[AusNOG] Oddity

[Nathan Brookfield]

Well played!

Kindest Regards,
Nathan Brookfield

Chief Executive Officer
Simtronic Technologies Pty Ltd

Web: http://simtronic.com.au
Phone: 1300 592 330
Fax: (02) 4749 4950

On 9 May 2014, at 21:49, "Matthew VK3EVL" <hitman at itglowz.com<mailto:hitman at itglowz.com>> wrote:

I think I found the netcomm

<image.jpeg>

On 9 May 2014, at 21:00, Joseph Goldman <joe at apcs.com.au<mailto: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<mailto: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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