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Author Topic: on fast path feels like interleaved  (Read 59553 times)

usermac

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Re: on fast path feels like interleaved
« Reply #15 on: February 16, 2015, 03:09:08 PM »

ping 185.16.86.18 I am getting about 30-35.
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boost

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Re: on fast path feels like interleaved
« Reply #16 on: February 16, 2015, 04:21:51 PM »

If I am right FTTC does not allow you to be on fast path so the fact are pings are similar makes me think the interleaved is on but some how it is not reporting it.

To be blunt, no :)

He is interleaved (without a doubt). You are fastpath (without a doubt). The problem appears to be well beyond your house/router, based on what you've posted so far.

With that other stuff you posted, disable any UPNP/port forwarding, WAN management access and turn off the logging that reports it. Every IP on the planet is getting scanned for something, logging/reporting it is a waste of your resources :)
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kitz

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Re: on fast path feels like interleaved
« Reply #17 on: February 16, 2015, 11:03:02 PM »

Although usermacs ping is high, I'd certainly assume that he is on FAST path,

1) That's what his router is reporting.  FAST path is not capable of transmitting interleaved data.
Basically there are 2 different bearer channels down which data can be transmitted (FAST or Interleaved). The interleaved channel is capable of simulating fast but not vice versa.
2) He is syncing at a full 8128 on G.992.1 (g.DMT) .   Usually interleaved adsl1 connections sync at 7616. 
There are some exceptions to this ie account type is adslmax but the EU is attached to an adsl2+ capable MSAN.
3) Interleaving only occurs between the modem and DSLAM.  The modem contains an interleaver/de interleaver, as does the DSLAM/MSAN.   

----


FTTC always uses the Interleaved Path for data transmission.  However, interleaved depth=1 is the equivalent of Fast Path as data is sent contigously without any chopping up and re-arranging of the data stream.

Im on FTTC with an Interleaved depth of 1
 

I'm also up in the NW, so you'd expect my latency to be slightly higher than someone living near to London. That said Im now on an MSE bRAS which is supposed to shave a 1or2ms from latency due to MSE bRAS's being nearer to local exchanges and can hop onto the core quicker whilst there are only a limited number of the old style bRAS's dotted around the UK.

Faster speed doesnt mean that you will get less latency.  Latency is the measure of how long it takes a single packet to get from A -> B.  The higher speeds dont decrease latency, you are just able to send more packets at once.

Over the years Ive been on 512k, 2Mb, 8Mb, 24Mb and 80Mb and its always taken me circa 14ms to get to London.  Its only since my exchange moved to MSE bRAS last Oct that my latency to London reduced to 12/13ms.


----

My trace to 185.16.86.18 is in this post and as you can see its 12ms.


Another thought occurred - what about BT Fon
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usermac

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Re: on fast path feels like interleaved
« Reply #18 on: February 17, 2015, 09:17:12 PM »

I have opted out of BT FON but it is still showing it has been at least 48 hours.

 3. Firmware version:   Software version 4.7.5.1.83.8.130.1.17 (Type A) Last updated 04/05/14

9. BT FON:   Yes

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NewtronStar

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Re: on fast path feels like interleaved
« Reply #19 on: February 17, 2015, 10:47:10 PM »

Just make sure you have entered the email address and password correctly and select opt out.
https://www.bt.com/wifi/secure/index.do?s_cid=con_FURL_btfon
and keep checking the router for BT FON: NO
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WWWombat

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Re: on fast path feels like interleaved
« Reply #20 on: February 18, 2015, 01:11:50 PM »

I have a recollection that BT (Retail) routes are duplicated, but that some of the routing chosen are a bit strange - in particular, I've seen some people on the south coast (Portsmouth or Southampton, IIRC) who sometimes route via Sheffield, then back down to London.

The routing seems to be established when PPP authenticates, and stays fixed thereafter. A disconnection & re-connection (at PPP level) might induce a swap.

I could be *totally* wrong on this though - I don't recall enough to add any more details.

@kitz - when you did a ping back to the OP's exchange, I don't think you got the IP right - it looks like you mixed up the last 2 digits from 2 separate lines in the OP's traceroute.

I *think* the traceroute you needed was to 213.1.174.250, not 213.1.175.250

But, If I'm right at the top, then your packets may not end up routing in the same way.
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usermac

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Re: on fast path feels like interleaved
« Reply #21 on: February 19, 2015, 02:24:15 PM »

The FON is now off, Still ping around 30 during the day and 40 in the evening. I seem to remember being routed through faraday exchange before when I used to have pings around 15. I guess there is nothing I can do. Unless I restart the hub but it had an SNR reset 7 days ago which makes me think I should leave it alone. 

3. Firmware version:   Software version 4.7.5.1.83.8.130.1.17 (Type A) Last updated 04/05/14
4. Board version:   BT Hub 4A
5. ADSL uptime:   7 days, 03:43:08
6. Bandwidth:   448 / 8128
7. Data sent/received:   1.5 GB / 757.4 MB
8. Broadband username:   bthomehub@btbroadband.com
9. BT FON:   No
10. 2.4 GHz Wireless network/SSID:   macs
11. 2.4 GHz Wireless connections:   Enabled (802.11 b/g/n (Recommended)) 20 MHz, WPS disabled
12. 2.4 GHz Wireless security:   WPA and WPA2
13. 2.4 GHz Wireless channel:   6
14. 5 GHz Wireless network/SSID:   macs
15. 5 GHz Wireless connections:   Enabled (802.11 n 40 MHz (Recommended)) 20/40 MHz, WPS disabled
16. 5 GHz Wireless security:   WPA2
17. 5 GHz Wireless channel:   36
18. Firewall:   Default
19. MAC Address:   cc:33:bb:ac:ae:ec
20. VPI/VCI:   0 / 38
21. Modulation:   G.992.1 Annex A
22. Latency type:   Fast
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usermac

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Re: on fast path feels like interleaved
« Reply #22 on: February 19, 2015, 02:38:17 PM »

I found an older trace.
Tracing route to 185.16.86.18 over a maximum of 30 hops

  1    <1 ms    <1 ms     1 ms  BThomehub.home [192.168.1.254]
  2    16 ms    15 ms    17 ms  esr6.faraday2.broadband.bt.net [217.47.45.145]
  3    17 ms    16 ms    17 ms  217.47.45.30
  4    19 ms    19 ms    19 ms  213.1.69.86
  5    17 ms    19 ms    19 ms  217.41.168.102
  6    16 ms    18 ms    19 ms  217.41.168.149
  7    17 ms    16 ms    17 ms  217.41.168.107
  8    17 ms    19 ms    18 ms  109.159.249.110
  9    19 ms    17 ms    17 ms  core4-te-0-12-0-19.faraday.ukcore.bt.net [109.15
9.249.21]
 10    18 ms    17 ms    18 ms  peer5-te0-0-0-1.telehouse.ukcore.bt.net [194.72.
31.89]
 11    18 ms    20 ms    22 ms  xe-0-2-4.rt0.thn.bandwidth.co.uk [195.66.225.123
]
 12    18 ms    19 ms    18 ms  xe-1-1-2.rt0.cr.bandwidth.co.uk [5.226.136.42]
 13    18 ms    19 ms    17 ms  10ge-xe-0-1-1.ldn.uk.fragnet.net [217.146.92.6]

 14    17 ms    17 ms    17 ms  185.16.86.18
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boost

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Re: on fast path feels like interleaved
« Reply #23 on: February 19, 2015, 04:48:31 PM »

Code: [Select]
1    <1 ms    <1 ms    <1 ms  BThomehub.home [192.168.1.254]
2     9 ms     9 ms     8 ms  213.1.174.250  [Device?]
3     8 ms     8 ms     8 ms  213.1.175.145  [Device?]
4    17 ms    17 ms    16 ms  213.1.69.122   [WHAT DEVICE IS THIS?! Double latency my ass! :) ]


If we had to have a wild stab in the dark as to what these devices are, what do we reckon? Is hop 4 going via a latency crippling tunnel of some sort?

Or, perhaps, is it going back on itself, somehow? The ping literally doubles...
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usermac

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Re: on fast path feels like interleaved
« Reply #24 on: February 19, 2015, 06:04:07 PM »

I do not know what those devices are I only have my pc connected as far as I know? I as guessing they are something to do with BT.
« Last Edit: February 19, 2015, 06:09:15 PM by usermac »
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d2d4j

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Re: on fast path feels like interleaved
« Reply #25 on: February 20, 2015, 08:51:59 AM »

Hi

If you ping faraday ip, you should have similar ping times matching your last post ping times. However, your no longer routed through it.

I would be more interested to know why your outgoing is so much higher then your incoming.

Are you running any services which account for this.

If not, you may want to look at what's using bandwidth on outgoing

Many thanks

John
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boost

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Re: on fast path feels like interleaved
« Reply #26 on: February 20, 2015, 09:34:10 AM »

I do not know what those devices are I only have my pc connected as far as I know? I as guessing they are something to do with BT.

Who knows. Is it worth posting another trace route? Are those pings consistent?
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d2d4j

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Re: on fast path feels like interleaved
« Reply #27 on: February 20, 2015, 09:45:27 AM »

Hi boost

I would consider user mac would have similar ping timings unless the routing changes, but I don't think the routes at that level can be manipulated by user mac

User mac initial post was a gaming issues, ie game does not feel right

To qualify the gaming route matrix, use eMac would need the results for a ping from game server back to user mac ip, ideally a vector trace, but this would not include any game server balancing of latency between players in game. This is where the light switch cheat makes a difference.

I suspect it is the bandwidth usage for outgoing which is causing the issue, in that it may perhaps be packet loss, which trace route would not show fully.

I hope that helps and sorry if I'm wrong

Many thanks

John
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usermac

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Re: on fast path feels like interleaved
« Reply #28 on: February 20, 2015, 08:01:54 PM »

Microsoft Windows [Version 6.3.9600]
(c) 2013 Microsoft Corporation. All rights reserved.



Tracing route to 185.16.86.18 over a maximum of 30 hops

  1     1 ms    <1 ms    <1 ms  BThomehub.home [192.168.1.254]
  2     9 ms    10 ms    12 ms  213.1.174.250
  3     8 ms    10 ms     7 ms  213.1.175.145
  4    20 ms    19 ms    22 ms  213.1.69.122
  5    23 ms    23 ms    24 ms  217.41.169.219
  6    24 ms    24 ms    23 ms  217.41.169.109
  7    23 ms    22 ms    22 ms  acc2-xe-7-2-0.sf.21cn-ipp.bt.net [109.159.251.23
3]
  8    30 ms    31 ms    31 ms  core2-te-0-13-0-10.ealing.ukcore.bt.net [109.159
.251.179]
  9    28 ms    29 ms    28 ms  peer3-te0-7-0-0.telehouse.ukcore.bt.net [62.172.
102.5]
 10    28 ms    30 ms    30 ms  xe-0-2-4.rt0.thn.bandwidth.co.uk [195.66.225.123
]
 11    28 ms    29 ms    30 ms  xe-1-1-2.rt0.cr.bandwidth.co.uk [5.226.136.42]
 12    33 ms    31 ms    31 ms  10ge-xe-0-1-1.ldn.uk.fragnet.net [217.146.92.6]

 13    31 ms    31 ms    30 ms  185.16.86.18

Trace complete.

Tracing route to 185.16.86.18 over a maximum of 30 hops

  1    <1 ms    <1 ms     1 ms  BThomehub.home [192.168.1.254]
  2     9 ms    10 ms    12 ms  213.1.174.250
  3     9 ms    12 ms     9 ms  213.1.175.145
  4    21 ms    22 ms    20 ms  213.1.69.122
  5    20 ms    21 ms    21 ms  217.41.169.219
  6    21 ms    21 ms    21 ms  217.41.169.109
  7    22 ms    22 ms    21 ms  acc2-xe-7-2-0.sf.21cn-ipp.bt.net [109.159.251.23
3]
  8    31 ms    31 ms    30 ms  core2-te-0-13-0-10.ealing.ukcore.bt.net [109.159
.251.179]
  9    28 ms    26 ms    28 ms  peer3-te0-7-0-0.telehouse.ukcore.bt.net [62.172.
102.5]
 10    27 ms    27 ms    27 ms  xe-0-2-4.rt0.thn.bandwidth.co.uk [195.66.225.123
]
 11    31 ms    29 ms    29 ms  xe-1-1-2.rt0.cr.bandwidth.co.uk [5.226.136.42]
 12    31 ms    34 ms    32 ms  10ge-xe-0-1-1.ldn.uk.fragnet.net [217.146.92.6]

 13    30 ms    31 ms    30 ms  185.16.86.18

Trace complete.
« Last Edit: February 20, 2015, 09:58:04 PM by usermac »
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boost

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Re: on fast path feels like interleaved
« Reply #29 on: March 06, 2015, 07:22:49 PM »

Did this sort itself out by any chance or still ongoing?
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