[a9e389d] | 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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[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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[1d67150] | 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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[a9e389d] | 40 |
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[1d67150] | 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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[a9e389d] | 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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[1d67150] | 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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[a9e389d] | 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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