Well after much brain scratching port mirroring wire sniffing etc.

The power definitely isn't an issue.

And the ADSL is a combined router modem, ADSL public IP, LAN side private
IP, and its the adsl connection on the wan port thats dropped.

It dawned on me the other network we tested this PC on is 100Mb and its
home netowrk is Gb

Set the switch port and card to 100Mb full duplex instead of autodetect and
I can power it off and on without the ADSL being affected.

set it back to gig and on the windows login screen appearing the ADSL
switches off and comes back in a few seconds/minutes.

Now prior to this mornings testing we had treid 2 diefferent Netgear ADSL
Routers and a Zyxell and the same issue occured.

Again when on gig networking there is no errors on the wire, no packet
storms, no unusual traffic nothing reported anywhere apart from internet
access failed till the ADSL resets.

So that PC is getting left at 100Mb just now.

Graeme







On 9 July 2013 13:58, Jonathan Kadoo <[email protected]> wrote:

> Does the adsl have an interface to the internal network?  If so could it
> be that the pc and adsl have same ip?
>
>
> On Tue, Jul 9, 2013 at 5:22 AM, Graeme Carstairs <[email protected]>wrote:
>
>> Hi
>>>
>> We have a client with SBS essentials 2011
>>
>> A smart switch and a Adsl broadband
>>
>> They are having intermittent issues with their broadband the provider is
>> looking into.
>>
>> The bizarre issue is one pc when it is switched on just as the Ctrl alt
>> del appears the Adsl goes down for a few minutes then starts up
>>
>> Checked the pc no viruses/Trojans etc
>>
>> The nic isn't spewing traffic
>>
>> The switch shows no errors
>>
>> I've tried the pc on a different network with no issues
>>
>> Tried different cables and ports
>>
>> And just now dropped the speed of the nic to 100MB
>>
>> but there are no errors other than the Adsl dropping
>>
>> It doesn't help that it drops occasionally when the pcs not there
>>
>> But it happens every time the pc is switched on
>>
>> Any suggestions
>>
>> Graeme
>>
>>
>>
>>
>> --
>> Good news everyone, you have just received an e-mail from me!
>>
>
>


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