飞凌S3C2440开发板路由实验代码

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飞凌S3C2440开发板路由实验代码 [复制链接]

PS：
本文转自 飞凌嵌入式技术交流群

这个是由群里一些工程师朋友做的小实验，可以作为参考。

嵌入式Linux简单路由实验

    本实验所用硬件平台为飞凌（www.witech.com.cn）TE2440V2型开发板；该开发板上有两个网卡芯片，分别为CS8900和DM9000；在linux操作系统（采用2.6.12版本的内核）下两个网卡对应的设备名分别为eth0和eht1。
    本实验中TE2440V2开发板作为路由器连接两个局域网：192.168.0.*和192.168.1.*，对应网关分别为192.168.0.3和192.168.1.3。
1. 配置开发板上两个网卡的IP地址：
# ifconfig eth0 192.168.0.3 up
# ifconfig eth0 192.168.1.3 up       

用ifconfig命令查看网卡信息如下：

        # ifconfig
        eth0      Link encap:Ethernet  HWaddr 00:00:02:50:10:08
                  inet addr:192.168.0.3 Bcast:192.168.0.255
                  Mask:255.255.255.0
                  UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
                  RX packets:33310 errors:0 dropped:0 overruns:0 frame:0
                  TX packets:5437 errors:55 dropped:0 overruns:25 carrier:5
                  collisions:798 txqueuelen:1000
                  RX bytes:6283109 (5.9 MiB)  TX bytes:3796550 (3.6 MiB)
                  Interrupt:53 Base address:0x300
       
        eth1      Link encap:Ethernet  HWaddr 00:12:34:56:80:49
                  inet addr:192.168.1.3 Bcast:192.168.1.255
                  Mask:255.255.255.0
                  UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
                  RX packets:38618 errors:0 dropped:0 overruns:0 frame:0
                  TX packets:2997 errors:0 dropped:0 overruns:0 carrier:0
                  collisions:0 txqueuelen:1000
                  RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
                  Interrupt:51 Base address:0x8300

2. 开启Linux内核的路由转发功能（注意1后面有空格）：

#echo 1 >/proc/sys/net/ipv4/ip_forward       

可通过如下命令查看路由转发是否开启，1为开启，0为关闭。

# sysctl net.ipv4.ip_forward
net.ipv4.ip_forward = 1
# more /proc/sys/net/ipv4/ip_forward
1       

路由表不用配置，用自动生成的就可以：

# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.1.0     *               255.255.255.0   U     0      0        0 eth1
192.168.0.0     *               255.255.255.0   U     0      0        0 eth0       

3. 测试：用两个局域网内（192.168.0.*、192.168.1.*）的PC机，分别将其默认网关设置为192.168.0.3和192.168.1.3（这里对应路由器的IP地址），然后用ping命令测试。我用的两个客户机的IP分别为192.168.0.221和192.168.1.228，测试结果如下：

C:\Documents and Settings\Administrator>ipconfig

Windows IP Configuration

Ethernet adapter 本地连接 5:

        Connection-specific DNS Suffix  . :
        IP Address. . . . . . . . . . . . : 192.168.1.228
        Subnet Mask . . . . . . . . . . . : 255.255.255.0
        Default Gateway . . . . . . . . . : 192.168.1.3

C:\Documents and Settings\Administrator>ping 192.168.0.221 -l 65500

Pinging 192.168.0.221 with 65500 bytes of data:

Reply from 192.168.0.221: bytes=65500 time=298ms TTL=63
Reply from 192.168.0.221: bytes=65500 time=244ms TTL=63
Reply from 192.168.0.221: bytes=65500 time=230ms TTL=63
Reply from 192.168.0.221: bytes=65500 time=257ms TTL=63

Ping statistics for 192.168.0.221:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 230ms, Maximum = 298ms, Average = 257ms

C:\Documents and Settings\Administrator>ipconfig

Windows IP Configuration

Ethernet adapter 本地连接 3:

        Connection-specific DNS Suffix  . :
        IP Address. . . . . . . . . . . . : 192.168.0.221
        Subnet Mask . . . . . . . . . . . : 255.255.255.0
        Default Gateway . . . . . . . . . : 192.168.0.3

C:\Documents and Settings\Administrator>ping 192.168.1.228 -l 65500

Pinging 192.168.1.228 with 65500 bytes of data:

Reply from 192.168.1.228: bytes=65500 time=240ms TTL=127
Reply from 192.168.1.228: bytes=65500 time=263ms TTL=127
Reply from 192.168.1.228: bytes=65500 time=226ms TTL=127
Reply from 192.168.1.228: bytes=65500 time=282ms TTL=127

Ping statistics for 192.168.1.228:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
        Minimum = 226ms, Maximum = 282ms, Average = 252ms

yanhong_90

飞凌嵌入式：www.witech.com.cn