busybox udhcpc配置使用及DHCP移植

最新推荐文章于 2024-03-15 09:17:14 发布

原创最新推荐文章于 2024-03-15 09:17:14 发布 · 6.1k 阅读

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本文介绍了如何使用busybox的udhcpc工具自动分配IP，并解决自动获取IP后未设置网卡IP的问题。通过复制并修改examples/udhcp/simple.script为default.script，然后执行udhcpc命令，成功设置IP地址并更新了路由器和DNS信息。

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1.通过busybox udhcpc工具自动分配ip，并设置网卡IP.

问题描述：
输入命令 udhcpc eth0,能够自动获取到ip地址，但是通过ifconfig查询设备的ip地址时，发现没有设置网卡IP.具体情况如下所示。
[root@funchip ~]# udhcpc eth0
udhcpc: started, v1.30.1
udhcpc: sending discover
udhcpc: sending select for 172.16.0.181
udhcpc: lease of 172.16.0.181 obtained, lease time 604800
[root@funchip ~]# ifconfig
eth0 Link encap:Ethernet HWaddr 08:90:90:90:90:90
inet addr:172.16.0.86 Bcast:172.16.255.255 Mask:255.255.0.0
inet6 addr: 240e:fe:3006:6053:a90:90ff:fe90:9090/64 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:4511 errors:0 dropped:2329 overruns:0 frame:0
TX packets:23 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:526580 (514.2 KiB) TX bytes:4044 (3.9 KiB)

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

解决办法：
将busybox中examples/udhcp/simple.script 拷贝至根文件系统/usr/share/udhcpc,并重命名为default.script. [root@funchip ~]# cp /home/funchip/default.script /usr/share/udhcpc/
[root@funchip ~]# chmod 755 /usr/share/udhcpc/default.script
[root@funchip ~]# udhcpc eth0
udhcpc: started, v1.30.1
Setting IP address 0.0.0.0 on eth0
udhcpc: sending discover
udhcpc: sending select for 172.16.0.181
udhcpc: lease of 172.16.0.181 obtained, lease time 604800
Setting IP address 172.16.0.181 on eth0
Deleting routers
route: SIOCDELRT: No such process
Adding router 172.16.0.1
Recreating /etc/resolv.conf
Adding DNS server 172.16.0.1
[root@funchip ~]# ifconfig
eth0 Link encap:Ethernet HWaddr 08:90:90:90:90:90
inet addr:172.16.0.181 Bcast:172.16.0.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:472 errors:0 dropped:300 overruns:0 frame:0
TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:51716 (50.5 KiB) TX bytes:2366 (2.3 KiB)