[a9e389d] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?> |
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[bd48e48] | 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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[a9e389d] | 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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[1d67150] | 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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[a9e389d] | 27 | address(es), subnet masks, and so forth.</para> |
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| 28 | |
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[1d67150] | 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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[a9e389d] | 31 | |
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[de9651e] | 32 | <screen><userinput>cat > ${CLFS}/etc/network.conf << "EOF" |
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[1d67150] | 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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[a9e389d] | 39 | |
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[1d67150] | 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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[423fe6b] | 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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[1d67150] | 55 | EOF</userinput></screen> |
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[a9e389d] | 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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[1d67150] | 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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[de9651e] | 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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[1d67150] | 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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[a9e389d] | 99 | |
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| 100 | </sect2> |
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| 101 | |
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[423fe6b] | 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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[49c9bc5] | 112 | <screen><userinput>cat > ${CLFS}/etc/udhcpc.conf << "EOF" |
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[423fe6b] | 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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[a9e389d] | 166 | <sect2 id="resolv.conf"> |
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[de9651e] | 167 | <title>Creating the ${CLFS}/etc/resolv.conf File</title> |
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[a9e389d] | 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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[de9651e] | 181 | <screen><userinput>cat > ${CLFS}/etc/resolv.conf << "EOF" |
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[a9e389d] | 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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