Wireless Slows Down Randomly

Hi all,
This is my first post to the forums regarding this issue. So please bear with me if I show ignorance. Ok, so a few months ago I installed Ubuntu 14.04, thus replacing Windows 8.0. While I had windows, wifi worked fine, just perfectly. When I installed Ubuntu, it was like a leash had been put on my speed. Occasionally. See that is the strange part, the speed only slows down every once in awhile, and other times runs fine. Well, I got so frustrated that I decided to move on to OpenSuse, it was time for a change of scenery anyways. The changed OS did not fix the problem though. So I went through guides, tutorials, and finally have done the stickies on this forum. Here are my findings, if anyone can help I would greatly appreciate it!!

Wireless LAN: Available

Kernel Driver: iwlwifi

UDI: unfound

/sbin/lspci:

09:00.0 Network controller: Intel Corporation Centrino Wireless-N 2230 (rev c4)

/sbin/lspci -n:

09:00.0 0280: 8086:0887 (rev c4)

dmesg|grep firmware:

 9.849993] iwlwifi 0000:09:00.0: loaded firmware version 18.168.6.1 op_mode iwldvm

/usr/sbin/iwlist scan:
wlo1 Scan completed :
Cell 01 - Address: E8:89:2C:CC:9E:A0
Channel:11
Frequency:2.462 GHz (Channel 11)
Quality=62/70 Signal level=-48 dBm
Encryption key:on
ESSID:“HOME-9EA2”
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 9 Mb/s
18 Mb/s; 36 Mb/s; 54 Mb/s
Bit Rates:6 Mb/s; 12 Mb/s; 24 Mb/s; 48 Mb/s
Mode:Master
Extra:tsf=000000931c5f38a1
Extra: Last beacon: 361862ms ago
IE: Unknown: 0009484F4D452D39454132
IE: Unknown: 010882848B961224486C
IE: Unknown: 03010B
IE: Unknown: 2A0104
IE: Unknown: 32048C98B060
IE: Unknown: 2D1A8E1117FFFF000001000000000000000000000000000000000000
IE: Unknown: 3D160B070600000000000000000000000000000000000000
IE: Unknown: 3E0100
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : TKIP CCMP
Authentication Suites (1) : PSK
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : TKIP CCMP
Authentication Suites (1) : PSK
IE: Unknown: DD180050F2020101000003A4000027A4000042435E0062322F00
IE: Unknown: 0B0506002C127A
IE: Unknown: 4A0E14000A002C01C800140005001900
IE: Unknown: 7F0101
IE: Unknown: DD07000C4303000000
IE: Unknown: 0706555320010B10
IE: Unknown: DD870050F204104A0001101044000102103B000103104700102880288028801880A880E8892CCC9EA010210005415252495310230006544738363247102400065254323836301042000831323334353637381054000800060050F204000110110012415252495320544738363220526F7574657210080002210C103C0001011049000600372A000120

eno1 Interface doesn’t support scanning.

lo Interface doesn’t support scanning.

Iwconfig:
wlo1 IEEE 802.11bgn ESSID:“HOME-9EA2”
Mode:Managed Frequency:2.462 GHz Access Point: E8:89:2C:CC:9E:A0
Bit Rate=1 Mb/s Tx-Power=16 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=70/70 Signal level=-33 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:7 Invalid misc:33054 Missed beacon:0

ping -c 5 own IP works: works
ping -c 5 samba.org IP: fails // Seems to me to be the only thing wrong??? Don’t know though…

ping -c 5 www.samba.org: works

/usr/sbin/iwconfig wlo1 | grep Mb :
Bit Rate=108 Mb/s Tx-Power=16 dBm

If any more information would be helpful please let me know. I know that you guys answer these questions non-stop, and I do appreciate all your hard work!!

On Mon 01 Dec 2014 10:16:02 PM CST, wolfio1991 wrote:

If any more information would be helpful please let me know. I know that
you guys answer these questions non-stop, and I do appreciate all your
hard work!!

Hi
Many other AP’s on the same channel? I found I had to set the routers
bandwidth to 40Mhz and upper sideband control channel to stay at
150Mbit/s and 300Mbit/s with my wireless cards…

Also windows may be different in what it shows you… :wink:


Cheers Malcolm °¿° LFCS, SUSE Knowledge Partner (Linux Counter #276890)
SUSE Linux Enterprise Desktop 12 GNOME 3.10.1 Kernel 3.12.28-4-default
If you find this post helpful and are logged into the web interface,
please show your appreciation and click on the star below… Thanks!

Hm. Malcom, what does that mean, lol. I am still learning all of this. I am able to see about 6 AP’s whenever I look at potential signals. I downloaded the Wifi Analyzer from Google Play store. It appears that my network is broadcasting on Channel 11, at 2.4ghz at anywhere between -50 to -40 dBm (I don’t know what that is).

On Tue 02 Dec 2014 12:26:02 AM CST, wolfio1991 wrote:

Hm. Malcom, what does that mean, lol. I am still learning all of this. I
am able to see about 6 AP’s whenever I look at potential signals. I
downloaded the Wifi Analyzer from Google Play store. It appears that my
network is broadcasting on Channel 11, at 2.4ghz at anywhere between -50
to -40 dBm (I don’t know what that is).

Hi
Can you logon to your wireless router via a web interface? If not sure,
what model wireless router do you have.

When you do your wireless check, are other access points on the same
channel? Also positioning of the router and antenna orientation can
make a difference…


Cheers Malcolm °¿° LFCS, SUSE Knowledge Partner (Linux Counter #276890)
SUSE Linux Enterprise Desktop 12 GNOME 3.10.1 Kernel 3.12.28-4-default
If you find this post helpful and are logged into the web interface,
please show your appreciation and click on the star below… Thanks!

I can log on to my router’s web interface. There are no other AP’s broadcasting on my channel, but there is two broadcasts from my router. Xfinity offers a service where your router produces a ‘guest’ signal. Never knew about it before this until research prevailed. Regarding the positioning of the Router/Antennae, I don’t believe this is a problem. The reason is that every other computer or cell phone has decent signal, and decent service.

Again, I thank you for your help!

I would turn off the guest signal, if you have it on.

Guest signal is turned off. I will post soon to see if it has fixed my problem! Thanks

So it’s been a couple of days, one actually, now since I turned the guest signal off, and the problem persists. Any other suggestions?

You’ve been far too vague about slow-downs when you mention

See that is the strange part, the speed only slows down every once in awhile, and other times runs fine.

Many have observed similar with particular providers on congested networks. You really need to check the behaviour with wired vs wireless connectivity. Alternatively, you could check the performance by adding an iperf server at the router (via ethernet), and test the speed to your wireless-connected machine. (Part of my job is to test BW of various network segments this way.)

BTW, the RSSI signal level you mentioned was -40dBm to -50dBm, and that is a reasonable signal level. The modulation (data) rates that were reported show that your device is currently using 802.11g connectivity. As a wireless engineer, I have seen cases where spurious interferrence can impact on a link and cause it to change modulation dynamically and frequently. This affects the resulting data throughput at these times too.

Shoot, I was trying to avoid that one single statement of being vague! Ok, so for example, say I am simply browsing the web using Firefox, and everything is running smoothly, pages load in milliseconds, no issues at all. Well, randomly (with no pattern that I can find) a page will take seconds to minutes to load. After this one page (No single webpage does this, there are many) does this, all pages afterwards will take a much longer time to load. I am sure that the router has no issues, because every other wireless device in the network works fine. These other devices have much more distance and objects between them and my laptop.

What exactly is iPerf? Reading through the documentation on their website it appears that they help with TCP problems? Could this be the issue? If so, what do I do to test this??

Thanks again for all your help!!

Still not enough information to go on. I’ve had browser ‘add-ons’ that can cause problems with page rendering, or problematic javascript causing issues like this for example. However, you could eliminate the wireless link by testing accross the LAN only (eg copying files from one local machine to another). Does the problem occur if you are connected by ethernet cable to to the router, or wireless only?

What exactly is iPerf? Reading through the documentation on their website it appears that they help with TCP problems? Could this be the issue? If so, what do I do to test this??

Thanks again for all your help!!

It’s a network utility used to perform throughput tests (eg bandwidth measurement). You need to read and take the time to learn it. Essentially, you’d connect one machine via ethernet to the the router, and run iperf as a server, then take your laptop and run iperf as a client, and undertake BW testing. (From your desctption above, it doesn’t come accorss as a wireless issue though.)

On Sun 07 Dec 2014 05:46:01 PM CST, wolfio1991 wrote:

Shoot, I was trying to avoid that one single statement of being vague!
Ok, so for example, say I am simply browsing the web using Firefox, and
everything is running smoothly, pages load in milliseconds, no issues at
all. Well, randomly (with no pattern that I can find) a page will take
seconds to minutes to load. After this one page (No single webpage does
this, there are many) does this, all pages afterwards will take a much
longer time to load. I am sure that the router has no issues, because
every other wireless device in the network works fine. These other
devices have much more distance and objects between them and my laptop.

What exactly is iPerf? Reading through the documentation on their
website it appears that they help with TCP problems? Could this be the
issue? If so, what do I do to test this??

Thanks again for all your help!!

Hi
DNS issues? I don’t use my ISP’s as they suck, so use openDNS instead.
Either configure in your router or per machine.

Disable ipv6 if you don’t use it (systemwide and Firefox).

Best to install wireshark and run that and when it strikes, check what
is happening.

Even though I might see the indication change to 1Mb/s I can still
download at my full speed of 6Mb on the internet and locally.


Cheers Malcolm °¿° LFCS, SUSE Knowledge Partner (Linux Counter #276890)
SUSE Linux Enterprise Desktop 12 GNOME 3.10.1 Kernel 3.12.28-4-default
If you find this post helpful and are logged into the web interface,
please show your appreciation and click on the star below… Thanks!

I am assuming it is a wireless issue, because plugging the computer into an ethernet on my router allows the computer to run smoothly! Now that you mention it it could be a JS problem…I have seen several times where the loading bar has mentioned something about loading Javascript. The current add-ons I run on Firefox are:

  • Opensuse FIrefox Extensison 1.0.2

Plugin’s

  • Iced Tea Web Plugin
  • OpenH264 Video Codec
  • packagekit
  • shockwave Flash 15.0.0.239
  • Shockwave Flash 11.2.202.418
  • Skye Button for Kopete

The appearance is simply Default 33.0

A DNS is network wide though, isn’t it? My other computers have no issues, and they are hooked through the same wifi, so I would have expected a DNS issue to cause problems across the board? Could my DNS be updating/unavailable during these specific times on this specific computer when I have issues?

IPv6 is disabled, both in the network settings and, as far as I know, in Firefox. I didn’t select a specific option for this in Firefox so I am not sure.

WireShark? I will research!

The OP could also download DNS Benchmark (it is an exe) and it is designed to also work fine in Wine on Linux. Simply download it to a directory, then launch it by clicking on it.

This will test available DNS Servers. I recommend using the option to check for neighbouring DNS Servers and let it build a custom list, then run the tests.

I used it to find a few DNS Servers in my area and the result is a huge difference in internet performance.

DNS Benchmark is here:

https://www.grc.com/dns/benchmark.htm

I keep them all disabled until they are specifically needed for something I want to do.

Two Flashes? No conflict?

I never browse with Flash enabled, by the way, only turn it on when there is something specific I want to play that does not work in HTML5.

And, in fact, I added and use the extension SettingSanity:

Re-adds the options to disable Images, JavaScript, and the Tab Bar in the Options window.

SettingSanity is a solution to the inane removal of some of the most useful features in Firefox. It also adds the option of toolbar buttons for toggling Images and JavaScript without opening the Options window.

https://addons.mozilla.org/en-US/firefox/search/?q=settingsanity&appver=31.0&platform=linux

With that, I also do all browsing with JavaScript turned off. I only turn it on when I need it at a place I trust, such as this forum.

(As an aside, I do not have any JavaScript running on any of my websites, yet I am able to do what I want with my presentations. There are some instances when JavaScript is important, such as for secure login here at the Forum. It actually can be done without JavaScript, but JavaScript is able to make it more secure.)

And, in fact, I added and use the extension SettingSanity:

Nice Tip. :slight_smile:

Ok, I ran DNS Benchmark, and there were a ton of errors! I find this very strange, because as I said before I thought a DNS was provided by your ISP and your whole network would be affected with bad DNS’s…

Anyways, so I ran the customizable list option, and it created one. So perhaps that will fix my problem?

Next, I also shut down all extensions/addon’s as recommended, and perhaps this will also help?

Time will tell! Thanks again, I will post in a few days to see if this fixed the issue.

Did you then run the test on the new list? This should tell you which DNS Servers are providing the best response, and you should choose from them to enter into your router DNS Servers list or into your Networking DNS Servers list on the machine.

… and, no, we do not know if this is what your problem is, but we are making suggestions that might solve it or narrow it down.:slight_smile:

It appears the problem is solved, though I plan on running the benchmark again. How do I go about completing the other steps?