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joe123

Strange internet problem

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My internet has been running very slowly lately and I'm having a strange problem when performing a download speed test.  During the 2992 kb download, the progress bar goes quickly up to about 32%, then stalls for 5 - 10 seconds, goes quickly to about 85%, stalls again, and then goes quickly to 100%.  I've tried multiple TCP parameter configurations using Cablenut and TCP Optimizer but to no avail.  The downstream power level on my modem (SB5120) was at 11 dBmV, and I thought this might be too high so I added two splitters and now the power level is at 2 dBmV, however, this didn't fix the problem at all.  I'm not sure what is going on here and would be grateful for any suggestions.  Thanks.

:::.. Download Stats ..:::

Download Connection is:: 884 Kbps about 0.88 Mbps (tested with 2992 kB)

Download Speed is:: 108 kB/s

Tested From:: https://testmy.net/ (Server 2)

Test Time:: 2006/06/23 - 8:52am

Bottom Line:: 15X faster than 56K 1MB Download in 9.48 sec

Tested from a 2992 kB file and took 27.718 seconds to complete

Download Diagnosis:: May need help : running at only 22.84 % of your hosts average (insightbb.com)

D-Validation Link:: https://testmy.net/stats/id-D35V8SHTG

User Agent:: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1) [!]

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joe123,Welcome to the forum.

I have a WebSTAR DPC2100r2

Receive Power Level   -9.6 dBmV

Transmit Power Level  34.3 dBmV

I get great speed from Insightbb. This is a Dual Test

:::.. testmy.net test results ..:::

Download Connection is:: 4527 Kbps about 4.53 Mbps (tested with 5983 kB)

Download Speed is:: 553 kB/s

Upload Connection is:: 367 Kbps about 0.37 Mbps (tested with 748 kB)

Upload Speed is:: 45 kB/s

Tested From:: https://testmy.net (Server 1)

Test Time:: 2006/06/23 - 7:12am

D-Validation Link:: https://testmy.net/stats/id-HFM4EI3GU

U-Validation Link:: https://testmy.net/stats/id-RGM8VO647

User Agent:: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; Maxthon; .NET CLR 1.1.4322) [!]

Here is a screen shot of my cablenut settings for a 4000/384

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Have you checked for ad-ware or viruses? Also did you reboot your computer after the new settings? Your Levels seem a little high to me. You might want to call Insight and get someone out to look at the set up. I had speed issues a long time ago they sent someone out and ended replacing my drop line to the house. Also replaced my RCA modem for the Webstar and I have not had problens since.

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My computer is clean...and I restarted each time after changing settings.  My internet is very "bursty" when downloading large files.  I don't know a whole lot about TCP/IP but it's almost as if the computer is requesting too much data at once, so there's a huge initial burst of data but then it falls on its face trying to keep up and packets are getting lost / timing out or something like that.  Do you know if there's a good program I could use to try to analyze TCP packets and attempt to figure out what's going on?

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coknuck ;Thats what it should do.Now try it with a larger amount like 1474 it should defragment.

The amount 1472 is 1500 for the MTU minus 28 for the headers.This should mean a MTU of 1500 works for your connection .So a MSS of 1460 is correct too.

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It looks like you are set for DSL.I thought your would fragment at 1472 & need to use 1464 not to fragment.

It looks like that is what your OS did the second time .That means you have the correct MTU & MSS for your connection.

So your command looked like this    ping -f -l 1464 testmy.net    ?

If you want the larger rwin in Cablenut to work you need to have scaling turned on.The 64240 should be the unscaled rwin.

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This is what I get:

C:Documents and SettingsLisa>ping -f -l testmy.net 1472

Pinging 0.0.5.192 with 0 bytes of data:

Request timed out.

Request timed out.

Request timed out.

Request timed out.

Ping statistics for 0.0.5.192:

   Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

C:Documents and SettingsLisa>ping -f -l testmy.net 1500

Pinging 0.0.5.220 with 0 bytes of data:

Request timed out.

Request timed out.

Request timed out.

Request timed out.

Ping statistics for 0.0.5.220:

   Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

C:Documents and SettingsLisa>ping testmy.net

Pinging testmy.net [67.18.179.85] with 32 bytes of data:

Reply from 67.18.179.85: bytes=32 time=43ms TTL=51

Reply from 67.18.179.85: bytes=32 time=43ms TTL=51

Reply from 67.18.179.85: bytes=32 time=43ms TTL=51

Reply from 67.18.179.85: bytes=32 time=43ms TTL=51

Ping statistics for 67.18.179.85:

   Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

   Minimum = 43ms, Maximum = 43ms, Average = 43ms

Edit: New  prompt:

Pinging testmy.net [67.18.179.85] with 1464 bytes of data:

Reply from 67.18.179.85: bytes=1464 time=48ms TTL=51

Reply from 67.18.179.85: bytes=1464 time=49ms TTL=51

Reply from 67.18.179.85: bytes=1464 time=48ms TTL=51

Reply from 67.18.179.85: bytes=1464 time=46ms TTL=51

Ping statistics for 67.18.179.85:

    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

    Minimum = 46ms, Maximum = 49ms, Average = 47ms

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coknuck :This is what is says when the MTU is too high:

C:WINDOWS>ping testmy.net -f -l 1500

Pinging testmy.net [67.18.179.85] with 1500 bytes

Packet needs to be fragmented but DF set.

Packet needs to be fragmented but DF set.

Packet needs to be fragmented but DF set.

Packet needs to be fragmented but DF set.

Ping statistics for 67.18.179.85:

    Packets: Sent = 4, Received = 0, Lost = 4 (10

Approximate round trip times in milli-seconds:

    Minimum = 0ms, Maximum =  0ms, Average =  0ms

At least this is my OS response.On yours when you use the MTU in the command you get this:

Pinging 0.0.5.220 with 0 bytes of data:

I get this: Pinging testmy.net [67.18.179.85] with 1500 bytes thats with the too large MTU but it shows I'm pinging with 1500 & testmy address .

This is a list of ping commands I get by just typing ping.

C:WINDOWS>ping

Usage: ping [-t] [-a] [-n count] [-l size] [-f] [-i TTL] [-v TOS]

            [-r count] [-s count] [[-j host-list] | [-k host-list]]

            [-w timeout] destination-list

Options:

    -t            Ping the specified host until stopped.

                  To see statistics and continue - type Control-Br

                  To stop - type Control-C.

    -a            Resolve addresses to hostnames.

    -n count      Number of echo requests to send.

    -l size        Send buffer size.

    -f            Set Don't Fragment flag in packet.

    -i TTL        Time To Live.

    -v TOS        Type Of Service.

    -r count      Record route for count hops.

    -s count      Timestamp for count hops.

    -j host-list  Loose source route along host-list.

    -k host-list  Strict source route along host-list.

    -w timeout    Timeout in milliseconds to wait for each reply.

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Umm well I don't know what it does but I do know Comcast ran new lines to the pole near my house and to my house itself. And replaced something up there that the line between my house and that pole connects to. Kinda like a big box! But anyway I see you have dsl I shoulda payed more attention. With DSL service I have no idea. I know before I got comcast I had earthlink DSL and everytime I got a phone call it would knock my connection out. And they set up a voice and data box seperately and I still got the problem. They never figured it out so I went to comcast.

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FGOKURULES;It's like ballista  said it is the phone service line between the pole & house.This would include the DSL line if you have DSL. It got the name drop when all lines were in air.Now many are underground instead.Your electric service lines are also called drops.

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