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-NAME="NET-COMMON-CONFIGURING-IP-ADDRESSES">Chapter 35. Configuring IP Addresses</H1
-><P
->Each interface (“eth0” and “eth1”)
-has independent configuration of its setup. Each can be set up
-manually (in which case you must write code to do this), or by using
-<SPAN
-CLASS="ACRONYM"
->BOOTP/DHCP</SPAN
->,
-or explicitly, with configured values. If additional
-interfaces are added, these must be configured manually.</P
-><P
->The configurable values are: </P
-><P
-></P
-><UL
-><LI
-><P
->IP address</P
-></LI
-><LI
-><P
->netmask</P
-></LI
-><LI
-><P
->broadcast address</P
-></LI
-><LI
-><P
->gateway/router</P
-></LI
-><LI
-><P
->server address.</P
-></LI
-></UL
-><P
->Server address is the DHCP server if applicable, but in addition,
-many test cases use it as “the machine to talk to” in
-whatever manner the test exercises the protocol stack.</P
-><P
->The initialization is invoked by calling the C routine
-<TABLE
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-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
->void <TT
-CLASS="FUNCTION"
->init_all_network_interfaces</TT
->(void);</PRE
-></TD
-></TR
-></TABLE
-></P
-><P
->Additionally, if the system is configured to support IPv6 then each
-interface may have an address assigned which is a composite of a 64 bit
-prefix and the 32 bit IPv4 address for that interface.
-The prefix is controlled by the CDL setting
-CYGHWR_NET_DRIVER_ETH0_IPV6_PREFIX for “eth0”, etc.
-This is a CDL booldata type, allowing this address to be suppressed if
-not desired.</P
-><P
->Refer to the test cases,
-<TT
-CLASS="FILENAME"
->…/packages/net/common/<TT
-CLASS="REPLACEABLE"
-><I
->VERSION</I
-></TT
->/tests/ftp_test.c</TT
->
-for example usage, and the source files in
-<TT
-CLASS="FILENAME"
->…/packages/net/common/<TT
-CLASS="REPLACEABLE"
-><I
->VERSION</I
-></TT
->/src/bootp_support.c</TT
->
-and
-<TT
-CLASS="FILENAME"
->network_support.c</TT
->
-to see what that call does.</P
-><P
->This assumes that the MAC address (also known as
-<SPAN
-CLASS="ACRONYM"
->ESA</SPAN
-> or Ethernet Station Address)
-is already defined in the
-serial EEPROM or however the particular target implements this;
-support for setting the MAC address is hardware dependent.</P
-><P
->DHCP support is active by default, and there are configuration
-options to control it. Firstly, in the top level of the
-“Networking” configuration
-tree, “Use full DHCP instead of BOOTP” enables
-DHCP, and it contains an option to have the system provide a thread
-to renew DHCP leases and manage lease expiry. Secondly, the individual
-interfaces “eth0” and “eth1” each
-have new options within the “Use BOOTP/DHCP to
-initialize ‘<SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->ethX</I
-></SPAN
->’” to
-select whether to use DHCP rather than BOOTP.</P
-><P
->Note that you are completely at liberty to ignore this startup code and its
-configuration in building your application.
-<TT
-CLASS="FUNCTION"
->init_all_network_interfaces()</TT
->
-is provided for three main purposes:
-<P
-></P
-><UL
-><LI
-><P
->For use by Red Hat's own test programs.</P
-></LI
-><LI
-><P
->As an easy “get you going” utility for
-newcomers to <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
->.</P
-></LI
-><LI
-><P
->As readable example code from which further development
-might start.</P
-></LI
-></UL
-></P
-><P
->If your application has different requirements for bringing up
-available network interfaces, setting up routes, determining IP addresses
-and the like from the defaults that the example code provides, you can
-write your own initialization code to use whatever sequence of
-<TT
-CLASS="FUNCTION"
->ioctl()</TT
-> function
-calls carries out the desired setup. Analogously, in larger systems,
-a sequence of “ifconfig” invocations is used; these mostly
-map to <TT
-CLASS="FUNCTION"
->ioctl()</TT
-> calls to manipulate the state of
-the interface in question.</P
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