/********************************************************************

 *                   busybox filesystem ifup

 * 声明：

 *     本文主要是记录busybox文件系统中ifup使用报错的解决方式。

 *

 *                                 2016-1-24 深圳 南山平山村 曾剑锋

 *******************************************************************/

一、错误处理1：

    . 现象：

        udevd version  started

        zengjf login: root

        login[]: root login on 'ttymxc0'

        udhcpc (v1.24.1) started

        Setting IP address 0.0.0.0 on eth0

        eth0: Freescale FEC PHY driver [Generic PHY] (mii_bus:phy_addr=:, irq=-)

        Sending discover...

        Sending discover...

        Sending discover...

        No lease, forking to background

        [zengjf@root ~]# ifup -a

        ifup: can't open '/etc/network/interfaces': No such file or directory

    . 解决办法：

        cat /etc/network/interfaces

            # Loopback interface.

            auto lo

            iface lo inet loopback

            # dhcp

            auto eth0

            iface eth0 inet dhcp

            # fixed

            auto eth1

            iface eth1 inet static

                    address 192.168.1.254

                    netmask 255.255.255.0

                    broadcast 192.168.1.255
　　　　　　　　　　　 gateway 192.168.1.1

二、错误处理2：

    . 现象：

        [zengjf@root network]# ifup -a

        run-parts: /etc/network/if-pre-up.d: No such file or directory

        run-parts: /etc/network/if-up.d: No such file or directory

        ifup: can't open '/var/run/ifstate': No such file or directory

        [zengjf@root network]#

    . 解决方法：

        cd /etc/network

        mkdir if-down.d  if-post-down.d  if-pre-up.d  if-up.d

        mkdir /var/run

三、错误处理3：

    . 现象：

        [zengjf@root ]# ifup -a

        ip: RTNETLINK answers: File exists

        udhcpc (v1.24.1) started

        Setting IP address 0.0.0.0 on eth0

        Sending discover...

        Sending discover...

        Sending discover...

        No lease, failing

        ip: can't find device 'eth1'

        ip: SIOCGIFFLAGS: No such device

        [zengjf@root ]#

    . 解决办法：

        cat /etc/network/interfaces

            # Loopback interface.

            auto lo

            iface lo inet loopback

            # dhcp

            auto eth0

            iface eth0 inet dhcp

            # fixed

            #auto eth1

            #iface eth1 inet static

            #        address 192.168.1.254

            #        netmask 255.255.255.0

            #        broadcast 192.168.1.255
            #        gateway 192.168.1.1