[AusNOG] Oddity

[Matthew VK3EVL]

I think I found the netcomm



> On 9 May 2014, at 21:00, Joseph Goldman <joe at apcs.com.au> wrote:
> 
> Wait, when did you turn off the netcomm? I lost internet earlier today, so did the whole world no? Is that netcomm 'the' core router of THE WHOLE INTERNET????!!!1!
> 
> 
> 
>> On 9 May 2014 20:58:35 GMT+10:00, Tim Sheahan <sheahant at mytelecom.com.au> wrote:
>> I think that NB6 must be "the cloud".
>> 
>> Of course their internet went down when you turned it off..
>> 
>>> On 9/05/2014 8:49 PM, Karl Auer wrote:
>>>  This is weird. Or at least, I think it's weird.
>>> 
>>>  Client has a phone tail (J11) coming into a little Netcomm NB6 ADSL2+
>>>  router/modem. The Netcomm is on, and the ADSL light is lit up. The
>>>  Netcomm is not attached by any means to anything else (and is not a
>>>  wireless router). Specifically, there is no Ethernet connection to the
>>>  Netcomm. Just power and an RJ11.
>>> 
>>>  Client has another link to the Internet. I'm not sure what it is, but
>>>  since he can definitely get to the Internet and the Netcomm is not
>>>  locally networked with anything, it seems to me I can be reasonably sure
>>>  it's not the Netcomm, right? Hm. Read on.
>>> 
>>> 
>>> There's a Cisco 800 series router sitting there too; it's showing DSL
>>>  "CD" on, and RX/TX is showing lots of activity. Another RJ11 tail runs
>>>  into the Cisco, and this has an old piece of cardboard tied to it saying
>>>  "New ADSL connection" and a phone number (yes - THAT sort of client).
>>>  I'm guessing that's the Internet connection, but it's only a guess. It
>>>  can't be the Netcomm, so it must be the Cisco, right?
>>> 
>>>  Well, maybe not. The client has a symmetrical DSL link from Telstra to
>>>  an office in another town. Maybe the Cisco is handling that? In which
>>>  case what's handling the Internet connection?
>>> 
>>>  Anyway, none of that is weird, that's just general ignorance. No; what's
>>>  weird is that if I turn off the Netcomm, the client loses Internet
>>>  connectivity. The Cisco's CD light stays on.
>>> 
>>>  About the only explanation I can think of is that somehow the external
>>>  IP address of the Netcomm is involved in routing
>>> traffic to the client.
>>>  I can't imagine how, though. I just can't believe that the Netcomm IS
>>>  the Internet connection - with no Ethernet connected, no PPP light
>>>  showing and (obviously) no Ethernet activity.
>>> 
>>>  I'm not seeking help here, I'm just fascinated by the fact that this
>>>  Netcomm, not networked locally at all, can somehow affect the local
>>>  network's Internet connectivity on (presumably) a completely other ADSL
>>>  link. I didn't think that was possible, but clearly it is.
>>> 
>>>  Obviously I'm about to learn something :-)
>>> 
>>>  Regards, K.
>> 
>> 
>> 
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