Have you tried to manually lock down the dsl operating mode? I.e don't let it autodetect

Int atm0
Dsl operating-mode itu

From: Terry Wilson <terry@pds-dn.co.nz>
To: nznog@list.waikato.ac.nz <nznog@list.waikato.ac.nz>
Sent: Thu Mar 26 09:55:05 2009
Subject: Re: [nznog] VF / Ihug issues with Cisco ADSL Routers

Problem doesn’t go away if I shutdown and bring up interfaces. Not sure if its ADSL2+ related for us as the 827/837s that have shown this behaviour aren’t ADSL2 capable.  Virtual interface comes up ok and I can ping the outside world no problem, can connect in via VPN and incoming email works ok (as long as it doesn’t time out) and web works occasionally.

 

I have also tried with the newer adsl firmware from ftp://ftp.cisco.com/pub/access/800 with no success.

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