1 | <?xml version="1.0" encoding="ISO-8859-1"?> |
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2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" |
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3 | "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [ |
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4 | <!ENTITY % general-entities SYSTEM "../../general.ent"> |
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5 | %general-entities; |
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6 | ]> |
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7 | |
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8 | <sect1 id="ch-scripts-network"> |
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9 | <?dbhtml filename="network.html"?> |
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10 | |
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11 | <title>Configuring the network Script</title> |
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12 | |
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13 | <indexterm zone="ch-scripts-network"> |
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14 | <primary sortas="d-network">network</primary> |
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15 | <secondary>configuring</secondary></indexterm> |
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16 | |
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17 | <sect2> |
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18 | <title>Creating Network Interface Configuration Files</title> |
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19 | |
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20 | <para>Which interfaces are brought up and down by the network script |
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21 | depends on the files and directories in the <filename |
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22 | class="directory">/etc/network.d</filename> hierarchy. |
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23 | This directory should contain a file for each interface to be |
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24 | configured, such as <filename>interface.xyz</filename>, where |
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25 | <quote>xyz</quote> is a network interface name. Inside this file we |
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26 | would be defining the attributes to this interface, such as its IP |
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27 | address(es), subnet masks, and so forth.</para> |
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28 | |
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29 | <para>The following command creates the <filename>network.conf</filename> |
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30 | file for use by the entire system:</para> |
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31 | |
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32 | <screen><userinput>cd /etc/network.d && |
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33 | cat > /etc/network.d/interface.eth0 << "EOF" |
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34 | <literal># /etc/network.conf |
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35 | # Global Networking Configuration |
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36 | # interface configuration is in /etc/network.d/ |
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37 | |
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38 | # set to yes to enable networking |
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39 | NETWORKING=yes |
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40 | |
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41 | # set to yes to set default route to gateway |
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42 | USE_GATEWAY=no |
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43 | |
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44 | # set to gateway IP address |
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45 | GATEWAY=192.168.0.1</literal> |
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46 | EOF</userinput></screen> |
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47 | |
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48 | <para>The <envar>GATEWAY</envar> variable should contain the default |
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49 | gateway IP address, if one is present. If not, then comment out the |
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50 | variable entirely.</para> |
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51 | |
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52 | <para>The following command creates a sample <filename>interface.eth0</filename> |
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53 | file for the <emphasis>eth0</emphasis> device:</para> |
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54 | |
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55 | <screen><userinput>cd /etc/network.d && |
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56 | cat > /etc/network.d/interface.eth0 << "EOF" |
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57 | <literal># Network Interface Configuration |
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58 | |
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59 | # network device name |
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60 | INTERFACE=eth0 |
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61 | |
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62 | # set to yes to use DHCP instead of the settings below |
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63 | DHCP=no |
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64 | |
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65 | # IP address |
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66 | IPADDRESS=192.168.1.2 |
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67 | |
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68 | # netmask |
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69 | NETMASK=255.255.255.0 |
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70 | |
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71 | # broadcast address |
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72 | BROADCAST=192.168.1.255</literal> |
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73 | EOF</userinput></screen> |
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74 | |
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75 | <para>The <envar>INTERFACE</envar> variable should contain the name of |
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76 | the interface interface.</para> |
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77 | |
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78 | <para>The <envar>DHCP</envar> variable if set to yes will allow you to |
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79 | use dhcp. If set to no, you will need to configure the rest of the options.</para> |
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80 | |
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81 | <para>The <envar>IPADDRESS</envar> variable should contain the default |
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82 | IP address for this interface.</para> |
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83 | |
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84 | <para>The <envar>NETMASK</envar> variable should contain the default |
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85 | Subnet Mask for the IP address for this interface.</para> |
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86 | |
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87 | <para>The <envar>BROADCAST</envar> variable should contain the default |
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88 | Broadcast Address for the Subnet Mask of the IP Range being used on |
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89 | this interface.</para> |
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90 | |
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91 | </sect2> |
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92 | |
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93 | <sect2 id="resolv.conf"> |
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94 | <title>Creating the /etc/resolv.conf File</title> |
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95 | |
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96 | <indexterm zone="resolv.conf"> |
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97 | <primary sortas="e-/etc/resolv.conf">/etc/resolv.conf</primary> |
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98 | </indexterm> |
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99 | |
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100 | <para>If the system is going to be connected to the Internet, it will |
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101 | need some means of Domain Name Service (DNS) name resolution to |
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102 | resolve Internet domain names to IP addresses, and vice versa. This is |
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103 | best achieved by placing the IP address of the DNS server, available |
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104 | from the ISP or network administrator, into |
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105 | <filename>/etc/resolv.conf</filename>. Create the file by running the |
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106 | following:</para> |
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107 | |
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108 | <screen><userinput>cat > /etc/resolv.conf << "EOF" |
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109 | <literal># Begin /etc/resolv.conf |
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110 | |
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111 | domain <replaceable>[Your Domain Name]</replaceable> |
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112 | nameserver <replaceable>[IP address of your primary nameserver]</replaceable> |
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113 | nameserver <replaceable>[IP address of your secondary nameserver]</replaceable> |
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114 | |
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115 | # End /etc/resolv.conf</literal> |
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116 | EOF</userinput></screen> |
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117 | |
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118 | <para>Replace <replaceable>[IP address of the nameserver]</replaceable> |
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119 | with the IP address of the DNS most appropriate for the setup. There will |
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120 | often be more than one entry (requirements demand secondary servers for |
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121 | fallback capability). If you only need or want one DNS server, remove the |
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122 | second <emphasis>nameserver</emphasis> line from the file. The IP address |
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123 | may also be a router on the local network.</para> |
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124 | |
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125 | </sect2> |
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126 | |
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127 | </sect1> |
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