Hispanic
join:2000-01-22
Hoboken, NJ
1 edit | Nighttime slowdown again
I'm experiencing slow down again. This has been happening almost every night around this time. It seems to occur between 10pm and 1am or so. My uploads are unaffected but my downloads are as low as 5 to 6mbps. It is odd that it seems to always occur around this time. Is it overcrowding?
 |
|
HD_Ride
Premium
join:2000-10-18
Trenton, NJ
 ·VoicePulse
 ·Verizon FIOS
| Have you done any testing? maybe give Verizon Fiber Optics Line Monitors a try or get yourself a copy of pingplotter, it may find something, then again may not.... |
|
Hispanic
join:2000-01-22
Hoboken, NJ | reply to Hispanic
No, I haven't had a chance to call tech support so they can test. However, I am experiencing the same slow down again during this time frame. It is very strange. The rest of the day I get full download speeds. |
|
deblin
Dark Side of the Moon
Premium,MVM
join:2001-09-01
Middletown, DE
| reply to Hispanic
said by Hispanic  : Is it overcrowding? Given your upstream seems to be running fine and that the upstream on the BPON/GPON is lower than what's available on the downstream, I doubt it's a case of congestion. If it were, I'd expect your upstream to be affected just as much. Why? Because if the downstream were saturated on the *PON, you'd have a situation similar to what happens with ACKs being queued on the downstream side when your upload is saturated. In other words, your downstream would be limiting your upstream. But that's not the case, based on your speed tests...
I'd definitely give verizon support a call and/or post in the direct forum to see what's going on.
--
He who is not contented with what he has, would not be contented with what he would like to have. -Socrates |
|
Hispanic
join:2000-01-22
Hoboken, NJ | I just got off the phone with a Verizon Fios tech. They checked my line and said everything was fine. They mentioned that there shouldn't be any bandwidth issues in my neighborhood. So it is a mystery now. I guess i will keep monitoring. |
|
N O Y B
St. John 3.16
join:2005-12-15
Forest Grove, OR
| reply to deblin
But in speed tests aren't the upload and download performed at different times? So one should not have any impact on the other? So to verify what you are saying both a download and upload would need to be done simultaneously, wouldn't it? Or maybe I just didn't comprehend what you said?
--
Be a Good Netizen - Read, Know & Complain About Overly Restrictive Tyrannical ISP ToS & AUP »comcast.net/terms/ »verizon.net/policies/
Say Thanks with a Tool Points Donation |
|
More Fiber
Premium,MVM
join:2005-09-26
West Chester, PA
 ·Bay Area Internet ..
| said by N O Y B :But in speed tests aren't the upload and download performed at different times? So one should not have any impact on the other? Yes, the download and upload tests are performed separately. That is not what deblin was talking about.
For each block that is transferred (up or down), there is an ACK that flows in the opposite direction. If there is congestion in the direction the ACKs are flowing, the ACKs are queued and not sent as quickly as possible. This throttles the sender until the ACK is received. There is more involved, but that's the general idea.
What deblin was trying to point out was that since the OP's upstream tests were good, downstream ACKs are not being delayed, and therefore downstream congestion is not an issue. |
|
N O Y B
St. John 3.16
join:2005-12-15
Forest Grove, OR
| said by More Fiber :said by N O Y B : ...since the OP's upstream tests were good, downstream ACKs are not being delayed, and therefore downstream congestion is not an issue.
The downstream ACKs require/consume very little bandwidth. Far less than the downstream throughput the OPer is getting, so of course down stream ACKs are unlikely to be impacted enough to cause upstream slowness.
I'm inclined to think maybe the OPer has something running unaware. Or maybe if the OPer has FiOS TV the STB is doing something weird. Also if this is with WiFi a whole host of things could be in play.
Another thing that is interesting is the 0 ms ping in one test and then 10 ms ping in the next.
--
Be a Good Netizen - Read, Know & Complain About Overly Restrictive Tyrannical ISP ToS & AUP »comcast.net/terms/ »verizon.net/policies/
Say Thanks with a Tool Points Donation |
|
Hispanic
join:2000-01-22
Hoboken, NJ | reply to Hispanic
Well now it is around 7:11pm and i'm getting bad slowdown on the downstream side again. It doesn't make sense to me.. can anyone figure this out?
 |
|
deblin
Dark Side of the Moon
Premium,MVM
join:2001-09-01
Middletown, DE
| said by Hispanic :Well now it is around 7:11pm and i'm getting bad slowdown on the downstream side again. It doesn't make sense to me.. can anyone figure this out? I take it you've tried unplugging ALL internet-connected devices during these times and testing individually from each connection while the rest are off to rule out some sort of malware phoning home at this time or something?
The next logical step for me would be to run wireshark or similar and collect a packet capture while you're downloading from the ftp1.optonline.net FTP server and posting up the pcap dump from that so we can take a look and see if the connection looks like it's congested or if there are dup ACKs, retransmissions or what.
--
He who is not contented with what he has, would not be contented with what he would like to have. -Socrates |
|
kdwycha
join:2003-01-30
Riverview, FL | reply to Hispanic
You tried any other speed test sites? Maybe those two you always use are slammed during this time period. Notice you use the NJ and the NYC one. Maybe try washington or atlanta or something? |
|
Hispanic
join:2000-01-22
Hoboken, NJ | Yea, I try different speed test options. I use nyc.speakeasy.net and I also download a 1gig file straight from optimum online's server at ftp1.optonline.net. I also try downloading a file from a newsgroup where I usually get full bandwidth. |
|
Hispanic
join:2000-01-22
Hoboken, NJ
1 edit | reply to deblin
My ONT is connected to my router via a 50feet cat 6 ethernet. I even tried taking my router right next to the ont and connecting with 5 feet of cat 5e and I would try just connecting my laptop wired to the router and still experience the same slow down during random times.
I guess my next step is to download the wireshark and do the test you mentioned. |
|
deblin
Dark Side of the Moon
Premium,MVM
join:2001-09-01
Middletown, DE | Wait, were all your tests performed with the laptop? Have you tried a different machine (if available)? |
|
Hispanic
join:2000-01-22
Hoboken, NJ
| I meant to say that that I normally have multiple devices connected to my router. I have two hard wired pc's on gigabit connection. Another desktop via wireless n.. my ps3 and xbox360 via hard wired connection and my laptop via wireless n. When I get the slow down, I switch off to the other pcs and do testing as well. I even turn off all pcs's but one and still the same slowdown. During this time, I even tried removing all pc's and connecting my router right near the ont. I then take my laptop over because it is easier and I do testing as well.. still the same result. |
|
deblin
Dark Side of the Moon
Premium,MVM
join:2001-09-01
Middletown, DE
| Ok, I just wanted to rule out something weird going on with an individual PC.
And you did say that multiple different speed test sites also show the same slow downs, right?
One other useful bit of information would be whether this is a digital transition or analog.
What I mean by that is: Does the connection go from 20 Mbit to 9Mbit at nearly the flip of a switch, or does it slowly degrade from 20 down to 9 over the course of an hour or two/etc?
--
He who is not contented with what he has, would not be contented with what he would like to have. -Socrates |
|
Hispanic
join:2000-01-22
Hoboken, NJ
| Well I have a nasty habit of running a speedtest whenever I use my computer. Most of the time I get 24 to 25 down and 22 to 24 up. But during the slow down, the speed tests would just download as low at 3 to 8 down.. and then after retesting it would be 14 to 15 down. When I try to download from ftp1.optonoline.net, it just starts slow and stays slow. It doesn't start fast and slow down.
I downloaded and installed wireshark but i'm not sure how to use it. How can I capture while downloading from ftp1.optonline.net? |
|
deblin
Dark Side of the Moon
Premium,MVM
join:2001-09-01
Middletown, DE
| Once you get wireshark opened, in the filter expression area, put:
ip.addr == 167.206.5.41
Then click apply.
Then you should be able to click on the capture menu, then start (you might be prompted to pick an interface. If so, somewhere in the preferences/config you can pick which interface to capture on. I'm not entirely sure where that's done in the win32 wireshark).
Once your download from ftp1.optonline.net is done, go to capture then stop. And then just use file -> save as and pick a file name. The default format should be a pcap file that others can read with wireshark/tcpdump/etc.
--
He who is not contented with what he has, would not be contented with what he would like to have. -Socrates |
|
birdfeedr
Premium,MVM
join:2001-08-11
Warwick, RI
·Verizon FIOS
| said by deblin :Once your download from ftp1.optonline.net is done, go to capture then stop. And then just use file > save as and pick a file name. The default format should be a pcap file that others can read with wireshark/tcpdump/etc. @ Hispanic: Suggest you run it just long enough to get a good capture on packets when your timing is down. Downloading the full 1 gig will be a very large pcap file. Look for file size that will give you 10 or 15 seconds capture.
I think there's a limit of how much DSLR will accept as an uploaded attachment.
Timestamp will show packet timing. |
|
deblin
Dark Side of the Moon
Premium,MVM
join:2001-09-01
Middletown, DE
| Well the test64 file should be sufficient, but yes if wireshark defaults to capturing the entire packet and not just the tcp/ip header, that should be changed prior to capture, or the capture should be zip'd or gzip'd prior to attachment here (they compress fairly well).
--
He who is not contented with what he has, would not be contented with what he would like to have. -Socrates |
|
