How do i know whether my NIC works or not?

[Joep L. Blom]

arshad wrote:
> On Mon, 2009-12-28 at 20:14 +0100, Christian Schult wrote:
>> Hello arshad,
>>
>> arshad wrote:
>>
>>> $ ifconfig 
>>> eth0      Link encap:Ethernet  HWaddr 00:e0:4d:af:6e:4f  
>>>           UP BROADCAST MULTICAST  MTU:1500  Metric:1
>>>           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>>>           TX packets:0 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:252 Base address:0x8000 
>>>
>>> lo        Link encap:Local Loopback  
>>>           inet addr:127.0.0.1  Mask:255.0.0.0
>>>           inet6 addr: ::1/128 Scope:Host
>>>           UP LOOPBACK RUNNING  MTU:16436  Metric:1
>>>           RX packets:2037 errors:0 dropped:0 overruns:0 frame:0
>>>           TX packets:2037 errors:0 dropped:0 overruns:0 carrier:0
>>>           collisions:0 txqueuelen:0 
>>>           RX bytes:1049382 (1.0 MB)  TX bytes:1049382 (1.0 MB)
>>>
>>> ppp0      Link encap:Point-to-Point Protocol  
>>>           inet addr:10.200.216.210  P-t-P:10.64.64.64
>>> Mask:255.255.255.255
>>>           UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
>>>           RX packets:5205 errors:0 dropped:0 overruns:0 frame:0
>>>           TX packets:5124 errors:0 dropped:0 overruns:0 carrier:0
>>>           collisions:0 txqueuelen:3 
>>>           RX bytes:4945403 (4.9 MB)  TX bytes:767624 (767.6 KB)
>>>
>>> usb0      Link encap:Ethernet  HWaddr 02:80:37:14:03:00  
>>>           inet6 addr: fe80::80:37ff:fe14:300/64 Scope:Link
>>>           UP BROADCAST MULTICAST  MTU:1500  Metric:1
>>>           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>>>           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>>>           collisions:0 txqueuelen:1000 
>>>           RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
>>>
>>> and i don't know how to find the dhcp server :( (very sorry)
>> Ok, we also need the output of
>>
>> $ cat /etc/network/interfaces | grep -v "^#"
>>
>> This will print the content of the file /etc/network/interfaces but with
>> no comments. Copy that output into your answer.
>>
>> Then please do
>>
>> $ route -n
>>
>> and also send us the output.
>>
>> What's that ppp0 device and usb0 device? Is it your mobile phone and
>> your router connected via USB? Pull them out, configure network manager
>> (that GUI you posted the screenshot of) to use eth0 automatically and
>> with dhcp server located at 192.168.1.1, then restart your computer and
>> see if you get connected. Else show again output of /sbin/ifconfig and
>> route -n.
>>
>>
>> Christian
>>
> 
> Hello Christian,
> yes usb0 device is my mobile phone. and after pulling it out, i can't
> select eth0 as the radio button is not active and also if i don't plug
> the mobile phone the name of the eth0 is not shown; i mean, if i plug
> the mobile the wirednetwork is shown along with its name - Biostar
> Microtech Int'l....
> 
> another thing,
> today i took the machine to the service center, there with their router
> internet is working. but with my router its not working. but my router
> works with my friens machine. what kind of mystery is this?....
> 
> and here are the output for commands you put above:
> thank you very much
> 
> $ cat /etc/network/interfaces | grep -v "^#"
> auto lo
> iface lo inet loopback
> 
> 
> $ route -n
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags Metric Ref    Use
> Iface
> 
> 
> $ /sbin/ifconfig
> eth0      Link encap:Ethernet  HWaddr 00:e0:4d:af:6e:4f  
>           UP BROADCAST MULTICAST  MTU:1500  Metric:1
>           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:0 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:252 Base address:0xc000 
> 
> lo        Link encap:Local Loopback  
>           inet addr:127.0.0.1  Mask:255.0.0.0
>           inet6 addr: ::1/128 Scope:Host
>           UP LOOPBACK RUNNING  MTU:16436  Metric:1
>           RX packets:20 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:20 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0 
>           RX bytes:1472 (1.4 KB)  TX bytes:1472 (1.4 KB)
> 
> 
> 
Arshad,
The output shows that you don't have an IP address for eth0, not even 
the standard address given by the standard network tools.
Either you don't have a DHCP server or your system cannot see it.
I suggest > http://www.linuxhomenetworking.com/
and look especially to:
#   Introduction to Networking
# Linux Networking
# Simple Network Troubleshooting

Also the rest is valuable to study carefully.
Success,
Joep