dslreports logo
site
 
    All Forums Hot Topics Gallery
spc

spacer




how-to block ads


Search Topic:
uniqs
3110
share rss forum feed

jus100

join:2006-02-27
Oakland, CA

High ping times

Since upgrading to AT&T Uverse (12Mps,in Oakland CA), I've had interrmittently terrible ping times, particularly noticeable while playing World of Warcraft. But the ping times are appalling long even for pinging google:




traceroute to google.com (74.125.227.40), 64 hops max, 52 byte packets
1 homeportal (192.168.1.254) 1.160 ms 1.012 ms 0.996 ms
2 76-218-100-2.lightspeed.sntcca.sbcglobal.net (76.218.100.2) 614.901 ms 653.783 ms 630.733 ms
3 * * *
4 * * *
5 * * *
6 12.83.39.137 (12.83.39.137) 26.241 ms
12.83.39.145 (12.83.39.145) 403.526 ms 432.944 ms
7 12.122.114.21 (12.122.114.21) 428.984 ms 461.143 ms 475.129 ms
8 * 12.249.231.14 (12.249.231.14) 545.713 ms *
9 209.85.249.3 (209.85.249.3) 671.785 ms 691.179 ms 769.346 ms
10 209.85.250.60 (209.85.250.60) 688.656 ms
209.85.250.63 (209.85.250.63) 713.331 ms
209.85.250.60 (209.85.250.60) 742.686 ms
11 216.239.46.212 (216.239.46.212) 761.382 ms 819.382 ms 855.922 ms
12 72.14.239.48 (72.14.239.48) 827.826 ms 864.472 ms 884.077 ms
13 209.85.253.172 (209.85.253.172) 881.978 ms 911.483 ms 979.536 ms
14 216.239.47.120 (216.239.47.120) 918.158 ms 956.439 ms 971.620 ms
15 72.14.237.214 (72.14.237.214) 993.929 ms 988.750 ms 1053.660 ms
16 209.85.250.77 (209.85.250.77) 996.675 ms 260.538 ms 524.174 ms
17 dfw06s06-in-f8.1e100.net (74.125.227.40) 519.597 ms 536.476 ms 548.107 ms

Can anyone help me? Thanks.


Mangix

join:2012-02-16
united state

that is...terrible.

Download UV Realtime and post screenshots of the IP/Profile, Error Table, and Bitloading tabs.

»uvrealtime.com/download.aspx


jus100

join:2006-02-27
Oakland, CA

Is there a Mac equivalent to UV Realtime?



Mangix

join:2012-02-16
united state
reply to jus100

no. you could try XP in a VM under Mac or something else.


jus100

join:2006-02-27
Oakland, CA

Click for full size
Click for full size
Click for full size
OK, it took half the night to figure out how to run UV Realtime here (I finally had to get a Win 7 laptop), but I now have screenshots. Of course, my connection has been maddeningly inconsistent, swinging from perfectly fine to perfectly terrible in minutes. So right now the numbers aren't bad (my google.com ping time is ~25ms), but 10 minutes ago I had to quit WoW because my ping times were in the 700ms range and the game was barely playable.

Hope the screenshots show something useful. Next time things get crappy I'll try to generate more data. Thanks in advance for your help.


Mangix

join:2012-02-16
united state
reply to jus100

As far as I can tell, there is a bridge tap somewhere in the line which is causing 0 bitload on some of the low frequencies. It's weird that you have issues though since the error table is relatively clean and your stats are really good.


jus100

join:2006-02-27
Oakland, CA

Could it be that AT&T is throttling my line when I start using high bandwidth applications like WoW?



Mangix

join:2012-02-16
united state

1 edit
reply to jus100

No.

And WoW is not a high bandwidth application.

edit: I just realized. The 2Wire Gateways all have seriously bad bufferbloat. What is bufferbloat? It's an effect that happens when your internet connection gets maximized in one direction(usually upload). So if some application is uploading at the maximum speed, your download speed will suffer and so will your ping times.

The easy fix to this is to rate limit your connection so that applications upload at around 90% of your internet speed instead of 100%. Most routers have a QoS function that does essentially this. But the 2Wire does not.

To mitigate this(if this is even the issue), you can either put another router in between the 2Wire and your computer or you can try software that will do this. I don't have too many recommendations for the latter but I can say that I do use cFosSpeed. The only problem is that it's paid software. Nevertheless if interested: »cfos.de


jus100

join:2006-02-27
Oakland, CA

Click for full size
Click for full size
 
Thanks - I have an Apple Airport Extreme running in bridge mode right now. Will that work to limit upload speeds? I guess I'll have to put it back into DHCP router mode again?

I'm experiencing another drop in service



I've taken more screenshots from UV Realtime and am posting them here. They look pretty much the same to me, but I really don't understand most of it.

jus100

join:2006-02-27
Oakland, CA

I've gone ahead and inserted an old Linksys 3600HGV in between the Airport Express (in bridge mode) and the 2Wire gateway. I set the Linksys to limit uploads to 1.35 Mbps. (I also had to troubleshoot a bunch of DHCP address conflicts!). My desktop is going to be plugged directly into the Linksys - everything else will run wirelessly via Airport. I'll let you know how it goes.

(The 2Wire already gave me a "Router behind Router" error message and, its suggestion, I put it into "DMZPlus Mode". Hope that wasn't a mistake...)


jus100

join:2006-02-27
Oakland, CA

Hmmm...my download speed apparently has taken a 50% hit....




Mangix

join:2012-02-16
united state
reply to jus100

Based on those screenshots, your line is fine. There were no drops(link retrains) at all. Just a few corrected blocks which is normal.

I take it the linksys was a WRT54G? There's no linksys 3600HGV.

As for the speed issue, I really don't know. Maybe the Linksys router has hardware which is too weak to do QoS reliably. Who knows.

If possible, I'd recommend flashing that linksys(depending on which it is) with tomato as tomato has much better QoS. But flashing isn't really for the faint of heart. The clean solution is probably cFosSpeed but that costs money.

Also, are you running wired or wireless? I know the wireless support in the 3600HGV can sometimes be flaky.



davetaht

@91.103.37.x
reply to Mangix

No the solution is not to ratelimit alone, but to ratelimit and apply a smart queueing discipline like "fq_codel", or sfq.

»www.ietf.org/proceedings/86/slid···rg-3.pdf


jus100

join:2006-02-27
Oakland, CA

Sorry, I meant a Linksys BEFSR41. It's very old, but it's what I had in the closet. And I'm running WiFi via the Airport Extreme (bridged) to just about everything in the house, except for my main desktop machine, which is connected with Cat-5 to the Linksys.

So far I haven't been seeing any really horrible ping times -- mostly in the 20-40ms range. The d/l speed (paying for 12mbps) has been ranging from 7 to 11.5 mbps. UL has been a little worse - 0.5-1.3 mbps.

I don't have the same network engineering chops as you guys do, so I'm not sure I want to take on implementing some complicated QoS discipline. Rather than doing that, I'm thinking of dumping AT&T and their crappy customer service for a local ISP called Sonic.

Mangix (and davetaht), thank you so much for your comments and help. It's great to have people like you on the boards providing tech support (the kind AT&T seems incapable of).



StillLearn
Premium
join:2002-03-21
Streamwood, IL
Reviews:
·AT&T Midwest
reply to jus100

said by jus100:

Hmmm...my download speed apparently has taken a 50% hit....

Be sure the BEFSR41 is set for 100 Mb Ethernet.

jus100

join:2006-02-27
Oakland, CA

StillLearn, sorry to be clueless, but I can't find a setting for 100 Mb Ethernet on the Linksys setup pages. Where do I check that setting?



StillLearn
Premium
join:2002-03-21
Streamwood, IL
Reviews:
·AT&T Midwest

said by jus100:

StillLearn, sorry to be clueless, but I can't find a setting for 100 Mb Ethernet on the Linksys setup pages. Where do I check that setting?

OK... I can't find such a setting either. Apparently the 10/100 is fully automatic.

I had a situation where I had set my computer to 10 to make setting up a device work, and forgot to set it back. Speeds were held down. My thought that it might be a factor in your slow-down appears to be wrong.


Mangix

join:2012-02-16
united state
reply to davetaht

Too bad almost nothing supports fq_codel. Broadcom routers are out of luck due to mandatory old kernel and they just so happen to be the majority. OpenWRT is an answer but very limited hardware support.

BrainSlayer recently added fq_codel to DD-WRT but not for all models. Most likely it will just be the atheros ones that get it.


jus100

join:2006-02-27
Oakland, CA
reply to jus100

Re: firewall/port issue after fixing high ping times

Hopefully you're all still paying attention to this thread.
I've successfully fixed my ping time/latency issue, but I've created a weird firewall issue I can't seem to figure out.

As I described above, I've configured my network as follows

iMac --> ethernet --> Airport Extreme (bridge mode) --> linksys befsr41 (uploads throttled to 90% of max) --> 2Wire 3600HGV --> ATT Uverse

For most applications and uses, this seems to work fine. But I'm running into weird connectivity issues with downloading iPhone updates from the iTunes store (errors 3104 and -1) and using Apple's built-in VPN to connect to my workplace (no connection). I don't get any of these issues if I connect

iMac --> ethernet --> 2Wire 3600HGV --> ATT Uverse

but I seem to get them if I just cut out the Airport Extreme or if I just cut out the linksys befsr41.

I'm assuming this is some kind of weird alternate port issue, so I tried changing the firewall settings on the 2Wire, and weirdly, I got the VPN working again for about 10 minutes back into my original configuration. But then it stopped being able to make the connection even though I didn't change anything! I've never been able to get the iTunes iPhone updates to work though -- still getting those errors unless I manually switch the ethernet cable to go directly from the iMac to the 2Wire.

Any ideas what I should try? Thanks!