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SimonBurley
Beginner
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Message 1 of 8

100 seconds upload causes line drop

A month or so ago, the street suffered some kind of mass line break. Until that point, we'd been enjoying 80Mbit down and 20Mbit up for about a year (since our last issue...) with uptimes of several days at a time.

Once the line was fixed, the speed stabilised fairly quickly at 60Mbit down and 15Mbit up. We can live with this, though not ideal, but we have some unwanted behaviour in that the VDSL connection drops at around 100 seconds of continued upload, every single time.

I've set my Draytek to log to syslog and I see an almost flat SNR of 7 or 8dB and 13db of attenuation right until the line drops:

Aug 6 15:38:26 draytek-2860n DrayTek: ADSL_Status:[Mode=17A States=SHOWTIME UpSpeed=14998000 DownSpeed=59997000 SNR=8 Atten=13 ]
Aug 6 15:38:54 draytek-2860n DrayTek: ADSL_Status:[Mode=17A States=SHOWTIME UpSpeed=14998000 DownSpeed=59997000 SNR=8 Atten=13 ]
Aug 6 15:39:22 draytek-2860n DrayTek: ADSL_Status:[Mode=17A States=SHOWTIME UpSpeed=14998000 DownSpeed=59997000 SNR=8 Atten=13 ]
Aug 6 15:39:32 draytek-2860n DrayTek: PPP Closed : Remote Terminating (PPPoA)
Aug 6 15:39:32 draytek-2860n DrayTek: >>> Dial-up triggered by user : 192.168.1.103 ; proto=UDP, to 8.26.56.26 port=domain
Aug 6 15:39:35 draytek-2860n DrayTek: PPP Start (PPPoA)
Aug 6 15:39:35 draytek-2860n DrayTek: CHAP Login OK (PPPoA)
Aug 6 15:39:35 draytek-2860n DrayTek: IPCP Opening (PPPoA); Own IP Address : 31.53.13.159 Peer IP Address : 172.16.10.58; Primary DNS : 81.139.56.100 Secondary DNS : 81.139.57.100
Aug 6 15:39:50 draytek-2860n DrayTek: ADSL_Status:[Mode=17A States=SHOWTIME UpSpeed=14998000 DownSpeed=59997000 SNR=8 Atten=13 ]
Aug 6 15:40:18 draytek-2860n DrayTek: ADSL_Status:[Mode=17A States=SHOWTIME UpSpeed=14998000 DownSpeed=59997000 SNR=8 Atten=13 ]

 

The line is completely silent on the quiet line test.

 

line.jpg

Does anyone have an idea how to diagnose this further?

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Distinguished Sage
Distinguished Sage
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Message 2 of 8

Re: 100 seconds upload causes line drop

on fibre I would expect it to be PPPoE not PPPoA which is adsl

it looks like all your previous connection problems have left you in a banded profile which should correct itself but most times gets stuck and you need a kind engineer to visit, fix a fault, and then reset DLM



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SimonBurley
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Message 3 of 8

Re: 100 seconds upload causes line drop

Just a little follow-up on the progress.

BT did a DLM reset without an engineer visit last week. The line has been stable (but speed unchanged) until last night when we had a power cut and when the power came back we have gone from 15MBit/s up to 20Mbit/s up. We are still seeing "only" 60Mbit/s down (prior to the really bad line we had 80Mbit/s down)

In the meantime I received a text message from BT stating the "Line Reach rate is BAD".  A quick Google doesn't give much away.

 

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Distinguished Sage
Distinguished Sage
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Message 4 of 8

Re: 100 seconds upload causes line drop

if the banding didn't clear and your speed remained about same the help desk just did a hub reset not a DLM reset

post your router stats



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SimonBurley
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Message 5 of 8

Re: 100 seconds upload causes line drop

dsl.png

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Distinguished Sage
Distinguished Sage
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Message 6 of 8

Re: 100 seconds upload causes line drop

can you post connection stats from draytek

is modem still connecting on PPPoA and not PPPoE which is for fibre



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SimonBurley
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Message 7 of 8

Re: 100 seconds upload causes line drop

As soon as you kindly pointed out the mis-configuration, I changed the config to PPPoE.

Stats before and after the latest line drop - roughly 60 seconds into a large file upload.

Aug 16 13:03:25 draytek-2860n DrayTek: ADSL_Status:[Mode=17A States=SHOWTIME UpSpeed=19999000 DownSpeed=59997000 SNR=8 Atten=13 ]
Aug 16 13:03:53 draytek-2860n DrayTek: ADSL_Status:[Mode=17A States=SHOWTIME UpSpeed=19999000 DownSpeed=59997000 SNR=8 Atten=13 ]
Aug 16 13:04:08 draytek-2860n DrayTek: PPP Closed : Remote Terminating (PPPoE)
Aug 16 13:04:08 draytek-2860n DrayTek: >>> Dial-up triggered by user : 192.168.1.103 ; proto=TCP, to 185.101.14.7 port=-11599
Aug 16 13:04:08 draytek-2860n DrayTek: PPP Start (PPPoE)
Aug 16 13:04:08 draytek-2860n DrayTek: CHAP Login OK (PPPoE)
Aug 16 13:04:08 draytek-2860n DrayTek: IPCP Opening (PPPoE); Own IP Address : 81.155.187.34 Peer IP Address : 172.16.10.58; Primary DNS : 81.139.57.100 Secondary DNS : 81.139.56.100
Aug 16 13:04:20 draytek-2860n DrayTek: ADSL_Status:[Mode=17A States=SHOWTIME UpSpeed=19999000 DownSpeed=59997000 SNR=8 Atten=13 ]
Aug 16 13:04:48 draytek-2860n DrayTek: ADSL_Status:[Mode=17A States=SHOWTIME UpSpeed=19999000 DownSpeed=59997000 SNR=8 Atten=13 ]
Aug 16 13:05:16 draytek-2860n DrayTek: ADSL_Status:[Mode=17A States=SHOWTIME UpSpeed=19999000 DownSpeed=59997000 SNR=8 Atten=13 ]

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SimonBurley
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Message 8 of 8

Re: 100 seconds upload causes line drop

Additionally, I've noticed that when doing a large file upload, there's no downstream bandwidth at all - ie, http requests hang. This is new behaviour since the line damage.

Are there line monitoring packets that could be failing due to very little downstream bandwidth, and since they're failing does the exchange reset the line?

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