Slow DNS look up

Glenn · Sep 28, 2008, 13:42:27

Is anyone else suffering from a slow DNS lookup, pages were taking approximately 10 - 15 seconds to appear, I have changed to Open DNS, now they open within a second or 2?

vitriol · Sep 28, 2008, 14:40:29

Using IDNet as primary DNS and Open DNS as secondary, no problems here. Pages loading nice and quick.

Sebby · Sep 28, 2008, 14:41:00

I'm using OpenDNS permanently, so I can't say for sure, but perhaps I'll switch to IDNet's and see what it's like.

Sebby · Sep 28, 2008, 14:43:13

I've just switched to IDNet's DNS', and if anything, it seems much quicker than OpenDNS.

Anyone else?

By the way, I've moved this to IDNet Help.

Philip · Sep 28, 2008, 14:48:05

using IDNet's DNS here, no problems my end.

Steve · Sep 28, 2008, 14:53:14

Performance for me is down all round this pm,(including lookups) not seen anything like this for three weeks now.

Test1 comprises of Best Effort Test: -provides background information.
Your DSL connection rate: 8128 kbps(DOWN-STREAM), 448 kbps(UP-STREAM)
IP profile for your line is - 7150 kbps
Actual IP throughput achieved during the test was - 3472 kbps

bbmaxresult

Rik · Sep 28, 2008, 14:59:04

Speed and DNS fine here.

Sebby · Sep 28, 2008, 15:04:17

Speed is okay here for my profile, too.

Simon · Sep 28, 2008, 15:36:24

Tried a BT test, and getting the socket error message, so it won't complete, but since the last time I did a test, a while ago, my profile has dropped from 4500 to 3000.

Rik · Sep 28, 2008, 15:37:36

What's your sync speed, Simon?

Simon · Sep 28, 2008, 15:42:31

3776. It's been over 5000 before now.

Rik · Sep 28, 2008, 15:43:26

Has your attenuation or noise margin changed?

Simon · Sep 28, 2008, 15:50:16

Haven't a clue, Rik.

DSL Line (Wire Pair):    Line 1 (inner pair)
Protocol:    G.DMT Annex A
Downstream Rate:    3776 kbps
Upstream Rate:    448 kbps
Channel:    Interleaved
Current Noise Margin:    19.0 dB (Downstream) 18.0 dB (Upstream)
Current Attenuation:    35.3 dB (Downstream) 18.5 dB (Upstream)
Current Output Power:    19.6 dBm (Downstream) 12.1 dBm (Upstream)
DSLAM Vendor Information:    Country: {0xB5} Vendor: {TSTC} Specific: {0x00}
PVC Info:    0/38

Rik · Sep 28, 2008, 15:52:54

Your noise margin is 19db, chances are the target has been set to 15db to stabilise the line. You'd need to check at the test socket (you should have an NTE5 master) and see. If it is, the theory goes that it will drop by 3db after a couple of weeks without losing sync, repeating until it reaches 6db again. In practice, this often fails to happen, so it might be worth a word with support once you've checked the test socket results.

Steve · Sep 28, 2008, 15:56:16

Didn't realise that blu-ray was that noisy.

Rik · Sep 28, 2008, 15:56:38

Simon · Sep 28, 2008, 15:57:52

Does wireless / non-wireless make any difference? I can only use the test socket wirelessly. The noise margin has always been high.

Quote from: stevethegas on Sep 28, 2008, 15:56:16
Didn't realise that blu-ray was that noisy.

Haven't got it yet, Steve.

Rik · Sep 28, 2008, 16:00:39

Wireless makes no difference in respect of the sync speed/NM, unless the router's faulty, of course. I'd expect your sync to be at 6-8Mbps for the attenuation, so the noise margin is suggesting that your line is very noisy. By comparison, I have 57db attenuation, but am syncing at 3400.

Sebby · Sep 28, 2008, 16:00:53

Quote from: Simon on Sep 28, 2008, 15:57:52
Does wireless / non-wireless make any difference? I can only use the test socket wirelessly. The noise margin has always been high.

Nope, it won't make a difference for the purpose of looking at the stats.

Simon · Sep 28, 2008, 16:37:12

Well I took the router down to the test socket, removed the face plate, plugged the router in with a filter, powered up the 2700, and not a sausage. Power light stayed red, and nothing else happened, so I don't know what I was doing wrong, but it works fine back indoors, and I can't be arsed to mess about with it. Only good thing is, since the resync, the sync speed seems to have improved:

DSL Line (Wire Pair):    Line 1 (inner pair)
Protocol:    G.DMT Annex A
Downstream Rate:    4864 kbps
Upstream Rate:    448 kbps
Channel:    Interleaved
Current Noise Margin:    15.0 dB (Downstream) 18.0 dB (Upstream)
Current Attenuation:    35.3 dB (Downstream) 18.5 dB (Upstream)
Current Output Power:    19.8 dBm (Downstream) 12.0 dBm (Upstream)
DSLAM Vendor Information:    Country: {0xB5} Vendor: {TSTC} Specific: {0x00}
PVC Info:    0/38

Rik · Sep 28, 2008, 16:40:05

You've synced at a quiet moment, from the look of it, Simon, so you've shed the extra 4db of margin that you had. It's definitely worth a word with support to see if they can do anything to help providing, that is, your connection is normally stable.

Sebby · Sep 28, 2008, 16:44:12

In the meantime, because of the 15dB margin, it's probably fine that you've sync'd at a quiet time as there's plenty of margin.

Simon · Sep 28, 2008, 16:54:24

I still don't understand why it wouldn't fire up downstairs. I'll have a word with support when I can, but I'm not really sure what to be asking them.

Sebby · Sep 28, 2008, 16:57:49

How long did you leave it for downstairs? It takes a while to stop flashing red.

Simon · Sep 28, 2008, 17:05:58

It wasn't flashing, it was just red, Seb. I left it about 3 minutes.

Rik · Sep 28, 2008, 17:07:52

Did you try plugging a phone into the filter? I just wonder whether the socket is properly wired. As to support, if the line is stable, it's a case of asking them whether they can get BT to lower the target margin. BT are not always co-operative, but it's worth a try.

Simon · Sep 28, 2008, 17:25:59

No, I didn't plug a phone in, but I've had another thought. The very first 2700 I had did the same thing - power light on, but otherwise dead. As I didn't want to scramble round the back of the PC, I used the power adapter from that old 2700 for this test, so maybe it's the power adapter that's faulty, and I may have another working 2700.

Rik · Sep 28, 2008, 17:30:12

A distinct possibility.