/********************************************************************** *              BusyBox ifup udhcpc后台运行 * 说明： *     发现ifup会调用udhcpc，但是并不会切换到后台运行，解决一下。 * *                                  2016-10-11 深圳 南山平山村 曾剑锋 *********************************************************************/一、参考文档：    1. How to get BusyBox udhcpc to run in background forever?        https://unix.stackexchange.com/questions/267733/how-to-get-busybox-udhcpc-to-run-in-background-forever二、解决办法：    1. cat /etc/network/interfaces        # interface file auto-generated by buildroot                auto lo        iface lo inet loopback                auto eth0        iface eth0 inet dhcp            udhcpc_opts -b          # <------ 添加udhcpc参数            2. 启动输出信息：        ...        Starting network: eth0: Freescale FEC PHY driver [Generic PHY] (mii_bus:phy_addr=1:01, irq=-1)        udhcpc: started, v1.26.2        udhcpc: sending discover        PHY: 1:01 - Link is Up - 100/Full        udhcpc: sending discover        udhcpc: sending discover        udhcpc: no lease, forking to background        ...