Unbuntu Edgy cannot access network

Hi

I am complete newbie to Ubuntu so forgive me of this is a no brainer:

I recently installed Edgy and it worked well.
I had a power cut 3 days ago, and on rebooting, the machine could no longer access the network.


The machine is connected by ethernet to an ADSL modem/router, and is configured to use DHCP.
The green light is on the the back of the network card is lit and the cable is secure.


I have tried altering to a static IP address using the network admin tool and then back to DHCP but
it makes no difference.


I have 2 other windows machines on the network and they work fine, so the problem cannot lie with
the router.



I suspect the sudden power down has messed something up but I have no idea where to start looking.


Can anyone help?


Thanks -Adam

On 03/22/2007 11:12 PM, Adam Lipscombe wrote:
> Hi
>
> I am complete newbie to Ubuntu so forgive me of this is a no brainer:
>
> I recently installed Edgy and it worked well.
> I had a power cut 3 days ago, and on rebooting, the machine could no
> longer access the network.
>
>
> The machine is connected by ethernet to an ADSL modem/router, and is
> configured to use DHCP.
> The green light is on the the back of the network card is lit and the
> cable is secure.
>
>
> I have tried altering to a static IP address using the network admin
> tool and then back to DHCP but it makes no difference.
>
>
> I have 2 other windows machines on the network and they work fine, so
> the problem cannot lie with the router.
>
>
>
> I suspect the sudden power down has messed something up but I have no
> idea where to start looking.

1. Ensure that your /etc/network/interfaces is intact.
2. Try to figure out what

# ifconfig ethX

or

# ip addr show ethX

says.

3. Try manually configuring your interface via DHCP with:

# dhclient ethX

4. If the above does not work, try:

# ifconfig ethX ip.add.re.ss netmask net.ma.s.k up
# route add default gw ip.add.re.ss
# ping ip.of.your.gw

Hope that helps!
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