When I startup the system(debain lenny) few days before,a notice shows that 
there's no network device found,in the form of an icon at the rigth bottom of 
my KDE desktop,but when I run "ifconfig","eth0" is showed:
eth0  Link encap:Ethernet HWaddr ********
      inet addr:*** Bcast:*** Mask:*** 
      inet6 addr: fe80:***:348/64 Scope:Link
      UP BROADCAST MULTICAST  MTU:1500 Metric:1
      RX packets:829 errors:0 dropped:0 overruns:0 frame:0
      TX packets:99 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:1000
      RX bytes:49923 (48.7KiB) TX bytes:12927 (12.6KiB)
      interrupt:249
dmesg | grep eth" also shows:
eth0:RTL8168b/8111b at *******
Driver 'sd' needs updating - please use bus_type methods
r8169:eth0:link up
r8169:eth0:link up
eth0:no IPv6 routers present
r8169:eddth0:link down
 
>From the start menu,I tried to use network configuration tool to set my 
>IP:filled in the blanks and applied and changed cards and when changed back,I 
>could just see the previous settings!
Then tried to edit /etc/network/interfaces ,still,nothing happened.
 
What should I do then?
    Is there any solution?
    Is there any more information needed?

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