[f45b1953] | 1 | <sect1 id="dhcpclient" xreflabel="Configuring dhcp for a client">
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| 2 | <?dbhtml filename="configdhcp.html" dir="connect"?>
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| 3 | <title>Configuring dhcp for a client</title>
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| 4 |
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| 5 | <sect2><title>Config files</title>
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| 6 | <para><userinput>/etc/sysconfig/network,
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| 7 | /etc/sysconfig/network-devices/ifup-eth0,
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| 8 | /etc/sysconfig/network-devices/ifdown-eth0,
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| 9 | /etc/sysconfig/networkdevices/ifconfig.eth0</userinput></para>
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| 10 | </sect2>
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| 11 |
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| 12 | <sect2><title>Configuration Information</title>
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| 13 |
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| 14 | <para>Note that we use <userinput>eth0</userinput> as the interface
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| 15 | throughout these instructions. If you want to configure a different (or
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| 16 | more than one) interface, simply replace <userinput>eth0</userinput>
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| 17 | with the interface you wish to use.</para>
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| 18 |
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| 19 | <para>These instructions will convert the configuration files from LFS
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| 20 | (a static configuration) to a DHCP configuration. Note that static and
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| 21 | DHCP interfaces can co-exist on a LFS system, only make the
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| 22 | alterations to those interfaces which need to support DHCP.</para>
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| 23 |
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| 24 | <para>The first step is to remove the GATEWAY and GATEWAY_IF variables
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| 25 | from <filename>/etc/sysconfig/network</filename>. This should only be done
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| 26 | if the default interface you intend to use will be using DHCP and only
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| 27 | needs to be done once; regardless of how many interfaces you are setting
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| 28 | up.</para>
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| 29 |
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| 30 | <para><screen><userinput>cd /etc/sysconfig &&
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| 31 | cp network network.bak &&
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| 32 | sed "s/GATEWAY/# GATEWAY/" network.bak > network</userinput></screen></para>
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| 33 |
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| 34 | <para>Now you can create the appropriate <filename>ifconfig.eth0</filename>
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| 35 | file with the following commands (note that this will overwrite any
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| 36 | existing file):</para>
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| 37 |
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| 38 | <para><screen><userinput>cd /etc/sysconfig/network-devices &&
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| 39 | cat > ifconfig.eth0 << "EOF"</userinput>
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| 40 | ONBOOT=yes
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| 41 | DHCP_PROG=<path to dhcp>
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| 42 | DHCP_START=<start parameters>
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| 43 | DHCP_STOP=<stop parameter>
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| 44 | <userinput>EOF</userinput></screen></para>
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| 45 |
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| 46 | <para>Review the appropriate manpages for parameters; for example, the
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| 47 | stop parameter for dhcpcd is '-k', while the stop parameter for dhclient
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| 48 | is '-r'.</para>
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| 49 |
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| 50 | <para>You then need to create DHCP specific scripts. First, the
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| 51 | <filename>ifup-eth0</filename> script:</para>
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| 52 |
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| 53 | <para><screen><userinput>cat > ifup-eth0 << "EOF" </userinput>
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| 54 | #!/bin/sh
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| 55 |
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| 56 | source /etc/sysconfig/rc || exit
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| 57 | source $rc_functions || exit
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| 58 | source $network_devices/ifconfig.eth0 || exit
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| 59 |
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| 60 | echo "Bringing up the eth0 interface..."
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| 61 | modprobe eth0
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| 62 | loadproc $DHCP_PROG $DHCP_START
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| 63 | <userinput>EOF</userinput></screen></para>
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| 64 |
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| 65 | <para>Then the <filename>ifdown-eth0</filename> script:</para>
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| 66 |
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| 67 | <para><screen><userinput>cat > ifdown-eth0 << "EOF" </userinput>
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| 68 | #!/bin/sh
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| 69 |
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| 70 | source /etc/sysconfig/rc || exit
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| 71 | source $rc_functions || exit
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| 72 | source $network_devices/ifconfig.eth0 || exit
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| 73 |
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| 74 | echo "Bringing down the eth0 interface..."
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| 75 | $DHCP_PROG $DHCP_STOP
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| 76 | evaluate_retval
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| 77 | <userinput>EOF</userinput></screen></para>
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| 78 |
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| 79 | <para>Finally, we need to make these scripts executable:</para>
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| 80 |
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| 81 | <para><screen><userinput>chmod 755 ifup-eth0 &&
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| 82 | chmod 755 ifdown-eth0</userinput></screen></para>
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| 83 |
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| 84 | </sect2>
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| 85 |
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| 86 | </sect1>
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| 87 |
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