The first thing to check is to see if the NIC card is
showing up. Without the hardware being checked
and confirmed to be running then checking other
things is not productive.
Check ifconfig and see if there are 2 entries, one for
lo and one for eth0 or wlan0 or something in that range.
Is this a wireless or wired connection?
Please post the NIC card name,make and model number.
Bigpaws
I wrote in termanal ifconfig:
-when the connection is up:
root:# ifconfig
eth0 Link encap:Ethernet HWaddr 00:13:8F:4E:6E:49
inet addr:172.16.10.252 Bcast:172.16.15.255 Mask:255.255.240.0
UP BROADCAST NOTRAILERS RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1614 errors:0 dropped:0 overruns:0 frame:0
TX packets:268 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:192052 (187.5 KiB) TX bytes:22748 (22.2 KiB)
Interrupt:23 Base address:0x6c00
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 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:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
ppp0 Link encap:Point-to-Point Protocol
inet addr:79.116.210.200 P-t-P:86.125.87.60 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1492 Metric:1
RX packets:8 errors:0 dropped:0 overruns:0 frame:0
TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:149 (149.0 b) TX bytes:45 (45.0 b)
-when the conection is down:
root:# ifconfig
eth0 Link encap:Ethernet HWaddr 00:13:8F:4E:6E:49
inet addr:172.16.10.252 Bcast:172.16.15.255 Mask:255.255.240.0
UP BROADCAST NOTRAILERS RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3130 errors:0 dropped:0 overruns:0 frame:0
TX packets:1139 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:327995 (320.3 KiB) TX bytes:70721 (69.0 KiB)
Interrupt:23 Base address:0x6c00
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 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:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
root:# ping www.google.com
ping: unknown host www.google.com