Re: Using Wireshark for a DSL "link no surf" problem [UPDATE]

["Frank Bulk \(iname.com\)" <frnkblk () iname com>]

Some DSL modems do have an auto-detect where they cycle through the most
common VPI/VCI values.

Frank

-----Original Message-----
From: wireshark-users-bounces () wireshark org
[mailto:wireshark-users-bounces () wireshark org] On Behalf Of Kok-Yong Tan
Sent: Wednesday, July 02, 2014 7:09 PM
To: Guy Harris; Community support list for Wireshark
Subject: Re: [Wireshark-users] Using Wireshark for a DSL "link no surf"
problem [UPDATE]

On 7/2/14 19:31, Guy Harris wrote:
> On Jul 2, 2014, at 3:46 PM, Kok-Yong Tan <ktan () realityartisans com>
> wrote:
>
> > This segues to my next question:  Is there any way to use Wireshark
> > to ascertain the VPI/VCI of the ATM circuit from the Layer 2
> > packets that were said to have been flowing?  Or must I have
> > specialized software or hardware to do this?
>
> If you're capturing on the Ethernet into the modem, I wouldn't expect
> to see any ATM information from the capture - if, for example, the
> modem has an HTTP-based configuration interface for use on the local
> user side, Ethernet traffic to and from its Web server won't even
> necessarily go out over the DSL circuit.
>
> To capture traffic on the ATM side of the modem, you'd need
> specialized hardware, and probably some level of specialized software
> to talk to that hardware.
>
> > I noticed that the rep had nothing more than his laptop connected
> > via ethernet cable to the DSL modem when he noticed the different
> > VPI/VCI settings on a possibly in-house-only software running on
> > it.
>
> According to the manual for your modem at the URL you sent in an
> earlier message, there's an HTTP-based configuration interface.
> That's probably what the rep was using.

Okay, noted on the ATM info.  Thanks.

Unfortunately, he wasn't using that HTTP-based interface (I looked at 
what he was looking at and it's not the Broadxent Briteport's 
interface).  The Broadxent Briteport's web-based interface is just a 
status interface.  There's nothing that can be set on it except for the 
PPPoE settings and there's also a reset-to-defaults button.  All through 
the case when I was offline, it just displayed a VPI/VCI of 0/35.  I 
suspect that there is another port which allows an admin user to login 
and manipulate the settings, just like on the replacement ZyXEL P660R-F1 
the onsite tech provided me with.


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