1 | <?xml version="1.0" encoding="ISO-8859-1"?> |
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2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" |
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3 | "http://www.oasis-open.org/docbook/xml/4.5/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>cat > ${CLFS}/etc/network.conf << "EOF" |
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33 | <literal># /etc/network.conf |
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34 | # Global Networking Configuration |
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35 | # interface configuration is in /etc/network.d/ |
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36 | |
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37 | # set to yes to enable networking |
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38 | NETWORKING=yes |
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39 | |
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40 | # set to yes to set default route to gateway |
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41 | USE_GATEWAY=no |
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42 | |
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43 | # set to gateway IP address |
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44 | GATEWAY=192.168.0.1 |
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45 | |
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46 | # Interfaces to add to br0 bridge |
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47 | # Leave commented to not setup a network bridge |
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48 | # Substitute br0 for eth0 in the interface.eth0 sample below to bring up br0 |
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49 | # instead |
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50 | # bcm47xx with vlans: |
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51 | #BRIDGE_INTERFACES="eth0.0 eth0.1 wlan0" |
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52 | # Other access point with a wired eth0 and a wireless wlan0 interface: |
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53 | #BRIDGE_INTERFACES="eth0 wlan0" |
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54 | </literal> |
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55 | EOF</userinput></screen> |
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56 | |
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57 | <para>The <envar>GATEWAY</envar> variable should contain the default |
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58 | gateway IP address, if one is present. If not, then comment out the |
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59 | variable entirely.</para> |
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60 | |
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61 | <para>The following command creates a sample <filename>interface.eth0</filename> |
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62 | file for the <emphasis>eth0</emphasis> device:</para> |
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63 | |
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64 | <screen><userinput>mkdir ${CLFS}/etc/network.d && |
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65 | cat > ${CLFS}/etc/network.d/interface.eth0 << "EOF" |
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66 | <literal># Network Interface Configuration |
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67 | |
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68 | # network device name |
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69 | INTERFACE=eth0 |
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70 | |
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71 | # set to yes to use DHCP instead of the settings below |
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72 | DHCP=no |
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73 | |
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74 | # IP address |
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75 | IPADDRESS=192.168.1.2 |
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76 | |
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77 | # netmask |
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78 | NETMASK=255.255.255.0 |
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79 | |
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80 | # broadcast address |
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81 | BROADCAST=192.168.1.255</literal> |
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82 | EOF</userinput></screen> |
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83 | |
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84 | <para>The <envar>INTERFACE</envar> variable should contain the name of |
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85 | the interface interface.</para> |
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86 | |
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87 | <para>The <envar>DHCP</envar> variable if set to yes will allow you to |
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88 | use dhcp. If set to no, you will need to configure the rest of the options.</para> |
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89 | |
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90 | <para>The <envar>IPADDRESS</envar> variable should contain the default |
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91 | IP address for this interface.</para> |
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92 | |
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93 | <para>The <envar>NETMASK</envar> variable should contain the default |
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94 | Subnet Mask for the IP address for this interface.</para> |
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95 | |
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96 | <para>The <envar>BROADCAST</envar> variable should contain the default |
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97 | Broadcast Address for the Subnet Mask of the IP Range being used on |
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98 | this interface.</para> |
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99 | |
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100 | </sect2> |
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101 | |
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102 | <sect2 id="udhcpc.conf"> |
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103 | <title>Creating the ${CLFS}/etc/udhcpc.conf File</title> |
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104 | |
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105 | <indexterm zone="udhcpc.conf"> |
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106 | <primary sortas="e-/etc/udhcpc.conf">/etc/udhcpc.conf</primary> |
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107 | </indexterm> |
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108 | |
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109 | <para>For DHCP to work properly a configuration script is needed. |
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110 | Create a sample udhcpc.conf:</para> |
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111 | |
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112 | <screen><userinput>cat > ${CLFS}/etc/udhcpc.conf << "EOF" |
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113 | <literal>#!/bin/sh |
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114 | # udhcpc Interface Configuration |
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115 | # Based on http://lists.debian.org/debian-boot/2002/11/msg00500.html |
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116 | # udhcpc script edited by Tim Riker <Tim@Rikers.org> |
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117 | |
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118 | [ -z "$1" ] && echo "Error: should be called from udhcpc" && exit 1 |
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119 | |
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120 | RESOLV_CONF="/etc/resolv.conf" |
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121 | RESOLV_BAK="/etc/resolv.bak" |
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122 | |
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123 | [ -n "$broadcast" ] && BROADCAST="broadcast $broadcast" |
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124 | [ -n "$subnet" ] && NETMASK="netmask $subnet" |
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125 | |
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126 | case "$1" in |
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127 | deconfig) |
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128 | if [ -f "$RESOLV_BAK" ]; then |
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129 | mv "$RESOLV_BAK" "$RESOLV_CONF" |
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130 | fi |
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131 | /sbin/ifconfig $interface 0.0.0.0 |
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132 | ;; |
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133 | |
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134 | renew|bound) |
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135 | /sbin/ifconfig $interface $ip $BROADCAST $NETMASK |
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136 | |
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137 | if [ -n "$router" ] ; then |
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138 | while route del default gw 0.0.0.0 dev $interface ; do |
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139 | true |
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140 | done |
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141 | |
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142 | for i in $router ; do |
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143 | route add default gw $i dev $interface |
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144 | done |
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145 | fi |
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146 | |
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147 | if [ ! -f "$RESOLV_BAK" ] && [ -f "$RESOLV_CONF" ]; then |
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148 | mv "$RESOLV_CONF" "$RESOLV_BAK" |
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149 | fi |
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150 | |
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151 | echo -n > $RESOLV_CONF |
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152 | [ -n "$domain" ] && echo search $domain >> $RESOLV_CONF |
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153 | for i in $dns ; do |
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154 | echo nameserver $i >> $RESOLV_CONF |
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155 | done |
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156 | ;; |
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157 | esac |
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158 | |
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159 | exit 0 |
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160 | </literal>EOF |
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161 | |
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162 | chmod +x ${CLFS}/etc/udhcpc.conf</userinput></screen> |
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163 | |
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164 | </sect2> |
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165 | |
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166 | <sect2 id="resolv.conf"> |
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167 | <title>Creating the ${CLFS}/etc/resolv.conf File</title> |
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168 | |
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169 | <indexterm zone="resolv.conf"> |
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170 | <primary sortas="e-/etc/resolv.conf">/etc/resolv.conf</primary> |
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171 | </indexterm> |
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172 | |
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173 | <para>If the system is going to be connected to the Internet, it will |
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174 | need some means of Domain Name Service (DNS) name resolution to |
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175 | resolve Internet domain names to IP addresses, and vice versa. This is |
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176 | best achieved by placing the IP address of the DNS server, available |
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177 | from the ISP or network administrator, into |
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178 | <filename>/etc/resolv.conf</filename>. Create the file by running the |
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179 | following:</para> |
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180 | |
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181 | <screen><userinput>cat > ${CLFS}/etc/resolv.conf << "EOF" |
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182 | <literal># Begin /etc/resolv.conf |
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183 | |
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184 | domain <replaceable>[Your Domain Name]</replaceable> |
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185 | nameserver <replaceable>[IP address of your primary nameserver]</replaceable> |
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186 | nameserver <replaceable>[IP address of your secondary nameserver]</replaceable> |
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187 | |
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188 | # End /etc/resolv.conf</literal> |
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189 | EOF</userinput></screen> |
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190 | |
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191 | <para>Replace <replaceable>[IP address of the nameserver]</replaceable> |
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192 | with the IP address of the DNS most appropriate for the setup. There will |
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193 | often be more than one entry (requirements demand secondary servers for |
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194 | fallback capability). If you only need or want one DNS server, remove the |
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195 | second <emphasis>nameserver</emphasis> line from the file. The IP address |
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196 | may also be a router on the local network.</para> |
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197 | |
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198 | </sect2> |
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199 | |
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200 | </sect1> |
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