I'm trying to debug a latency / bandwidth issue with 2 servers ( DELL 860 ) connected by infiniband. Servers use 10Gb cards connected on a MTS2400, here are the result for bw and latency: [code]
Are those values 'normal'? I was hoping to get more bw and less latency.I'm using CentOS 6.4 with ib_ipoib driver, it's using stock settings.
Over the last couple of weeks I've been noticing high amounts of jitter and latency over my home network. I've come to some conclusions but am not 100% sure if they are correct or not.When one computer on the network opens a web page, loads a video off youtube or downloads something all of the computers on the network have considerably increased latency for a short period.I've tested 3 computers over WiFI watching ping commands and will show some below in a moment. Tested 1 computer using ethernet to connect to the router and its still affected by the issue. Ive also actually used the router to ping an outside source while the ping is increased and this is also affected. This has only been happening for the last 2 weeks.
Heres a list of hardware being used/software and os.
Windows 7 with a Belkin G enabled usb NIC
Windows XP with a realtek rtl8139/810x
Windows 7 (Friends laptop)
Router = Netgear dg834g
Settings
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So I've read up on QoS and understand that my router doesnt support it but I still dont understand how 1 person using youtube can affect my network that much. As before 2 weeks ago it did not affect it what so ever, and it didnt in my old house either. So what this means is that browsing is fine on the network, just whenever you try and play a game or anything that requires low latency anyone touching the network means you get massive jitter.
So I am at a bit of a loss here. For the past week or so, I have been getting random spikes of high latency in online games like World of Warcraft/Star Wars: The Old Republic/League of Legends/etc and I have no idea what could be causing it. My ping used to run around 30-80 and lately is has been spiking from 100 to over 700 randomly. I have tried everything I could think of like not using my router, power cycling my modem several times, making sure my drivers are updated, no programs in the background causing it, no firewalls/anti-virus programs causing it, and several other little things like that. I have also called my ISP and they said everything seems to be working fine. And here's another weird thing, according to speedtest.net, my service is running as it should be: [URL]. The server my service is connecting to is in the next town over which is ~15 minutes away so that couldn't be it either.
Here is my system specs:
OS Version: Microsoft Windows 7 Ultimate, 64 bit
Processor: Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz, Intel64 Family 6 Model 26 Stepping 4
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my latency values are extremely high, sometimes millions(!) of microseconds. THe problem is always solved by disconnecting the 11b/g wireless LAN adapter, or the Intel(R) Gigabit Network connection. However, I can't work without internet.
View 19 Replies View RelatedAs of late whenever I, or any of my roommates, browse the internet we have noticed a slower browsing experience, where pages used to load instantly, there is now a noticeable delay in accessing web pages. Also, in playing online video games, whether it be on the PlayStation 3 or PC gaming, high latency is always present. The problem is present whether there is one computer connected, or five, Mac or PC, Wireless a/b/g/n or if connected through the ethernet port. What I ask is: What causes such behavior, and what can I do, if anything, to resolve this issue?
Running a DGL-4500 D-Link Router with Comcast service.
A trace route to google shows the following:
C:UsersAdministrator>tracert www.google.com
Tracing route to www.l.google.com [74.125.224.52]
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When using this laptop (Toshiba Satellite C660D-1GD) on the forum it seemed unusually laggy when changing pages, whereas when using my Toshiba Satellite L450D it is always more positive.Decided to do some ping tests via the cmd prompt (after checking the error count via telnet) and they were in the hundreds.The L450D ping tests are spot on so I know it isn't the router (Billion Bipac 7800N)Been the usual route, totally uninstalled the wireless adaptor (Realtek RTL8188CE Wireless LAN 802.11n) including the Cisco elements, Eset and MBAM full scan and downloaded chipset drivers. Even factory reset the router and deleted the wireless profile including reg entries as a last resort.After each of those operations (other than reinstalling the wireless adaptor) the latency would be spot on and continued to be after an immediate reboot, but logging on a couple of hours later or the following morning, they would be very high again.After reinstalling the wireless adaptor for the second time, on a hunch I removed the Ethernet cable and run another test. The latency came in high but when I re-ran the test wired, they were spot on.
Phoned up KnowHow techs and read off the numbers who then put me onto 2nd level tech. He remotely connected and ran a couple of ping -n 50 tests as well as a tracert but was unable to replicate the results I was gettiing. As nothing was broken (for him), nothing to fix but to phone again if it continued.I rebooted after the phone call and got the high latency straight off. I wondered, as the latency returned to normal after certain operations I'd done, whether the remote connection had the same effect.Having been on the phone for 55mins, I'd had enough.These are two tests I've recorded from today which are together in one Wordpad doc, so you'll be able to see what I mean. Ctrl+C has been a bit erratic so they are the only ones I've been able to save. [code]
last weekend i configured HSRP on our default gateway(Cisco 2600) and now i have the problem that the latency is constantly at 3ms and from time to time it goes up to 10 ms. Is that something i should have expected or is there someting wrong with my configuration? The standby ip adresses are the same adresses as the router interfaces had before and the CPU utilization is at 10 % so i do not know what happend here. I atached the config file so if you need further information i will gladly provid it.
View 4 Replies View Related\We have purchased AP 1041 and WLC 2500 and I am doing a testing on the configuration. It is fine when both AP and WLC are sitting on the same network. However, if I connect the AP to the WLC which is on another network, I found that latency is quite high when PING the gateway. Here is the brief topology.
AP (172.30.40.212) ------- (VLAN 1: 172.30.40.202) switch (VLAN 2: 172.30.41.202) ----------- (172.30.41.210) WLC
I try to plug the PC to VLAN 1 and do a PING test to the VLAN 1 interface and it causes some packet loss and high latency. [URL] If I do the debug ip udp on the AP, it seems the result is normal.
*May 28 13:53:36.951: UDP: sent src=172.30.40.212(26610), dst=172.30.41.210(5246), length=1069
*May 28 13:53:36.952: UDP: rcvd src=172.30.41.210(5246), dst=172.30.40.212(26610), length=89
*May 28 13:53:36.953: UDP: sent src=172.30.40.212(26610), dst=172.30.41.210(5246), length=685
*May 28 13:53:36.954: UDP: rcvd src=172.30.41.210(5246), dst=172.30.40.212(26610), length=89
Configuration:
AP 1041 Version: 15.2(2)JB
WLC 2500 version: 7.4.100.0
Both device are configured the static IP address manually with default setting and I do not enable DHCP option 43.
I have cisco 2811 at branch and 3845 at Head office. Two link with 256 kbps bandwidthe each. I did as follows: [code]
When link 1 down, traffic change to Tunnel 2. its OK.I want when link1 flaxuate or latency high (more than 60 ms) traffice change to tunnel 2. If link 2 goes high latency automatically change to tunnel 1.
Recently me and my girlfriend have been having issues with in game latency, receiving pings close to jittering to well over 300 where they were formerly in the 30-40s to identical servers. We live with a Chinese housemate who is extremely conscious of her privacy/personal space, we noticed a dirge of active ports on the router (both TCP and UDP) which seemed to have no association with any major application and assumed it was the old P2P boogie-monster. She is the only one who uses Wifi, an upon briefly deactivating the Wifi, all ping issues were instantly resolved. The bizarre thing is we still have plently of up/download bandwidth, I mean we're not swimming in a fibre optic connection but still a relatively healthy 1MB dl/70KB/s ul, more than enough for gaming.Deciding we needed a better idea of what was going on in the network, we downloaded Wireshark. We discovered a couple of things that might mean something, they might mean nothing at all:Firstly there was a deluge of random ARP requests coming from the suspect IP, something along the lines of:"who has 192.168.0.(random number) Tell (suspect computer's IP)"repeated over and over in bursts. A little googling found us this: Has Your Network been Now given that she is Chinese and is probably exposed to a lot of Chinese websites, is there any chance that this could be the root cause - could it drown the network to the extent that it produces terrible pings?Secondly there have been an inordinate amount of name queries coming from her IP to 192.168.0.255 (broadcast channel), they generally take the form of:
NBNS92Name query NB WPAD<00>
or
NBNS92Name query NB ISATAP<00>
and occasionally, it will name query my network id, leading to: (her ip being 192.168.0.3)
2144211275.734470000192.168.0.3 192.168.0.255NBNS92Name query NB (my id)<20>
2144231275.739314000192.168.0.3 (my id)TCP6658451 > netbios-ssn [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=4 SACK_PERM=1
2144251275.741325000192.168.0.3 (my id)NBSS126Session request, to (my network id)<20> from (her network id)<00>
2144271275.744124000192.168.0.3 (my id)SMB213Negotiate Protocol Request
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Now combine this with the sometimes 9-10 active ports our router assigns to her IP (which don't appear to relate to anything according to numerous port id sites), does this send out a red flag to any of you? I realize it would be so much easier if I could get access to her computer, but as I said, she is very private and timid and doesn't seem to like even having people in her room, let alone letting them use her computer.
Im notice after configure the trend micro url filtering on a Cisco 2821 high latency on Http navigation, the latency on the ping for the requests shows a 245ms latency, but if i disable this feature on the router, returns to normal navigation and decrease the latency up to 70ms.
View 5 Replies View RelatedI work for a small college. We have several Cisco 1200 Aironet deployed our the campus, all of which are configures to run multiple SSID's. The problem I have is that when I connect, via AP, it successfully connects to the desired SSID but on pinging the default gateway of said SSID I get high latency (avg around 100 - 200ms).When pinging from the switch (Cisco 2950) to the default gateway the latency is good (1-2ms). It is just high when I connect via the C1200 AP and try to ping.
View 1 Replies View RelatedWe are facing issue of high Latency and slowness with Switch Cisco 4507R at the Customer site.show logging for the Switch and if there is any IOS related issue [BUG] or some other finding for this case.
View 1 Replies View RelatedI have a WRT54G2 router (V1) with the most recent firmware that serves as the gateway between my Internet connection and my home network. Over the past few months, I've noticed that the router seems to consistently become unusable due to high latency when it runs for any period of time. The internet connection is working, but the latency is sometimes as high as 2000ms to ping Google or to run a test from Speedtest.net. When a computer is directly plugged into the cable modem provided by my ISP, the problems resolve.
Restarting the router proivdes a resolution of the problem, but over time the latency issues increase again until it needs to be restarted. Right now, I have it on a mechanical (plug) timer that restarts it every morning around 4AM, but this still doesn't seem to fix the overall issue; I've had to restart the router manually twice today. Before restart, my ping will be over 1000ms; afterward, it will drop back to 20-60ms.Note that the download and upload speeds don't seem to be affected by this, just the latency itself.
The problem appears on both wireless and wired connections.I'm not sure if this is a sign that our router is failing (it was purchased in 2009, so as far as consumer-grade solutions go, it's lasted a pretty decent span), or if there's some misconfiguration on my end, or if something with my ISP is making my router flip out. What can/should I do to fix this issue (please note that flashing the router with DD-WRT is not an option, this version generally sees decreased performance when DD-WRT is installed).EDITED TO ADD: I have ruled out internal traffic causing the problem (I reviewed the log files for the router and tried to identify any unknown stuff, but it seems fine). I can't quite figure out exactly what causes the router to develop the issue, but once it does, I've noticed the following:
Extremely high latency (1000ms+) for pings from any computer inside the network to an outside destination?The router itself cannot ping or traceroute once it has started developing these high latency issues - if you use the router's PING feature, it returns all timeouts.It does not seem to correlate with any specific type of traffic.
I have the same issue with Toshiba satellite AA665D-s6091 I expierience crackling sound when playing. peaks appeared when I had either the (cable and wireless) adaptors enabled, when I enable/disable the backlit keyboard and also when I enable/disable eco-mode.A Windows and driver update fixed the cable adaptor issue.
I ran the commands in post #19:
netsh int tcp set global autotuninglevel=disabled
netsh int tcp set global congestionprovider=ctcp
netsh int tcp set global dca=enabled
The wireless adaptor issue was fixed with these, however every time y enable/disable backlit keyboard or eco-mode on my laptop I still get this latency peaks around 18000 us and audio clicks. I check latency with DPC latency checker V1.3.0?
i have a cisco 3560x poe. ny currnet version is 12.2(58)SE2.the cpu process is aboute 30% average.my problem is- ping to the switch itself show me 12ms which is high latency.*note- data between two hosts no this has no latency.i realize the packet go into the cpu itself but, the cpu is not loadedusy. so my question is- is this natural behavior?
View 2 Replies View RelatedMy network Infrastructure consists of 2 core switches(cisco 3950, 24 port) and 3 access switches (cisco 2960G, 48port). No distribution layer.Both Core switches are connected to the BVI of a VPN router.PVST is running in all switches. The STP results are all good. We have 3 VLAN's in the LAN an IP routing is enables in the core switch. The network diagram is attached.
The issue we are facing is that , we get intermittent packet drops while pinging towards the access switches, and there is always a higher latency towards these assess switches.These issues are present even with no other users using the LAN. But these issues are not present while pinging towards the GW.
I guess, it is because of this, we have issues the accessing file server in the LAN. How do we go ahead with the troubleshooting. Will upgrading the IOS resolve this.The present version details is..
WS-C2960G-48TC-L 12.2(44)SE6 C2960-LANBASEK9-M
Product: Linksys Wireless-G Broadband Router WRT54G
Version: 6
Firmware: Has Been Updated
I am directly connected to my router. Lately, I have been receiving high latency spikes and total loss of internet. The problem must be related to my router, because when I connect to the internet through my modem I don't have this problem.
I recently moved from an old apartment in Downtown Montreal, to a suburb area, but still close to where I was before (10 km). I am using the same ISP provider, Videotron. The same speed. I was playing this game, Chivalry Medieval warfare, perfectly fine before, but now something is really wrong. Whenever I join a server, my ping skyrockets up to close to 200, sometimes drifting to 130 but never going below... and often rising back up again.Keep in mind that I filter servers by their pings. I only join servers that display a low ping (although often I won't see any, when I refresh.. there they are). I'll see a server with 30 ping, join it, and be at 200.It's entirely unplayable. Not only is it impossible to properly time parries anymore, but I also get a lot of rubberbanding. I've tested the internet here, and the speeds are accurate. 10 mbps down, 1 mbps up. I am connected to a Linksys E1200 router. I've tried everything I can possibly think of.I went into the router setup, disabled the firewall, added myself to a DMZ, tried to forward every port... rebooted the modem, my computer, the router, tried a different Ethernet cable.. nothing is working. It's very depressing. Nothing has changed on my own computer in the move. I also notice there is a delay of a second or so before I start to load a webpage when I click a link.
View 9 Replies View RelatedI am working as net admin which is i need to monitoring and manage my workplace network( education center )I got a few question about network traffic flow. Here is the issued.I got high bandwidth utilization so high after office hours which is only on night. as we know, after office hours there is no person at the office but the traffic flow on bandwidth utilization is high.what are the possibilities of this issued?
View 1 Replies View RelatedI have decent Bandwidth, high download speeds (25.67mbps) low ping(16ms) And okay upload speeds (4.47mbps). I usually browse Reddit and my father usually plays CoD. The problem is, whenever I try and download anything, his game slows down to where he gets kicked from the room.
View 3 Replies View RelatedRegion : Canada
Model : TL-WDR4300
Hardware Version : V1
Firmware Version : 3.13.17 Build 120426 Rel.29216n
ISP : Bell Canada
Just had my line upgraded to 50mbit down, and 10mbit up. Whenever the router is between the PC and the modem, my speeds drop to 30mbit. If i plug directly into the modem, I get the full 50Mbit. Upload speeds are always 10mbit.I've tried power cycling devices, and even replaced all cables with cat6 (which I know isn't the issue, but i'm just trying to eliminate everything)
We own a Wifi controller 5508, with many access points connected to him. Except on the site where the controller is installed, all other APs are configured in FlexConnect mode through our MPLS network to prevent roundtrip for local communications (local client to local server for example).
Because of important slowness on one site where 8 APs are installed, we captured the traffic going in and out of our MPLS router and we discovered that the APs are consuming about 150kbits/s each in one-way communications with the controller (controller to APs), even when nobody is present (the capture was done this sunday).
Could you confirm me if this behaviour is normal or not ? What could explain such a large amount of data between the controller and the APs ?
Region : Romania
Model : TL-WR841ND
Hardware Version :
Firmware Version : 3.13.27 Build 121101 Rel.38183n
ISP : cosmote
hardware version is WR841N v8.wireless works just fine. i use it for my smartphone and an old laptop. i use ethernet cable to connect to main computer where all is ok until i start using my bit torrent client. as soon as i build up traffic above 1MB the ethernet portion of the router freezes and needs a reboot. when frozen, wireless is still working and i still have access on the lan to the router via my browser. i got this router so i could have wifi for my phone. my old router (asus rx3041) worked just fine and i accessed my isp at the maximum speeds it would allow on a 60 gigabit connection.
Does the F9K1113 work with BT Infinity? I have tried to get this to work but I cannot
View 2 Replies View RelatedWe have an existing Cisco 2621 XM router with an ADSL interface connected to BT Broadband. Basic layout below:
Internet------ADSL on Cisco 2621 ------ Pix 506e ---- 3600 switch with inter VLAN routing to multiple VLANS
There are 5 static IP addresses. The internal FE port on the 2621 has one external assigned to it. The outside int of the PIX has another external IP assigned from the 5. The other 3 are NATd through to internal IPs via the PIX to internal servers etc.
The ADSL is being upgraded to BT Infinity. This new service comes with a separate VDSL modem and a separate BT router. Ideally I want to ignore the BT router and use the Cisco 2621 as it has 2 FE ports and I suspect I could do something using PPPOE.
So New layout would look like
Internet ----- BT VDSL modem------ Cisco 2621 ----- Pix 506e ---- 3600 switch with interVLAN routing to multiple VLANS
I think it is a bit strange the way it is setup as 2 static IPs cant be used. There is an opportunity to use a ASA 5505 which may become available.
We've just purchased an SRP547W that we'd like to connect to our BT Infinity line. What the WAN configuration should be?
View 5 Replies View RelatedI have a WRT54G working throughout our home. It has 4 hardwired ethernet connections, and several wireless connections working without any issues. Currently my Droid phone, iPad tablet and 2 laptops connect and get through to the internet via wireless connection.
Today I purchased a new TF700T Asus Infinity Tablet. I'm able to get it to connect to the router, see the network, and the router can see the Infinity Tablet (assigns an IP address), but no internet access.
what tools I can use to see where the traffic from the tablet is being blocked. The log on the router doesn't show me anything. I'm assuming there's a port or ports being blocked by the router, but no idea which ones.
Already tried hard resets and a firmware upgrade to no avail. In fact the latest firmware upgrade (4.21.5) hosed the entire network so I reverted back to 4.21.1
Ok, so my internet disconnects while downloading at high speeds, anything higher than 2mbs. I end up having to reboot my computer because my modem looks fine and even if I reboot it, it does not fix the problem. Repairing the connection does not work either.I have a Dell XPS 720 H2C. The computer came out in 2007, costed like 6 grand lol. I'm happy with it aside form this problem though. It sucks cause they quickly stopped making the computer so tech support on it is tough to come by. I have Cox Communications and when I run speedtest.net I get 140/30. I'm hoping they aren't disconnecting people that reach a certain download speed.Anyway I'm fairly positive it is an issue with my computer or Windows Vista. I know I should upgrade to Windows 7 and I just might if it turns out to be the culprit. I just don't want to do that unless I absolutely have to. So ya, first off when using utorrent my internet will crash if I have a lot of different torrents open and downloading at the same time. It will also crash if I have one torrent active and that torrent goes above 2-2.5 mbs download speed.Also when downloading from a fast filelocker my internet will crash. The only filelocker that will crash my internet without me browsing at the same time is a filelocker called Gamerfront. The speeds are around 2mbs. I will also crash sometimes though if I'm downloading and browsing at the same time. My downloading speeds could be well below 2mbs but if I am watching youtube, streaming, or just browsing the internet sometimes the internet will crash.
That is the main problem, but sometimes, rarely I'll disconnect just from watching a youtube video. That's happened maybe 3 or 4 times. Anyway that is the summary of my issue. Again only a computer reboot will fix my connection. When I get disconnected the modem does not change at all and is still working perfectly. The modem is relatively brand new as well. I haven't tried much to fix it because I just have no idea what I could do. Device manager looks fine, no exclamation points. I know when most people have this problem it's because of a router or it's the modem but I don't use a router and my modem seems to be totally fine. [code]
My wifes Dell D600n with with Intel 2200BG wireless G card was Extremely difficult to get access to internet at first @ 54Mbps, but achieved it after 3 weeks of trying, after I had replaced motherboard, to fix battery charging issue.
The current problem, that i cannot seem to surmount is: I replaced the wireless card with a newer Broadcom BCM43222, Dual band N wireless card, that should be capable of connecting at almost 6 times the speed of the older G card. Unfortunately, the new card seems unable to connect at all.
ADDITIONAL INFORMATION: The wireless switch via keyboard Fn & F2, has been on the entire time. I've tried a couple of different drivers, to no avail. Ive uninstalled/ reinstalled both the card and drivers several times, still no connection. The device manager reports the card is off, at all times, and i cannot find any way to alter this, but, despite the fact that this sounds like it could definitely cause no connection, this is unlikely to be the reason, because it has reported that the wireless card is off at all times since the new Motherboard was installed, and the Wireless G card worked perfectly for the past 2 months, and still does, while the device manager was all the while reporting it was off.
Also the wired broadband connection, via cat 5, had never worked after changing MOBO, Nor did the Dial up modem, til both modem and Ethernet came to life, last night after reinstalling drivers for both the modem and Ethernet. unfortunately doing the same thing for wireless had no effect. All this time the Intel wireless G card has, and still does work perfectly every time i remove the Broadcom Wireless N card and plug the G card back in. Until lastnight, The device manager reported the wireless card had no driver installed. now it recognizes the driver is installed but still cannot connect wirelessly One wireless card driver I tried was called: BROADCOM_ABGN_DD-WRT.zip. I lost track of the name of the other driver that i've been trying. Someone on another forum said after installing BROADCOM_ABGN... That one must go to device manager advanced properties and select US from choices of US, Japan, or Germany, To get this driver to work. I've tried this too. Again, No improvement.
Ive built my own computers for the past 30 years, and repair them all the time, for hardware problems, but I fear software is not my forte. My son, who is better at software. Usually, together, we can solve any mechanical electronic or software malfunction, but we're both stumped by this one. Admittedly, we all sometimes overlook a simple solution while seeking a very difficult one. Whenever I face a difficult malfunction like this, I think of when as a 5 year old I was privileged to accompany my Engineer big brother to a local Airport to repair what i would later learn was a Automatic Direction Finder System, needed before flight. As I sat beside my on the tarmac, watching him sweat bullets trying to effect a quick fix, I noticed something that looked out of place to me, and started chanting his name, Ronnie, Ronnie, Ronnie... ad infinitum, as kids are like to do, til in desperation he finally dropped his screwdriver withwhich he aws about to dismantle the entire mechanism, and fairly yelled what?, to which I asked timidly, Ronnie are all those lightbulb things (electron tubes) supposed to be lit. he said of course!, and continued working, ignoring me for another hour. Finally when he stopped to scratch his head, I said "If they're all supposed to be lit why is one of them not lit? he insisted they all were, but was adamant that they weren't. when he asked which one, and i pointed to it. He tested it verifying the filament was, indeed, open, and demanded to know why id watched for 4 hours and hadn't said that before.
I have a dell poweredge 830 (3.0 dual core pentium, 2gb ram, 2x160gb hdd in raid 1, dual port intel gigabit card). I'm trying to find a router OS that logs bandwidth by ips on the lan. I tried untangle and clearos neither of which have a feature (or one that I can find) that logs the bandwidth by ip. Apparently pfsense has a package you can install but I have never been able to get pfsense to work on this pc, it always errors in one way or another (on the 2.0rc3 I can't access the web page, it says it is missing a file).
View 19 Replies View RelatedI have a annoying problem with my Dell L702x i5-2430M @ 2.4 and Intel Centrino Advanced-N 6230. When I reach high downloading speeds (4-9mb/s) and have music on ( laptop speakers, using media player classic build version 1.5.2.3456) I hear some intense crackling sound from the speakers, but only when the music is on, whenever I pause the music the crackling stops. If I stop my downloads then the crackling sound disappears.
View 4 Replies View RelatedI have to manually deactivate high definition audio unit and restart the computer everytime I want to listen through the bluetooth unit. I have just installed Windows 7 on my Dell Inspiron 9400. Running truemobile 355 bluetooth driver. When I ran Windows XP and wanted to listen through the bluetooth unit the "switching" went automaticaly.
View 2 Replies View Related