飞凌TE2440: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:EthernetHWaddr 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 MULTICASTMTU:1500Metric: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:EthernetHWaddr 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 MULTICASTMTU:1500Metric: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 路由器？这么强大？现在用的路由器就是这么实现的吗？新手学习，帮你顶起！ 好帖 ft.... 还是广告贴啊…… 无任何本质的信息量……
连route命令怎么设置路由都没有写，也就是教了一个如何设置net.ipv4.ip_forward……
如何永久启用也没提……
我建议想了解这方面信息的网友们，先好好在PC机上玩玩看看吧。
一般笔记本都有双网卡(无线网卡和有线网卡)，足够玩这些了，嵌入式上的网络管理与那个无异。 路过，不懂。 有完整版的吗？
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