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標題: 飛凌S3C2440開發板路由實驗代碼 [打印本頁]

作者: yanhong 時間: 2010-7-22 13:56
標題: 飛凌S3C2440開發板路由實驗代碼
PS：
本文轉自飛凌嵌入式技術交流群
這個是由群里一些工程師朋友做的小實驗，可以作為參考。
嵌入式Linux簡單路由實驗
本實驗所用硬件平臺為飛凌（www.witech.com.cn）TE2440V2型開發板；該開發板上有兩個網卡芯片，分別為CS8900和DM9000；在linux操作系統（采用2.6.12版本的內核）下兩個網卡對應的設備名分別為eth0和eht1。
本實驗中TE2440V2開發板作為路由器連接兩個局域網：192.168.0.*和192.168.1.*，對應網關分別為192.168.0.3和192.168.1.3。
1. 配置開發板上兩個網卡的IP地址：
# ifconfig eth0 192.168.0.3 up
# ifconfig eth0 192.168.1.3 up
用ifconfig命令查看網卡信息如下：
      # 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. 開啟Linux內核的路由轉發功能（注意1后面有空格）：
#echo 1 >/proc/sys/net/ipv4/ip_forward
可通過如下命令查看路由轉發是否開啟，1為開啟，0為關閉。
# 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，用自動生成的就可以：
# 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. 測試：用兩個局域網內（192.168.0.*、192.168.1.*）的PC機，分別將其默認網關設置為192.168.0.3和192.168.1.3（這里對應路由器的IP地址），然后用ping命令測試。我用的兩個客戶機的IP分別為192.168.0.221和192.168.1.228，測試結果如下：
C:\Documents and Settings\Administrator>ipconfig
Windows IP Configuration
Ethernet adapter 本地連接 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 本地連接 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

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