[Gllug] ADSL Puzzle

[Ken Smith]

Jason Clifford wrote:
> On Thu, 5 Jul 2007, Ken Smith wrote:
>
>   
>> Its a Zyxel P660. Yes it has native Ping, but without the PPPoA actually 
>> established I don't think ping helps all that much as the router hasn't 
>> even got an IP address. The authentication never really completes so the 
>> PPPoA never comes up.
>>     
>
> OK, assuming you are using an ISP that is not LLU based try the following:
>
> To check the BT network configuration change the Routers ADSL/PPP login 
> details to the following:
>
> Username: bt_test at startup_domain
> Password: 123
>
> If that works the problem will either be the BT mapping for your account 
> not going to the correct ISP or the ISP RADIUS platform being 
> misconfigured.
>
> Jason
>   
Thanks for that suggestion Jason, I've just tried that. I would assume 
that the PPPoA should have come up and the router get an IP address 
assigned. Well that didn't happen.

So either the existing router is shot or there is some other fault. I 
tried another router yesterday and it didn't get much further, so I 
doubt it's a router fault.

Is there a failure mode where the link level ATM side of things can be 
working but the ATM traffic is lost? I'm not sure how this works, but is 
it the DSLAM that terminates the the link layer at the end of the sub's 
line and strips off the ATM packets, deals with the PPP authentication 
(<--or does something else do this bit) and routes the traffic to the 
correct ISP? I seem to recall that there is another step in there - but 
anyway - is there a failure mode in BT/ISP's kit that can give these 
symptoms -> Link level established but no trace of authentication happening?

Thanks

Ken





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