编译环境:
Ubuntu 10.04、gcc-3.4.6-2f
1.1、配置Linux内核使能DHCP相关选项:
[*]Networking support -->
Networking support
Networking options -->
[*]Packet socket
[*]IP:kernel level autoconfiguration
[*] IP:DHCP support
[*]Network packet filtering framework(Netfilter) --> //下层子选项可不作配置
如下图:
1.2、配置Busybox,使能以下选项:
Networking Utilities
[*]udhcp server (udhcpd)
[*] dhcprelay
[*] Lease display utility (dumpleases)
[*]udhcp client (udhcpc)
[*] Verify that the offered address is free,using ARP ping
如下图:
1.3、使用Busybox下的simple.script
进入busybox目录:busybox1.19.2/example/udhcp/,拷贝文件simple.script到根文件系统的/usr/share/udhcpc/目录下,更名为default.simple,再将default.script中RESOLV_CONF=”/etc/resolv.conf”更改为RESOLV_CONF=”/tmp/resolv.conf”。
(说明:由于测试使用Cramfs文件系统,etc目录不可写,运行udhcpc无法在/etc目录下创建resolv.conf文件。)
1.4、拷贝工具
重新编译安装busybox,将安装文件拷至根文件系统目录,运行udhcpc即可动态获取IP。