- 配置內核:
[*] Networking support --->
Networking options --->
<*> Packet socket
<*> Unix domain sockets
[*] TCP/IP networking
[*] IP: kernel level autoconfiguration
[*] IP: DHCP support
[*] Network packet filtering framework (Netfilter) --->
- 配置busybox:
Networking Utilities --->
[*] udhcp client (udhcpc)
3.建立配置文件:
從busybox的examples/udhcp/下copy simple.script文件到開發板/usr/share/udhcpc/下,並重命名爲default.script
4. 測試:
在命令臺執行udhcpc,注意:必須確保局域網內存在DHCP服務器,否則udhcp執行失敗。
在easy2440上面執行結果如下:
[root@liebao:/usr/share/udhcpc]#udhcpc
udhcpc: started, v1.28.1
Setting IP address 0.0.0.0 on eth0
udhcpc: sending discover
udhcpc: sending select for 172.16.21.230
udhcpc: lease of 172.16.21.230 obtained, lease time 86400
Setting IP address 172.16.21.230 on eth0
Deleting routers
route: SIOCDELRT: No such process
Adding router 172.16.21.254
Recreating /etc/resolv.conf
Adding DNS server 202.106.0.20
ifconfig查看:
[root@liebao:/usr/share/udhcpc]#ifconfig
eth0 Link encap:Ethernet HWaddr 00:0A:2D:A6:55:A2
inet addr:172.16.21.230 Bcast:172.16.21.255 Mask:255.255.255.0
inet6 addr: fe80::20a:2dff:fea6:55a2/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:231 errors:0 dropped:35 overruns:0 frame:0
TX packets:82 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:31511 (30.7 KiB) TX bytes:9144 (8.9 KiB)
Interrupt:106 Base address:0xc000
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)
ping百度測試一下:
[root@liebao:/usr/share/udhcpc]#ping www.baidu.com -c4
PING www.baidu.com (61.135.169.121): 56 data bytes
64 bytes from 61.135.169.121: seq=0 ttl=55 time=2.871 ms
64 bytes from 61.135.169.121: seq=1 ttl=55 time=2.593 ms
64 bytes from 61.135.169.121: seq=2 ttl=55 time=2.416 ms
64 bytes from 61.135.169.121: seq=3 ttl=55 time=2.447 ms
--- www.baidu.com ping statistics ---
4 packets transmitted, 4 packets received, 0% packet loss
round-trip min/avg/max = 2.416/2.581/2.871 ms
可以ping通說明自動配置成功!
5. 修改系統初始化配置文件,讓開發板開機後自動獲取IP地址:
修改/etc/init.d/rcS文件在適當位置添加命令: /sbin/udhcpc &