Wireshark · Wireshark-users: Re: [Wireshark-users] Using Wireshark for a DSL "link no surf" problem

[Kok-Yong Tan <ktan@xxxxxxxxxxxxxxxxxxx>]

No, the DSL modem is bridging, not routing.  I've been assigned two static IPs (although they've given me a /24 net mask!!!) and my firewall is assigned one of them.  The firewall is connected directly to the DSL modem by Cat6 patch cable.  The other IP is unused (I use it for testing VPN configurations).

I'm not sure but since the Broadxent Briteport is a PPPoE modem, I assume PPPoE.  But the tech says that's not correct (WTF?).  And he can't explain what they use.  Sigh.

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On Jun 17, 2014, at 22:13 , Pedro Tumusok <pedro.tumusok@xxxxxxxxx> wrote:

Well if the tech can see stuff, its not what I thought might be the problem, which was PVC settings.

But does your modem get an IP address, ie is it setup as a router or does your computer get the ip address?

Are you using PPPoA/PPPoE etc?

On Wed, Jun 18, 2014 at 5:52 AM, Frank Bulk <frnkblk@xxxxxxxxx> wrote:

Some Comtrend modems can do a port mirror of the WAN (DSL) side.

Frank

-----Original Message-----
From: wireshark-users-bounces@xxxxxxxxxxxxx
[mailto:wireshark-users-bounces@xxxxxxxxxxxxx] On Behalf Of Kok-Yong Tan
Sent: Tuesday, June 17, 2014 4:53 PM
To: Community support list for Wireshark
Subject: Re: [Wireshark-users] Using Wireshark for a DSL "link no surf"
problem


> On Jun 17, 2014, at 14:28, Jaap Keuter <jaap.keuter@xxxxxxxxx> wrote:
>
>> On 06/17/2014 08:42 PM, Kok-Yong Tan wrote:
>> Is it possible to use Wireshark to troubleshoot a DSL "link no surf"
problem?  The ISP insists it's a CPE issue but the problem only started
after their Tier 1 tech monkeyed with the DSLAM and/or the CPE (remotely) in
some manner.  I find it suspicious that the problem was intermittent packet
loss until they tinkered, whereupon the problem became a "link no surf"
issue (i.e., there's Layer 2 connectivity but zero Layer 3 traffic passing).
>
> Depends on what you can trace in the CPE, as in, how close to the DSL
interface.
> Otherwise you'll need capture hardware on the DSL....
>
> Good luck,
> Jaap
>

I can get up to the DSL modem itself.  In hindsight, I'm thinking this isn't
going to be of much use and the only way to debug this is with capture
hardware on the DSL side as you suggested.  Drat.
--
Sent from my iPad2 with greater chance of typographical, grammatical and
other disasters.  Your indulgence is even more humbly requested.

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--
Best regards / Mvh
Jan Pedro Tumusok

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