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The Sorcerer’s Apprentice
Tetsujin
Posts: 13
Registered: ‎23-07-2010

DNS lag

[ Edited ]

I appear to have very long DNS times since getting the Superhub. Overall speed to a low-ping site on speedtest comes out at about 85Mb DL, 4Mb UL which is OK, assuming I've not had the UL speed doubled yet, but I guess could be better. [retested just now, both direct connection through router & back to modem mode through my own gateway, 105 DL, 4.8 UL, very nice]

 

The real problem, though, is the huge lag time when doing something as simple as opening a web page, 5 or 10 seconds at worst, then the page flashes in at full speed. This is wired, from any machine in the house.

I usually run my own gateway, with firewall, NAT, DNS & DHCP, & have the superhub in modem mode. Right now, I have a single machine connected, in router mode, to be able to get at the info.

 

Rebooting the entire network seems to do the trick for a while, but after about 24 hrs it is noticeably worse. The old 50Mb modem I used to reboot about twice a year - every 24h seems a tad less reliable.

 

I wondered if someone could check these figures look OK... before I start delving into wireshark, which is really beyond my current skill-set ;-)

 

Locked 56 291000000 Hz QAM256 -1.7 dBmV 39.8 dB 212 0

Locked 57 299000000 Hz QAM256 -1.7 dBmV 40.1 dB 111 0

Locked 58 307000000 Hz QAM256 -1.7 dBmV 39.9 dB 131 0

Locked 59 315000000 Hz QAM256 -2.0 dBmV 39.2 dB 130 0

Locked 60 323000000 Hz QAM256 -1.7 dBmV 39.1 dB 59 0

 

Locked 50 35800000 Hz ATDMA 35.8 dBmV 16QAM 6400000 20480 Kbits/sec

 

(darnit - I had that in a nice table, but it didn't seem to like it ;-)

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Forum Team
Jen_A
Posts: 7,581
Registered: ‎23-11-2011

Re: DNS lag

[ Edited ]

Hi Tetsujin,

 

I am not able to test your hub as it is currently offline.

 

Could you please leave it powered on and let us know so we can investigate this for you.

 

Also, it would help if you could run a traceroute and post the output. This will help to identify any packet loss or high ping times. 

As you have this problem when using the hub in modem mode, this does discount any firmware related issues but it might be worth you trying with your pc in safe-mode-with-networking. I am not saying this is a pc fault, but it would be interesting to see the difference (if any) in results.

 

 (Btw, the power levels you posted look fine.)


Jen_A
Help & Support Forum Team

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The Sorcerer’s Apprentice
Tetsujin
Posts: 13
Registered: ‎23-07-2010

Re: DNS lag

Thanks for getting back to me & glad the power levels look OK.

 

That's odd, though, that you can't see it - the router is always on, unless It's rebooting, which I haven't done in the past 24h. [actually, have now done since starting this reply]

It is in modem mode & the gateway behind it is stealthed, if that would make a difference.

 

I have since discovered that Mac OS X 10.8 & Safari are having reported problems with slowdowns - but when I'm seeing the issue, it's not only my machine, but any on the network, the rest are Win XP & Win 7, all up to date, no dodgy 'speed boosters' etc. Rebooting this machine does improve it, but not as much as rebooting the entire network, router, gateway, switch, all machines.

Other than the update to 10.8 in the past month, there are essentially no other changes that I am aware of, other than standard Win updates etc.

 

Running in safe + networking is hard to do without cutting the rest of the machines off for an extended period. I did try with just the Mac & the modem back in full router mode to get the power figures, but I'd be pretty unpopular if I did that for any length of time. The issue never appears when everything is freshly booted.

 

I took some readings when it got really bad the other day, at that point it was taking over 4 mins just to refresh the forum page. Unfortunately, I didn't keep them, & right now it's pretty much behaving itself, except for that 1st hop outside the building which looks a bit long - I have to admit to not knowing enough about it to figure why that hop has a longer response time than one beyond it.

 

Pinging that on its own looks jittery, though

PING 92.236.36.1 (92.236.36.1): 56 data bytes

64 bytes from 92.236.36.1: icmp_seq=0 ttl=63 time=7.934 ms

64 bytes from 92.236.36.1: icmp_seq=1 ttl=63 time=9.404 ms

64 bytes from 92.236.36.1: icmp_seq=2 ttl=63 time=17.485 ms

64 bytes from 92.236.36.1: icmp_seq=3 ttl=63 time=46.996 ms

64 bytes from 92.236.36.1: icmp_seq=4 ttl=63 time=9.680 ms

 

traceroute to virgin.lithium.com (46.19.168.46), 64 hops max, 72 byte packets

 1  name removed (192.x.x.x)  0.808 ms  0.335 ms  0.197 ms

 2  cpc5-enfi17-2-0-gw.hari.cable.virginmedia.com (92.236.36.1)  12.074 ms  17.890 ms  19.477 ms

 3  hari-core-2b-ae7-725.network.virginmedia.net (81.96.18.113)  9.918 ms  10.606 ms  15.921 ms

 4  popl-bb-1b-ae8-0.network.virginmedia.net (81.96.16.205)  12.022 ms  7.330 ms  18.025 ms

 5  popl-bb-1a-ae0-0.network.virginmedia.net (213.105.174.229)  7.759 ms  7.530 ms  16.254 ms

 6  popl-tmr-1-ae4-0.network.virginmedia.net (213.105.159.2)  61.485 ms  9.977 ms  24.510 ms

 7  amst-ic-1-as0-0.network.virginmedia.net (213.105.175.6)  15.724 ms  18.886 ms  24.477 ms

 8  te0-7-0-10.ccr21.ams04.atlas.cogentco.com (130.117.15.5)  24.253 ms  15.375 ms  33.430 ms

 9  te0-2-0-3.mpd22.ams03.atlas.cogentco.com (154.54.36.133)  24.693 ms

    te0-0-0-7.mpd21.ams03.atlas.cogentco.com (130.117.2.61)  17.643 ms

    te0-0-0-7.ccr22.ams03.atlas.cogentco.com (130.117.2.65)  27.013 ms

10  te1-1.ccr01.ams07.atlas.cogentco.com (154.54.57.230)  20.809 ms

    154.54.74.173 (154.54.74.173)  17.684 ms

    154.54.74.177 (154.54.74.177)  16.614 ms

11  149.6.129.194 (149.6.129.194)  22.202 ms  21.638 ms  26.411 ms

12  community.virginmedia.com (46.19.168.46)  19.199 ms  19.211 ms  16.466 ms

 

Let me know if any other info could help.

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Freakishly Helpful
Leanne_K
Posts: 1,837
Registered: ‎21-03-2012

Re: DNS lag

Hi Tetsujin,

 

Once again it is showing your superhub as offline, if it is switched on then please call in to tech support on 0845 454 1111, or 150 from a Virgin landline to book an engineer visit or alternatively reply to this thread.

 


Leanne K
Help & Support Forum Team

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