Wireshark mailing list archives
Re: Using Wireshark for a DSL "link no surf" problem [UPDATE]
From: Kok-Yong Tan <ktan () realityartisans com>
Date: Mon, 07 Jul 2014 20:06:22 -0400
Yes, well, the ZyXEL P660R-F1 and the Broadxent/Innoband Briteport don't. If they did, I wouldn't have had any problems connecting up in the first place. That's why I'm looking for a method/software/hardware that would detect what the existing VPI/VCI is on the wire besides just knowing what it was set to.
From what I gathered in reading "End-to-End DSL Architectures" by Wayne C. Vermillion, VPI is the Virtual Path Identifier and VCI is the Virtual Circuit Identifier. Also, for each ATM physical link, there are 256 possible VPIs and within each VP are 65,536 possible VCIs (less identifier numbers 0-31 which are reserved). This means that there are a humongous number of possible valid values of VPI/VCI (256 * 65,504 by my calculation) to cycle through if one takes the brute force approach. And even if one were to chance upon the correct set of values, how does one verify that it's the intended one?
On 7/6/14 23:42, Frank Bulk (iname.com) wrote:
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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Current thread:
- Re: Using Wireshark for a DSL "link no surf" problem [UPDATE] Kok-Yong Tan (Jul 02)
- Re: Using Wireshark for a DSL "link no surf" problem [UPDATE] Guy Harris (Jul 02)
- Re: Using Wireshark for a DSL "link no surf" problem [UPDATE] Kok-Yong Tan (Jul 02)
- Re: Using Wireshark for a DSL "link no surf" problem [UPDATE] Frank Bulk (iname.com) (Jul 06)
- Re: Using Wireshark for a DSL "link no surf" problem [UPDATE] Kok-Yong Tan (Jul 07)
- Re: Using Wireshark for a DSL "link no surf" problem [UPDATE] Frank Bulk (iname.com) (Jul 11)
- Re: Using Wireshark for a DSL "link no surf" problem [UPDATE] Kok-Yong Tan (Jul 11)
- Re: Using Wireshark for a DSL "link no surf" problem [UPDATE] Pedro Tumusok (Jul 11)
- Re: Using Wireshark for a DSL "link no surf" problem [UPDATE] Kok-Yong Tan (Jul 02)
- Re: Using Wireshark for a DSL "link no surf" problem [UPDATE] Guy Harris (Jul 02)