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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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>Configuring IP Addresses</TITLE
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><H1
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><A
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NAME="NET-COMMON-CONFIGURING-IP-ADDRESSES">Chapter 35. Configuring IP Addresses</H1
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><P
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>Each interface (&#8220;eth0&#8221; and &#8220;eth1&#8221;)
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has independent configuration of its setup.  Each can be set up
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manually (in which case you must write code to do this), or by using
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<SPAN
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CLASS="ACRONYM"
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>BOOTP/DHCP</SPAN
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>,
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or explicitly, with configured values. If additional
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interfaces are added, these must be configured manually.</P
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><P
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>The configurable values are: </P
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><P
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></P
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><UL
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><LI
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><P
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>IP address</P
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></LI
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><LI
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><P
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>netmask</P
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></LI
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><LI
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><P
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>broadcast address</P
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></LI
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><LI
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><P
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>gateway/router</P
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></LI
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><LI
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><P
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>server address.</P
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></LI
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></UL
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><P
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>Server address is the DHCP server if applicable, but in addition,
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many test cases use it as &#8220;the machine to talk to&#8221; in
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whatever manner the test exercises the protocol stack.</P
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><P
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>The initialization is invoked by calling the C routine
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><PRE
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CLASS="PROGRAMLISTING"
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>void <TT
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>init_all_network_interfaces</TT
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>(void);</PRE
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></TD
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></P
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><P
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>Additionally, if the system is configured to support IPv6 then each
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interface may have an address assigned which is a composite of a 64 bit
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prefix and the 32 bit IPv4 address for that interface.
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The prefix is controlled by the CDL setting
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CYGHWR_NET_DRIVER_ETH0_IPV6_PREFIX for &#8220;eth0&#8221;, etc.
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This is a CDL booldata type, allowing this address to be suppressed if
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not desired.</P
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><P
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>Refer to the test cases,
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<TT
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>&#8230;/packages/net/common/<TT
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><I
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>VERSION</I
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>/tests/ftp_test.c</TT
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>
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for example usage, and the source files in
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<TT
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>&#8230;/packages/net/common/<TT
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>/src/bootp_support.c</TT
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>
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and
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<TT
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CLASS="FILENAME"
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>network_support.c</TT
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>
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to see what that call does.</P
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><P
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>This assumes that the MAC address (also known as
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<SPAN
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CLASS="ACRONYM"
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>ESA</SPAN
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> or Ethernet Station Address)
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is already defined in the
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serial EEPROM or however the particular target implements this;
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support for setting the MAC address is hardware dependent.</P
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><P
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>DHCP support is active by default, and there are configuration
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options to control it.  Firstly, in the top level of the
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&#8220;Networking&#8221; configuration
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tree, &#8220;Use full DHCP instead of BOOTP&#8221; enables
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DHCP, and it contains an option to have the system provide a thread
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to renew DHCP leases and manage lease expiry. Secondly, the individual
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interfaces &#8220;eth0&#8221; and &#8220;eth1&#8221; each
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have new options within the &#8220;Use BOOTP/DHCP to
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initialize &#8216;<SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>ethX</I
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></SPAN
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>&#8217;&#8221; to
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select whether to use DHCP rather than BOOTP.</P
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><P
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>Note that you are completely at liberty to ignore this startup code and its
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configuration in building your application.
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<TT
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CLASS="FUNCTION"
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>init_all_network_interfaces()</TT
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>
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is provided for three main purposes:
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<P
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></P
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>For use by Red Hat's own test programs.</P
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>As an easy &#8220;get you going&#8221; utility for
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newcomers to <SPAN
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>eCos</SPAN
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>.</P
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>As readable example code from which further development
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might start.</P
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></P
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><P
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>If your application has different requirements for bringing up
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available network interfaces, setting up routes, determining IP addresses
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and the like from the defaults that the example code provides, you can
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write your own initialization code to use whatever sequence of
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<TT
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CLASS="FUNCTION"
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>ioctl()</TT
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> function
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calls carries out the desired setup.  Analogously, in larger systems,
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a sequence of &#8220;ifconfig&#8221; invocations is used; these mostly
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map to <TT
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CLASS="FUNCTION"
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>ioctl()</TT
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> calls to manipulate the state of
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the interface in question.</P
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