前提：系统已经实现DNS(即便用通)。html
1．在内核中添加如下选项：linux
Networking—>dom
[*] Networking supportsocket
Networking options—>测试
Packet socket//添加.配置CONFIG_PACKETspa
[ * ]IP: DHCP support//添加debug
[ * ] Network packet filtering (replaces ipchains)—>//添加，后面子选项可不选，配置CONFIG_NETFILTERorm
说明：若没选 Packet socket, [ * ] Network packet filtering (replaces ipchains)—>选项，在执行udhcpc命令时出现以下错误：router
~ # udhcpcserver
udhcpc (v0.9.9-pre) started
udhcpc[208]: udhcpc (v0.9.9-pre) started
FATAL: couldn’t listen on socket, Address family not supported by protocol
udhcpc[208]: FATAL: couldn’t listen on socket, Address family not supported by protocol
2．Busybox中添加如下选项：
Networking Utilities—>
udhcp Server/Client—>
[] udhcp Server (udhcpd)//在此不做服务端，故不选。生成udhcpd命令
[*] udhcp Client (udhcpc)//生成udhcpc命令
[ ] Lease display utility (dumpleases)
[ ]Log udhcp messages to syslog (instead of stdout)
[ ]Compile udhcp with noisy debugging messages
若busybox没编译相应选项，也可从网上下载相应文件，用arm-linux交叉编译获得udhcpd,udhcpc命令copy到usr/sbin下就能够了。
我从网上下的udhcp_0.9.8cvs20050303.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，不然不生成udhcpc命令。
3．建相关配置文件
从busybox的examples/udhcp/下copy simple.script文件到开发板/usr/share/udhcpc/下，并重命名为default.script，udhcp_0.9.8cvs20050303.orig.tar.gz中也有这样的文件。
[root@localhost root]# vi usr/share/udhcpc/default.script
#!/bin/sh
# udhcpc script edited by Tim Riker
[ -z “$1” ] && echo “Error: should be called from udhcpc” && exit 1
RESOLV_CONF=”/etc/resolv.conf”
[ -n “$broadcast” ] && BROADCAST=”broadcast $broadcast”
[ -n “$subnet” ] && NETMASK=”netmask $subnet”
case “$1” in
deconfig)
/sbin/ifconfig $interface 0.0.0.0
;;
renew|bound)
/sbin/ifconfig $interface $ip $BROADCAST $NETMASK
if [ -n “$router” ] ; then
echo “deleting routers”
while route del default gw 0.0.0.0 dev $interface ; do
:
done
for i in $router ; do
route add default gw $i dev $interface
done
fi
echo -n > $RESOLV_CONF
[ -n “$domain” ] && echo search $domain >> $RESOLV_CONF
for i in $dns ; do
echo adding dns $i
echo nameserver $i >> $RESOLV_CONF
done
;;
esac
exit 0
4．重启开发板，执行udhcpc就可自动获取IP地址了，如下是执行udhcpc的输出信息：
~ # udhcpc
udhcpc (v0.9.9-pre) started
udhcpc[228]: udhcpc (v0.9.9-pre) started
Sending discover…
udhcpc[228]: Sending discover…
Sending select for 192.168.1.109…
udhcpc[228]: Sending select for 192.168.1.109…
Lease of 192.168.1.109 obtained, lease time 86400
udhcpc[228]: Lease of 192.168.1.109 obtained, lease time 86400
deleting routers
route: SIOC[ADD|DEL]RT: No such process
adding dns 192.168.0.1
~ # ping www.baidu.com
PING www.a.shifen.com (220.181.38.4): 56 data bytes
64 bytes from 220.181.38.4: icmp_seq=0 ttl=52 time=1219.0 ms
[1] + Stoppedping www.baidu.com
5．若是是双网卡必须用参数指明
例：udhcpc-i eth1