前提:系统已经实现DNS(即使用ping www.baidu.com测试时能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 <Tim@Rikers.org> [ -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 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] + Stopped ping www.baidu.com 5. 如果是双网卡必须用参数指明 例:udhcpc -i eth1 |
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