network configuration can be implemented through the netconf command. The following describes the basic TCP/IP network configuration file.

*/Etc/conf. modules File

This configuration file defines the parameter information of various modules that need to be loaded at startup. This article focuses on the NIC configuration. When using Linux as a gateway, a Linux server must have at least two NICs. To reduce possible problems during startup, the Linux kernel does not automatically detect multiple NICs. If you need to install multiple NICs for a system that does not compile the NIC driver into the kernel but is loaded dynamically as a module, configure the NIC in the "conf. modules" file.

If the device driver is compiled into a module (kernel module): for PCI devices, the module automatically detects all devices installed on the system. For ISA cards, you need to provide the IO address to the module so that the module knows where to find the card. The information is in "/etc/conf. modules.

For example, we have two ISA bus 3c509 cards. One IO address is 0x300, and the other is 0x320. Edit the "conf. modules" file as follows:

Alias eth0 3c509
Alias eth1 3c509
Options 3c509 io = 0x320, 0 x

This indicates that drivers of 3c509 should be loaded with the eth0 or eth1 names (alias eth0, eth1) respectively, and they should be loaded with the io = 0x300 and 0x320 parameters, to notify the driver where to find the network card, of which 0x is indispensable.

For the PCI card, you only need the alias command to associate ethN with the appropriate driver module name. The IO address of the PCI Card will be automatically detected. For the PCI Card, edit the "conf. modules" file as follows:

Alias eth0 3c905
Alias eth1 3c905

If the driver has been compiled into the kernel, the PCI detection program at system startup will automatically find all related NICs. The ISA card can also be automatically detected. However, in some cases, the ISA card still needs to be configured as follows:

Add the configuration information in "/etc/lilo. conf" by passing the startup parameter information to the kernel through the LILO program. For the ISA card, edit the "lilo. conf" file and add the following content:

Append = "ether =" 0, 0, eth0 ether = "0, 0, eth1"

Note: Do not add the startup parameter in "lilo. conf" to test your ISA card. If it fails, use the startup parameter.

If you use the method of passing the startup parameter, eth0 and eth1 are set according to the sequence found at startup.

*/Etc/HOSTNAME File

This file contains the Host Name of the system, including the full domain name, such as deep.openarch.com.

*/Etc/sysconfig/network-scripts/ifcfg-ethN File