If "ifconfig eth0" returns " ERROR while getting interface flags: No such
device" then your NIC is probably bad as Darrin described.
If you instead get something like:
eth1 Link encap:Ethernet HWaddr 00:19:DE:07:BB:AA
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:82374 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:1728 (1.6 KiB)
Interrupt:17 Base address:0xc000 Memory:dcfff000-dcffffff
Then I'm guessing your DHCP server has crapped out. If it is your FW/Router,
simply power cycling it my solve the situation. If not, try adding a static
IP and bringing the device up.
vi /etc/network/interfaces
change the line from
iface eth0 inet dhcp
to
iface eth0 inet static
address 192.168.1.20 <-- adjust this as appropriate for your network
gateway 192.168.1.1
netmask 255.255.255.0
and then do /etc/init.d/networking restart
or
ifconfig eth0 down
ifconfig eth0 up
and then see if you have connectivity. If not, my money is on a bad cable or
swtich port.
Cheers.
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