DHCP客户端程序移植笔记(全).doc

《DHCP客户端程序移植笔记(全).doc》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、DHCP程序运行与调试实现的目标：开机时自动获取IP地址，若没有可用的IP地址，选用autoip；或者选用静态配置的ip地址。DHCP客户端程序有多种，本系统选用的busybox下的dhcpc。［1］修改内核配置；在内核中添加以下选项：Networking--->[*]NetworkingsupportNetworkingoptions---><*>Packetsocket//添加.配置CONFIG_PACKET[*]IP:DHCPsupport//添加[*]Networkpacketfiltering(replacesipchains)--->//添加，后面子选项可不选，配置CON

2、FIG_NETFILTER？---Networkpacketfilteringframework(Netfilter)说明：若没选<*>Packetsocket,[*]Networkpacketfiltering(replacesipchains)--->选项，在执行udhcpc命令时出现如下错误：~#udhcpcudhcpc(v-pre)startedudhcpc[208]:udhcpc(v-pre)startedFATAL:couldn'tlistenonsocket,Addressfamilynotsupportedbyprotocoludhcpc[208]:FATAL:cou

3、ldn'tlistenonsocket,Addressfamilynotsupportedbyprotocol［2］修改busybox配置，Busybox中添加以下选项：NetworkingUtilities --->  udhcpServer/Client --->[]udhcpServer(udhcpd) //在此不作服务端，故不选。生成udhcpd命令[*]udhcpClient(udhcpc)//生成udhcpc命令[]Leasedisplayutility(dumpleases)[]Logudhcpmessagestosyslog(insteadofstdout)[]Com

4、pileudhcpwithnoisydebuggingmessages若busybox没编译相应选项，也可从网上下载相应文件，用arm-linux交叉编译得到udhcpd,udhcpc命令copy到usr/sbin下就可以了。我从网上下的udhcp_cvs20050303.orig.tar.gz文件解压后修改Makefile文件在19行添加CROSS_COMPILE=arm-linux-注释12行的COMBINED_BINARY=1，否则不生成udhcpc命令［3］运行程序：up-tech:/sbin#./udhcpcudhcpc(v1.15.3)startedSendingdisc

5、over...Sendingselectfor192.168.1.102...ReceivedDHCPNAKSendingdiscover...Sendingselectfor192.168.1.101...Leaseof192.168.1.101obtained,leasetime7200［4］将busybox目录下：examples/udhcp/simple.script拷贝到根目录文件夹/usr/share/udhcpc/default.script。覆盖掉原始文件。重新制作根目录。从busybox的examples/udhcp/下copysimple.script文件到开发板

6、/usr/share/udhcpc/下，并重命名为default.script，udhcp_cvs20050303.orig.tar.gz中也有这样的文件。修改ip没有成功！up-tech:/sbin#./udhcpc udhcpc(v1.15.3)started SettingIPaddress0.0.0.0oneth0 <1>/usr/share/udhcpc/default.script:line45:ifconfig:notfound Sendingdiscover... Sendingselectfor192.168.1.101... Leaseof192.168.1.10

7、1obtained,leasetime7200 SettingIPaddress192.168.1.101oneth0 <2>/usr/share/udhcpc/default.script:line45:ifconfig:notfound Deletingrouters <3>/usr/share/udhcpc/default.script:line45:route:notfound Addingrouter192.168.1.1 <4>/usr/sha