Mark Rogers mark@quarella.co.uk wrote:
Sorry, another OT post on an ADSL subject - if anyone has some suggestions of decent technical ADSL lists or forums please let me know.
ISP forums, router forums, http://www.ispreview.co.uk/talk/ http://www.thinkbroadband.com/ http://www.broadband-help.com/forums/
One of our customers migrated from one ISP to another, from a reasonable
Both BT-based or Local Loop Unbundled? Which ISPs?
[...]
I need to find someone who has seen something similar and has some sensible suggestions as to what to try next. (Is the fault likely at BT or the ISP?)
I think I've had similar problems at one step during my sequence of http://mjray.ukgovoss.org/2009/10/05/betting-on-british-broadband-bugfixing/ problems with an Opal-based LLU service, but it was rare compared to the others. I'd put a Linux-based router in there (yay back on topic) and get decent debugging information out of it to see where to point the finger. Look at the ADSL negotiation, the various line stats (SNR, attenuation, and so on) and watch the PPP negotiations by starting pppd from the commandline with the debug option or sending it a USR1 signal (which toggles the debug option) soon after start.
Good luck!