No Network

[Darren]

Guillermo Garron wrote:
> On 1/19/07, Darren <linuxn00b at justcommodores.com.au> wrote:
>   
>> Hi Guys,
>> This afternoon I had to turn off my Ubuntu 6.10 Server, all went well
>> and normal but since booting the machine backup I am unable to see
>> anything on my network and I am unable to connect to any of the services
>> (ssh, samba, squid or apache) from any of the other machines on the network.
>>
>> Networking appears to have started ok, I am able to ping my box's own IP
>> but from the other machines (windows) I get 'Request Timed Out' and
>> pinging out of the network from the linux box comes back as 'Destination
>> Host Unreachable'.
>>
>> I am using static IP's setup as the following in my interfaces file
>>
>> auto eth0
>> iface eth0 inet static
>>        address 172.17.12.1
>>        netmask 255.255.255.0
>>        network 172.17.12.0
>>        broadcast 172.17.12.255
>>        gateway 172.17.12.254
>>        dns-nameservers 203.2.124.164
>>
>> This machine connects to a switch and off to a router which does it's
>> own pppoe connection so in effect this box sits behind a router, all of
>> the other machines on the network are fine.
>>
>> The only clue that I possibly have is it appears to be transmitting data
>> but not receiving anything at all.
>>     
> Maybe a silly question, but are you sure your cable is in good
> condition? (does de leds on the switch and on the NIC are ON?)
>   
I work on a helpdesk so no question is ever silly :) I am positive the 
cable is OK, I just grabbed a cable out of a box and put it between the 
switch and the ubuntu box, both led's light up at either end, just to be 
on the safe side I even placed it into another port and just grabbed the 
cable from a windows machines and repeated that same process.
>> I have just removed iptables to no avail as well.
>>
>> Should you have any idea's that would be great, at this stage
>> screenshots are a touch difficult.
>>     
>
> If you have another PC on the network you can try starting ethereal on
> that PC and ping to it, that way you will find out if your PC is
> transmitting or not.
>
>   
I didn't think of that before, I have just installed ethereal and no 
traffic at all is listed as coming from 172.17.12.1 (ubuntu box)

I tried a tcpdump on eth0 and that made no mention of incoming ping request.

Looking through dmesg it has

'device eth0 entered promiscuous mode'
'audit(series of numbers): dev=eth0 prom=256 old_prom=0 auid=4294967295'

'device eth0 left promiscuous mode'
'audit(series of numbers): dev=eth0 prom=0 old_prom=256 auid=4294967295'

That appears to be repeated 3 or 4 times perhaps even more.
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