Adding Ethernet after Red Hat (Web site template) is installed If
Adding Ethernet after Red Hat is installed If Red Hat Linux is already installed when you want to add your Ethernet card, simply power down the system, install the card, and reboot the computer. If the card is supported, it is likely that the proper driver will be found and assigned to the board using the eth0 interface. At this point, you simply need to do a bit of configuration (mostly to assign an IP address to the interface) using the Network Configuration window (described in the Adding host names and IP addresses section later in this chapter). Adding two Ethernet cards If your computer is acting as a router between two LANs (or if it simply is connected to two LANs), you may need to do some special setup to get two LAN cards to work on your computer. If both cards are PCI or EISA LAN cards, they will probably be autodetected so no further configuration will be needed to add the cards. However, if at least one card is an ISA cards, you will need to add some information to your /etc/modules.conf file. To add two ISA cards to your computer, you need to identify the Ethernet interface associated with each card (eth0, eth1, etc.), then identify the I/O base addresses for each card. Then you must add this information to the /etc/modules.conf file. The following is an example: alias eth0 3c501 alias eth1 3c503 options 3c501 io=0×280 options 3c503 io=0×300 In this example, there is a 3Com 3c501 assigned to the eth0 interface and a 3c503 card assigned to eth1. The base addresses are 0×280 for the 3c501 card and 0×300 for the 3c503 card. The modules are loaded after your computer boots. If both cards you are adding are of the same type, you may be able to use a single options line (for example, options wd io=0×280,0×300) or, if the module supports only one card at a time, you may need two options lines (which results in the module being loaded twice). The best reference for supported Ethernet cards and modules is Appendix A of the Red Hat Linux Reference Guide. This guide contains a listing of Ethernet cards, the modules needed to use them, and the options you need with each module. For more information on adding multiple Ethernet cards, refer to the Ethernet-HOWTO document. You can also check out the Multiple Ethercards document at www.scyld.com/expert/multicard.html. Cross-Reference Chances are that if you are adding two or more LAN cards to one computer, you may want that computer to act as a router between the two networks. Setting up routing functions is described in Chapter 16. Configuring Host Computers Each computer you communicate with (including your computer) must have a unique address on the network. In TCP/IP, each computer needs to be assigned an IP address and (usually) a host name. When a user runs a program to communicate with another computer, the user typically enters the computer name (or IP address) that it wants to communicate with. There are two basic ways to assign a host name and IP address to the network interfaces: Static Addresses With static IP addresses, each computer has its IP address entered in manually. This can be done at Red Hat Linux installation time or later using the Network Configuration window. With this method, the computer has the same IP address each time it boots.
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