[AusNOG] Oddity

[Joseph Goldman]

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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