Ip Address and DL Speed

I wonder if anyone can explain this.
I am at the end of a long old copper run (about 4km).
I use a Billion 7800DXL router as it is the only one that gives any hope of a useable connection.
I am finding that if the router connects via an Ip address in the range 31.50.238.** I get a sub 2Mbts connection but if it picks up an Ip address in the range 86.142.77.** I get about 3.9Mbts. The SNR does not change so it would seem that DLM is not to blame, the line attenuation is steady at 40.5db
I leave the router on all the time and never disconnect. as long as I have what I would term my "normal" download speed. . If for some reason the Ip address changes.(never instigated at my end) and I get a slow Ip I wait 14 days and the disconnect/reconnect and hope to pick up a "good" ip.
This is and has been repeatable over a long time.
Can anyone offer any explanation or advice.
Many thanks

Are you talking about actual sync speeds or speed checker results?

The IP address is set AFTER the sync and so has no bearing on sync rates. There is either a coincidence going on or it is speed tests you are comparing and perhaps the slower IPs are on more congested backhaul - but I don't believe that the IP is causally relevant and would say there is something else going on here.

Ian
In many ways I would agree but it is the repeatibilty over a long time frame (over 1 Year) which i find frustrating.

I don't disagree that you are seeing it - but the IP is set after the sync and so cannot be the cause of that.

Can you post full stats from both the high and low speed events so that we can see what is happening there?

Hi
The best I can do is these speed test Results

Low
http://www.thinkbroadband.com/speedtest/results.html...

High
http://www.thinkbroadband.com/speedtest/results.html...
Regarding any further Stats i am not sur how to do that.
#

It to me sounds like a throughput related issue Unless it's due to some oddity going on with the IP profile? assuming it's BTW based, I can vaguely recall seeing something similar years ago when on the up to 8mb max with Tiscali, that was likely down to them, not buying enough resources from BTW

Pretty clear to me, provider has a big network with multiple routes through it, and if user is on one segment performance is bad, on another its fine.

So nothing to do with connection medium but all to do with how provider is managing its own network elements

Agreed, which is what I was saying in my initial response even before the tests were posted...

In reply to a post by crule:

Hi
The best I can do is these speed test Results

The SNR does not change so it would seem that DLM is not to blame, the line attenuation is steady at 40.5db

The connection speeds, possibly called sync rate or line rate, are normally on the line above those two figures.

All three lines read at the same time would be useful .

Thanks for the suggestions
From The router at the moment on a Normal connection
All on the Downstream side
Output power 19.9dbm
attenuation 40.5db
Attainable rate 4508kbs
Rate 4800 kbs
SNR 14.9 db

Although the router is set to try to attain 6db SNR

Both ip blocks are owned by BT Wholesale.

I guess they should be as BT is my ISP

Which means BT 'Customser Care' - we will test your line / send you another router / send an engineer out, 'if fault at your premises we will charge £135' - repeat, bang head against wall, migrate.

C:\Users\A>tracert -4 bbc.co.uk

Tracing route to bbc.co.uk [212.58.246.78]
over a maximum of 30 hops:

1 12 ms 98 ms 98 ms 192.168.1.254
2 46 ms 45 ms 46 ms lo0.central10.pcn-bng02.plus.net [195.166.130.249]
3 45 ms 46 ms 46 ms 411.be6.pcn-ir02.plus.net [84.93.253.79]
4 46 ms 47 ms 47 ms 195.99.125.140
5 47 ms 47 ms 47 ms peer2-et-1-1-0.redbus.ukcore.bt.net [62.172.103.45]
6 47 ms 46 ms 47 ms 195.99.126.73
7 * * * Request timed out.
8 46 ms 53 ms 48 ms ae0.er02.cwwtf.bbc.co.uk [132.185.254.90]
9 48 ms 48 ms 49 ms 132.185.255.165
10 47 ms 48 ms 48 ms 212.58.246.78

Trace complete.

The above is a tracert for my connection the number 2 hop shows the gateway my router is using, that can change due to resyncs/loss of connection, some gateways suffer from congestion more than others at certain times resulting in poor throughput speeds.

Your downstream attenuation is a lot less than that of my connection so you should get better sync rates and throughput than you seem to get as can be seen from MrSaffons website:-

http://www.coolwebhome.co.uk/calc/index.php#res

The noise margin of 14.9db is high and that is set by the DLM for some reason or other rather than the usual target of 6db, have you had any issues with the line, is the connection stable how long is the Uptime?

As an aside you can always try the Quiet Line Test by dialling 17070 and taking option 2, you shouldn't hear any noise if the line is OK.

Some of my router (PN supplied) line stats:-

Link Information

Uptime: 6 days, 16:35:15
DSL Type: ITU-T G.992.1
Bandwidth (Up/Down) [kbps/kbps]: 448 / 3.552
Data Transferred (Sent/Received) [MB/GB]: 206,08 / 1,86
Output Power (Up/Down) [dBm]: 12,1 / 18,9
Line Attenuation (Up/Down) [dB]: 29,5 / 54,0
SN Margin (Up/Down) [dB]: 16,0 / 7,1
System Vendor ID (Local/Remote): TMMB / ----
Chipset Vendor ID (Local/Remote): BDCM / TSTC

My previous router, an old Netgear DG8834GT, gave a downstream attenuation of 63db, thunder and lightening put paid to the Netgear a couple of weeks ago

I tried a tracert to the beeb not dissimilar to yours.
A quiet line test is fine and no work has been done on the line.
I have a feeling that as was suggested earlier it is a congested back haul with certain ips.
It is almost impossible to explain this to BT/OR I shall just have to live with it.
Thanks for the advice everyone.

In reply to a post by crule:

attenuation 40.5db
Attainable rate 4508kbs
Rate 4800 kbs
SNR 14.9 db

Your line, which is not extremely long, is running slow anyway. You should be getting 8+ Meg Sync.

Looks like you are being banded/capped.

Edited by XRaySpeX (Sat 01-Apr-17 02:20:46)

Are you using Wi-Fi?
I ask because your first hop i.e. the internal IP of your router is rather high.
Your first hop being the internal ip should be very low like the following:

tracert -4 bbc.co.uk

Tracing route to bbc.co.uk [212.58.244.22]
over a maximum of 30 hops:

  1    <1 ms    <1 ms    <1 ms  BTHUB [192.168.2.253]
  2     3 ms     3 ms     3 ms  217.32.x.x
  3    13 ms     3 ms     3 ms  217.32.146.110
  4     4 ms     4 ms     4 ms  217.32.147.202
  5     4 ms     4 ms     4 ms  217.41.168.55
  6     4 ms     4 ms     4 ms  217.41.168.107
  7     9 ms     8 ms     4 ms  109.159.249.108
  8     4 ms     4 ms     4 ms  core3-te0-9-0-14.faraday.ukcore.bt.net [109.159.249.5]
  9     4 ms     4 ms     4 ms  peer1-et-2-3-0.redbus.ukcore.bt.net [62.172.103.39]
 10     4 ms     4 ms     4 ms  195.99.126.101
 11     *        *        *     Request timed out.
 12     *        *        *     Request timed out.
 13     4 ms     4 ms     4 ms  ae0.er01.telhc.bbc.co.uk [132.185.254.109]
 14     6 ms     5 ms     7 ms  132.185.255.148
 15     4 ms     4 ms     4 ms  212.58.244.22

Trace complete.

Or am I missing something?

Paul

I am confused. I only know how to do "tracert from the command prompt and therefore cannot "grab" the result. Can someone tell me how to do it so that the result can be easily posted
Thanks

If you right-click in the command window you get a context menu, which enables you to select and copy the whole window then edit to remove junk parts after pasting, or to mark/select parts of it and copy just those.

@crule
Also if you click the Quote button on Paul's post you will see how he preserves the formatted output, using the "pre" HTML tag wrapper.

Edited by RobertoS (Sat 01-Apr-17 11:21:42)

First of all thanks for the information about the command prompt

Tracing route to bbc.co.uk [212.58.246.78]
over a maximum of 30 hops:

1 11 ms <1 ms <1 ms home.gateway.home.gateway [192.168.1.254]
2 11 ms 11 ms 11 ms 213.1.175.250
3 10 ms 10 ms 11 ms 213.1.175.161
4 18 ms 18 ms 17 ms 213.1.69.42
5 17 ms 18 ms 18 ms 213.120.180.169
6 18 ms 18 ms 18 ms 213.120.179.83
7 17 ms 17 ms 17 ms acc2-xe-0-3-1.sf.21cn-ipp.bt.net [109.159.251.237]
8 25 ms 22 ms 22 ms core1-te-0-13-0-10.ilford.ukcore.bt.net [109.159.251.191]
9 27 ms 25 ms 26 ms peer1-xe4-2-0.redbus.ukcore.bt.net [109.159.255.130]
10 27 ms 29 ms 26 ms 195.99.126.101
11 * * * Request timed out.
12 25 ms 24 ms 25 ms ae0.er01.cwwtf.bbc.co.uk [132.185.254.93]
13 29 ms 25 ms 38 ms 132.185.255.165
14 23 ms 23 ms 23 ms bbc.co.uk [212.58.246.78]

Trace complete.

Here are the results on a 3.8Mbts connection

No the PN Technicolor is wired to the PC, not sure why the 1st hop is like that ...... a bug?

This seems OK though:-

C:\Users\A>tracert -4 192.168.1.254

Tracing route to 192.168.1.254 over a maximum of 30 hops

1 1 ms <1 ms <1 ms 192.168.1.254

The high latency in your earlier post was transient rather than endemic, as it was not reflected in any later hop. Your router must have been quite busy with some other task at the time.

Responding to pings has to be the least important thing a router does. It's only when high readings are continued in all or nearly all later hops there is anything to worry about, as it could indicate congestion at that point.

In reply to a post by RobertoS:

The high latency in your earlier post was transient rather than endemic, as it was not reflected in any later hop. Your router must have been quite busy with some other task at the time.

Responding to pings has to be the least important thing a router does. It's only when high readings are continued in all or nearly all later hops there is anything to worry about, as it could indicate congestion at that point.

I was about the say that

Paul

In reply to a post by RobertoS:

The high latency in your earlier post was transient rather than endemic, as it was not reflected in any later hop. Your router must have been quite busy with some other task at the time.

Responding to pings has to be the least important thing a router does. It's only when high readings are continued in all or nearly all later hops there is anything to worry about, as it could indicate congestion at that point.

Thanks Bob, having had a cup of tea and time to reflect on the matter I was thiking along those lines too

Coffee boosts the energies.

Tea clears the mind .

In reply to a post by RobertoS:

Coffee boosts the energies.

Tea clears the mind .

Only when you raise the little finger while drinking

Paul