rt3070芯片动态获取IP地址———station模式

上一篇介绍到rt3070芯片station模式手动设置IP地址ping外网，这样显得有些麻烦，如果我们能自动获取IP地址去ping外网不是会更加智能化么？

1.要支持动态获取ip的话，你需要在linux内核中和制作文件系统的busybox的menuconfig选中必要的选项

一： 内核部分

Networking --->

Networking support

Networking options --->

Packet socket //添加.配置CONFIG_PACKET

[ * ] IP: DHCP support //添加

[ * ] Network packet filtering (replaces ipchains)

二：busybox部分

[*]udhcp server(udhcpd)

[*]udhcp client(udhcpc)都选上

udhcpd就是终端设备作为DHCP服务器 ；udhcpc就是终端设备作为DHCP客户端

Networking Utilities --->

[*] udhcp client for DHCPv6 (udhcpc6)

[*] udhcp server (udhcpd) //生成udhcpc命令

make

sudo make install

三：从Busybox的examples/udhcp/下将 simple.script文件tftp到开发板/usr/share/udhcpc/下，并重命名为default.script，然后更改文件default.script的权限

chmod a+x default.script

2.接着，连接WiFi：

>: wpa_supplicant -Dwext -iwlan0 -c wpa_supplicant.conf &

>: phy0 -> rt2x00mac_conf_tx: Info - Configured TX queue 0 - CWmin: 2, CWmax: 3, Aifs: 2, TXop: 47.

phy0 -> rt2x00mac_conf_tx: Info - Configured TX queue 1 - CWmin: 3, CWmax: 4, Aifs: 2, TXop: 94.

phy0 -> rt2x00mac_conf_tx: Info - Configured TX queue 2 - CWmin: 4, CWmax: 10, Aifs: 3, TXop: 0.

phy0 -> rt2x00mac_conf_tx: Info - Configured TX queue 3 - CWmin: 4, CWmax: 10, Aifs: 7, TXop: 0.

Trying to associate with d4:ee:07:22:6b:5c (SSID='HiWiFi_LingYun' freq=2417 MHz)

phy0 -> rt2x00mac_conf_tx: Info - Configured TX queue 2 - CWmin: 7, CWmax: 10, Aifs: 3, TXop: 0.

phy0 -> rt2x00mac_conf_tx: Info - Configured TX queue 3 - CWmin: 4, CWmax: 10, Aifs: 7, TXop: 0.

phy0 -> rt2x00mac_conf_tx: Info - Configured TX queue 1 - CWmin: 3, CWmax: 4, Aifs: 2, TXop: 94.

phy0 -> rt2x00mac_conf_tx: Info - Configured TX queue 0 - CWmin: 2, CWmax: 3, Aifs: 2, TXop: 47.

Associated with d4:ee:07:22:6b:5c

WPA: Key negotiation completed with d4:ee:07:22:6b:5c [PTK=CCMP GTK=CCMP]

CTRL-EVENT-CONNECTED - Connection to d4:ee:07:22:6b:

3.动态获取IP地址：

>: udhcpc -i wlan0

udhcpc (v1.20.2) started

Setting IP address 0.0.0.0 on wlan0

Sending discover...

Sending discover...

Sending select for 192.168.199.245...

Lease of 192.168.199.245 obtained, lease time 43200

Setting IP address 192.168.199.245 on wlan0

Deleting routers

route: SIOCDELRT: No such process

Adding router 192.168.199.1

Recreating /etc/resolv.conf

Adding DNS server 192.168.199.15c completed (auth) [id=0 id_str=]

>: ping 4.2.2.2

PING 4.2.2.2 (4.2.2.2): 56 data bytes

64 bytes from 4.2.2.2: seq=0 ttl=41 time=485.113 ms

64 bytes from 4.2.2.2: seq=1 ttl=41 time=405.201 ms

--- 4.2.2.2 ping statistics ---

>: ping 8.8.8.8

PING 8.8.8.8 (8.8.8.8): 56 data bytes

64 bytes from 8.8.8.8: seq=0 ttl=39 time=93.176 ms

64 bytes from 8.8.8.8: seq=1 ttl=39 time=95.413 ms

--- 8.8.8.8 ping statistics ---

4.查看相关网关信息

>: route

Kernel IP routing table

Destination Gateway Genmask Flags Metric Ref Use Iface

default Hiwifi.lan 0.0.0.0 UG 0 0 0 wlan0

192.168.1.0 * 255.255.255.0 U 0 0 0 eth0

192.168.199.0 * 255.255.255.0 U 0 0 0 wlan0

现在，让来说说可能会遇到的错误：

1.在执行udhcpc命令时

# udhcpc -f

udhcpc (v1.13.2) started

eth0: link up, 100Mbps, full-duplex, lpa 0x41E1

udhcpc: socket: Address family not supported by protocol

其原因可能是因为在内核 make menuconfig选项设置没选 Packet socket, [ * ] Network packet filtering (replaces ipchains) --->选项

2.在接连你的wifi主机后执行

>: udhcpc -i wlan0

udhcpc (v1.20.2) started

Sending discover...

Sending select for 192.168.199.245...

Lease of 192.168.199.245 obtained, lease time 43200

其原因可能是没有在开发板上修改 default.script 的权限，或者没有将 default.script 放到你的开发板 /usr/share/udhcpc/ 路径下。