1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
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3 | <!ENTITY % general-entities SYSTEM "../general.ent">
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4 | %general-entities;
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5 | ]>
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6 | <sect1 id="ch-scripts-network">
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7 | <title>Configuring the network script</title>
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8 | <?dbhtml filename="network.html"?>
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9 |
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10 | <indexterm zone="ch-scripts-network">
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11 | <primary sortas="d-network">network</primary>
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12 | <secondary>configuring</secondary></indexterm>
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13 |
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14 | <para>This section only applies if a network card is to be
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15 | configured.</para>
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16 |
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17 | <para>If a network card will not be used, there is likely no need to
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18 | create any configuration files relating to network cards. If that is
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19 | the case, remove the <filename class="symlink">network</filename>
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20 | symlinks from all run-level directories (<filename
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21 | class="directory">/etc/rc.d/rc*.d</filename>).</para>
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22 |
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23 | <sect2>
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24 | <title>Creating network interface configuration files</title>
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25 |
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26 | <para>Which interfaces are brought up and down by the network script
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27 | depends on the files in the <filename
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28 | class="directory">/etc/sysconfig/network-devices</filename> directory.
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29 | This directory should contain files in the form of
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30 | <filename>ifconfig.xyz</filename>, where <quote>xyz</quote> is a
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31 | network interface name (such as eth0 or eth0:1)</para>
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32 |
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33 | <para>If the <filename
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34 | class="directory">/etc/sysconfig/network-devices</filename> directory
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35 | is to be renamed or moved, make sure to edit the
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36 | <filename>/etc/sysconfig/rc</filename> file and update the
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37 | <quote>network_devices</quote> option by providing it with the new
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38 | path.</para>
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39 |
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40 | <para>Now, new files are created in those directory. The following
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41 | command creates a sample <filename>ipv4</filename> file for the
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42 | <emphasis>eth0</emphasis> device:</para>
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43 |
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44 | <screen><userinput>cd /etc/sysconfig/network-devices &&
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45 | mkdir ifconfig.eth0 &&
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46 | cat > ifconfig.eth0/ipv4 << "EOF"
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47 | ONBOOT=yes
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48 | SERVICE=ipv4-static
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49 | IP=192.168.1.1
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50 | GATEWAY=192.168.1.2
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51 | PREFIX=24
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52 | BROADCAST=192.168.1.255
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53 | EOF</userinput></screen>
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54 |
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55 | <para>The values of those variables must be changed in every file to
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56 | match the proper setup. If the <emphasis>ONBOOT</emphasis> variable is
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57 | set to <quote>yes</quote>, the network script will bring up the
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58 | Network Interface Card (NIC) during the booting of the system. If set
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59 | to anything but <quote>yes</quote>, the NIC will be ignored by the
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60 | network script and not brought up.</para>
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61 |
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62 | <para>The <emphasis>SERVICE</emphasis> variable defines the method of
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63 | obtaining the IP address. The LFS bootscripts have a modular IP
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64 | assignment format, and creating additional files in the <filename
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65 | class="directory">/etc/sysconfig/network-devices/services</filename>
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66 | directory allows other IP assignment methods. This is commonly used
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67 | for DHCP, which is addressed in the BLFS book.</para>
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68 |
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69 | <para>The <emphasis>GATEWAY</emphasis> variable should contain the IP
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70 | the your default gateway, if one is present. If not, then comment out
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71 | the variable entirely.</para>
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72 |
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73 | <para>The <emphasis>PREFIX</emphasis> variable needs to contain the
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74 | number of bits used in the subnet. Each octet in an IP address is 8
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75 | bits. If the subnet's netmask is 255.255.255.0, then it is using the
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76 | first three octets (24 bits) to specify the network number. If the
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77 | netmask is 255.255.255.240 it would be using the first 28 bits.
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78 | Prefixes longer than 24 bits are commonly used by DSL- and cable-based
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79 | Internet Service Providers. In this example (PREFIX=24) the netmask
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80 | is 255.255.255.0. Adjust according to your subnet.</para>
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81 |
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82 | </sect2>
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83 |
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84 | <sect2 id="resolv.conf">
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85 | <title>Creating the /etc/resolv.conf file</title>
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86 | <indexterm zone="resolv.conf"><primary sortas="e-/etc/resolv.conf">/etc/resolv.conf</primary></indexterm>
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87 |
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88 | <para>If the system is going to be connected to the Internet, it will
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89 | need some means of DNS name resolution to resolve Internet domain
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90 | names to IP addresses, and vice versa. This is best achieved by
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91 | placing the IP address of the DNS server, available from the Internet
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92 | Service Provider (ISP) or network administrator, into
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93 | <filename>/etc/resolv.conf</filename>. Create the file by running the
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94 | following:</para>
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95 |
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96 | <screen><userinput>cat > /etc/resolv.conf << "EOF"
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97 | # Begin /etc/resolv.conf
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98 |
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99 | domain {<replaceable>[Your Domain Name]</replaceable>}
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100 | nameserver <replaceable>[IP address of your primary nameserver]</replaceable>
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101 | nameserver <replaceable>[IP address of your secondary nameserver]</replaceable>
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102 |
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103 | # End /etc/resolv.conf
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104 | EOF</userinput></screen>
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105 |
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106 | <para>Replace <replaceable>[IP address of the
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107 | nameserver]</replaceable> with the IP address of the DNS most
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108 | appropriate for the setup. There will often be more than one entry
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109 | (requirements demand secondary servers for fallback capability). If
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110 | you only need or want one DNS server, simply remove the second
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111 | <emphasis>nameserver</emphasis> line from the file. The IP address may
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112 | also be a router on the local network.</para>
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113 | </sect2>
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114 |
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115 | </sect1>
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116 |
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