WiFi Card DHCP客户端设定问题

WiFi Card 使用 DHCP client 设置问题

1. Busybox里有个工具叫udhcpc，专门用来dhcp client设定问题，使用方法如下：

（注意：必须在路由器开通DHCP服务并配置好DNS信息。）

udhcpc -b -i eth1

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#
# udhcpc -b -i eth1
udhcpc (v1.13.4) started
Sending discover...
Sending select for 192.168.56.100...
Lease of 192.168.56.100 obtained, lease time 7200
deleting routers
route: SIOCDELRT: No such process
adding dns 192.168.0.126
adding dns 192.168.0.111
#

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2. 使用时要设定一下udhcpc的配置文件（我这里要修改ifconfig路径），文件内容如下：

/root/rootfs/mnt/sysfs/udhcpc/default.script

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#!/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)
        /bin/ifconfig $interface up
        ;;

    renew|bound)
        /bin/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

            metric=0
            for i in $router ; do
                route add default gw $i dev $interface metric $((metric++))
            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

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