分类: LINUX
2010-07-16 04:26:05
前提:系统已经实现DNS(即使用ping 通)。
1. 在内核中添加以下选项:
Networking --->
[*] Networking support
Networking options --->
<* > Packet socket //添加.配置CONFIG_PACKET
[ * ] IP: DHCP support //添加
[ * ] Network packet filtering (replaces ipchains) ---> //添加,后面子选项可不选,配置CONFIG_NETFILTER
说明:若没选<* > Packet socket, [ * ] Network packet filtering (replaces ipchains) --->选项,在执行udhcpc命令时出现如下错误:
~ # udhcpc
udhcpc (v
udhcpc[208]: udhcpc (v
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中添加以下选项:
Networking Utilities --->
udhcp Server/Client --->
[] udhcp Server (udhcpd) //在此不作服务端,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交叉编译得到udhcpd,udhcpc命令copy到usr/sbin下就可以了。
我从 网上 下的udhcp_
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. 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_
[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
;;
renew|bound)
/sbin/ifconfig $interface $ip $BROADCAST $NETMASK
if [ -n "$router" ] ; then
echo "deleting routers"
while route del default gw
:
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,以下是执行udhcpc的输出信息:
~ # udhcpc
udhcpc (v
udhcpc[228]: udhcpc (v
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
PING (220.181.38.4): 56 data bytes
64 bytes from 220.181.38.4: icmp_seq=0 ttl=52 time=1219.0 ms
[1] + Stopped ping
5. 如果是双网卡必须用参数指明
例:udhcpc -i eth1