1 | <sect1 id="ch07-ethnet">
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2 | <title>Creating the ethnet script</title>
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3 |
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4 | <para>This section only applies if a user is going to configure a network card.
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5 | If not, this section can be skipped.</para>
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6 |
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7 | <para>Create the <filename>/etc/init.d/ethnet</filename> script by running the
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8 | following command:</para>
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9 |
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10 | <para><screen><userinput>cat > /etc/init.d/ethnet << "EOF"</userinput>
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11 | #!/bin/sh
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12 | # Begin /etc/init.d/ethnet
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13 | #
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14 | # Main script by Gerard Beekmans - gerard@linuxfromscratch.org
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15 | # GATEWAY check by Jean-François Le Ray - jfleray@club-internet.fr
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16 | # "Specify which IF to use to reach default GATEWAY" by
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17 | # Graham Cantin - gcantin@pacbell.net
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18 | #
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19 |
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20 | #
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21 | # Include the functions declared in the /etc/init.d/functions file
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22 | # and the variables from the /etc/sysconfig/network file.
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23 | #
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24 |
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25 | source /etc/init.d/functions
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26 | source /etc/sysconfig/network
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27 |
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28 | case "$1" in
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29 | start)
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30 |
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31 | #
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32 | # Obtain all the network card configuration files
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33 | #
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34 |
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35 | for interface in $(/bin/ls /etc/sysconfig/nic-config/ifcfg* | \
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36 | grep -v ifcfg-lo)
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37 | do
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38 | #
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39 | # Load the variables from that file
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40 | #
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41 |
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42 | source $interface
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43 | #
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44 | # If the ONBOOT variable is set to yes, process this file and bring the
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45 | # interface up.
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46 | #
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47 |
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48 | if [ "$ONBOOT" == yes ]
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49 | then
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50 | echo -n "Bringing up the $DEVICE interface..."
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51 | /sbin/ifconfig $DEVICE $IP broadcast $BROADCAST \
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52 | netmask $NETMASK
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53 | evaluate_retval
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54 | fi
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55 | done
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56 |
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57 | #
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58 | # If the /etc/sysconfig/network file contains a GATEWAY variable, set
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59 | # the default gateway and the interface through which the default
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60 | # gateway can be reached.
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61 | #
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62 |
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63 | if [ "$GATEWAY" != "" ]; then
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64 | echo -n "Setting up routing for $GATEWAY_IF interface..."
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65 | /sbin/route add default gateway $GATEWAY \
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66 | metric 1 dev $GATEWAY_IF
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67 | evaluate_retval
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68 | fi
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69 | ;;
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70 |
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71 | stop)
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72 |
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73 | #
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74 | # Obtain all the network card configuration files
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75 | #
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76 |
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77 | for interface in $(/bin/ls /etc/sysconfig/nic-config/ifcfg* | \
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78 | grep -v ifcfg-lo)
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79 | do
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80 | #
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81 | # Load the variables from that file
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82 | #
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83 |
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84 | source $interface
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85 | #
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86 | # If the ONBOOT variable is set, process the file and bring the
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87 | # interface down
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88 | #
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89 |
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90 | if [ $ONBOOT == yes ]
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91 | then
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92 | echo -n "Bringing down the $DEVICE interface..."
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93 | /sbin/ifconfig $DEVICE down
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94 | evaluate_retval
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95 | fi
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96 | done
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97 | ;;
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98 |
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99 | restart)
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100 | $0 stop
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101 | sleep 1
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102 | $0 start
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103 | ;;
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104 | *)
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105 | echo "Usage: $0 {start|stop|restart}"
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106 | exit 1
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107 | ;;
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108 | esac
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109 |
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110 | # End /etc/init.d/ethnet
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111 | <userinput>EOF</userinput></screen></para>
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112 |
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113 | <sect2>
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114 | <title>Adding default gateway to /etc/sysconfig/network</title>
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115 |
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116 | <para>If a default gateway is required to be setup, the
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117 | following command does that:</para>
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118 |
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119 | <para><screen><userinput>cat >> /etc/sysconfig/network << "EOF"</userinput>
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120 | GATEWAY=192.168.1.2
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121 | GATEWAY_IF=eth0
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122 | <userinput>EOF</userinput></screen></para>
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123 |
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124 | <para>GATEWAY and GATEWAY_IF need to be changed to match the network setup.
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125 | GATEWAY contains the address of the default gateway, and GATEWAY_IF
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126 | contains the network interface through which that default gateway can
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127 | be reached.</para>
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128 |
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129 | </sect2>
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130 |
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131 | <sect2>
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132 | <title>Creating NIC configuration files</title>
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133 |
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134 | <para>Which interfaces are brought up and down by the ethnet script depends on
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135 | the files in the /etc/sysconfig/nic-config directory. This
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136 | directory should contain files in the form of ifcfg-x where x is an
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137 | identification number (or whatever a user named it).</para>
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138 |
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139 | <para>First the nic-config directory is created by running:</para>
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140 |
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141 | <para><screen><userinput>mkdir /etc/sysconfig/nic-config</userinput></screen></para>
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142 |
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143 | <para>Now, new files are created in that directory containing the following.
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144 | The following command creates a sample file ifcfg-eth0:</para>
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145 |
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146 | <para><screen><userinput>cat > /etc/sysconfig/nic-config/ifcfg-eth0 << "EOF"</userinput>
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147 | ONBOOT=yes
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148 | DEVICE=eth0
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149 | IP=192.168.1.1
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150 | NETMASK=255.255.255.0
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151 | BROADCAST=192.168.1.255
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152 | <userinput>EOF</userinput></screen></para>
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153 |
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154 | <para>Of course, the values of those four variables have to be changed
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155 | in every file to
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156 | match the proper setup. Usually NETMASK and BROADCAST will remain the
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157 | same, just the DEVICE IP variables will change per network interface. If
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158 | the ONBOOT variable is set to yes, the ethnet script will bring it up
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159 | during boot up of the system. If set to anything else but yes it will be
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160 | ignored by the ethnet script and thus not brought up.</para>
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161 |
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162 | </sect2>
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163 |
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164 | </sect1>
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165 |
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