Trying to improve ping but no success so far

Limite · Post by **Limite** » Tue May 31, 2011 3:13 pm

Hi, I've been trying to improve my ping times lately but haven't had much success so far. I've only been able to get shave off ~1 ms in general with the config below, which is good but maybe there's more that can be done about it.

My network speed is usually ~3.75Mbit [down] / ~0.60Mbit(max) - ~0.30Mbit(min) [up] depending on the day, hour, server, etc..
my config is

« SpeedGuide.net TCP Analyzer Results »
Tested on: 05.31.2011 14:57
IP address: 85.55.xxx.xx
Client OS: Windows XP

TCP options string: 020405500103030001010402
MSS: 1360
MTU: 1400
TCP Window: 32640 (multiple of MSS)
RWIN Scaling: 0 bits
Unscaled RWIN : 65280
Recommended RWINs: 65280, 130560, 261120, 522240, 1044480
BDP limit (200ms): 1306kbps (163KBytes/s)
BDP limit (500ms): 522kbps (65KBytes/s)
MTU Discovery: ON
TTL: 46
Timestamps: OFF
SACKs: ON
IP ToS: 00000000 (0)

In addition to trying several configs, I've also done several tracerts and found a hop (the second) which is always present and adds a lot of latency but I don't know to who it belongs to, I thought it was a server that belonged to my ISP but the IP's of the servers from my isp usually start with 62...

Code: Select all

C:\Documents and Settings\Administrator>tracert google.com

Tracing route to google.com [209.85.227.104]
over a maximum of 30 hops:

  1    <1 ms    <1 ms    <1 ms  192.168.0.1       router
[color="#ff0000"] [B] 2    40 ms    39 ms    39 ms  172.31.255.254   ??????[/B][/color]
  3    39 ms    40 ms    39 ms  62.36.169.142     ISP
  4    43 ms    43 ms    44 ms  62.36.202.238     ISP
  5    50 ms    45 ms    48 ms  62.36.187.77       ISP
  6    45 ms    45 ms    55 ms  81.52.179.201     etc..
  7    90 ms    60 ms    61 ms  xe-4-0-1-0.auvtr3.Aubervilliers.opentransit.net
[193.251.132.177]
  8    86 ms    86 ms    85 ms  google-3.GW.opentransit.net [193.251.254.98]
  9    66 ms    66 ms   103 ms  209.85.250.142
 10    66 ms    66 ms    70 ms  216.239.43.233
 11    74 ms    75 ms    71 ms  216.239.49.45
 12    74 ms    87 ms    68 ms  209.85.243.89
 13    72 ms    67 ms    66 ms  wy-in-f104.1e100.net [209.85.227.104]

Trace complete.

trogers · Post by **trogers** » Tue May 31, 2011 7:19 pm

Log into your router to check if connection is interleaved DSL.

If so, ping times at hop 2 are correct. Only non-interleaved signals give ping times below 20ms at the modem.

Limite · Post by **Limite** » Wed Jun 01, 2011 7:43 am

Yes, the channel mode is set to interleaved which is the only mode my ISP supports right now unfortunately. So I guess the only solution is to get another ISP that offers other channel modes, right?

trogers · Post by **trogers** » Wed Jun 01, 2011 7:56 am

Limite wrote:Yes, the channel mode is set to interleaved which is the only mode my ISP supports right now unfortunately. So I guess the only solution is to get another ISP that offers other channel modes, right?

Interleaved signals are employed in areas where the phone lines are rather old, to reduce signal errors.

If the phone lines in your neighborhood is in such a state, other providers will probably also need to run their system on interleaved mode.

Limite · Post by **Limite** » Wed Jun 01, 2011 10:29 am

trogers wrote:Interleaved signals are employed in areas where the phone lines are rather old, to reduce signal errors.

If the phone lines in your neighborhood is in such a state, other providers will probably also need to run their system on interleaved mode.

I live in a city where some providers offer a fastpath mode so I guess the phone lines are in good state. Maybe my current ISP doesn't want to use other channel modes to reduce cost or something.