General :: Network Stop Working After Heavy Load Of Packets Received
Aug 6, 2011
My LAN has 2 PCs installed, Ubuntu 10.04 and Windows XP. I run the server on Ubuntu, and client on Windows XP. Because I am doing stress test, so the client will keep sending tons of packets to server.
The strange thing is: After few seconds, the client program crash because of insufficient network buffer, the server is still ok. But after that I cant connect Ubuntu PC anymore until I restart it. And I check the router, the led for the Ubuntu PC is always ON (not blinking), look like it is jam already.
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Jan 19, 2011
this is with both network manager and WICD, a problem i've had since i got ubuntu - multiple wipes and reinstalls the wifi is supported out of the box, the problem i've randomly run into since installing is, it will randomly stop detecting networks "no networks detected"
i've noticed over time as this as been happening, that it usually happens whenever there is a high load - multiple videos going on multiple tabs, videos queued up etc. its never happened during regular browsing - theres always a lot going on when it happens, almost like it collapses. the only way to fix this, is to quit the manager - shut off the computer (restarting doesnt work) and then it comes back after
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Mar 15, 2010
I have a DSL brodband connection. The internet connectivity was working fine but lately, I am am facing problems while connecting to internet.Upn connecting the cable to the eth0, the /var/log/messages shows repeated instances of:"kernel:corrupted packets received"Also, if i use pppoe-dicovery, I get " Timeout Waiting for PADO packets" error.There is nothing wrong with the cable. If I connect the cable to a windo$s xp laptop, internet connects fine without any problems.Any idea what could be going wrong? Since the internet was working fine earlier on my opensuse box, im not sure what could have gone wrong with the settings.
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Jan 14, 2010
I am new to Ubuntu almost installed it after windows showed blue screen 4 ever n ever. However after installing ubuntu whenever I log in windows it doesnt detect any network connection but when I use Ubuntu it automatically does can it be that Ubuntu is causing any problem? And how to check how many packets are being sent and received through my wired network and do I have to install any drivers for my modem in Ubuntu.
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May 3, 2010
I keep finding packets that appear to be whois on port 44. they appear to originate from me to whois.arin.net (2 packets each time) and 199.212.0.43 (also 2 packets each time) when I put 199.212.0.43 in the URL box it says "Failure To Connect To Web Server". when I whois it it says:
Quote:
Available at [url] And yes, I did get the same packets when I used whois. Why is my computer randomly whoising stuff?
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Mar 29, 2011
where packets are stored when they're received. After some googling, I think perhaps libpcap with mmap would be the solution. Does libpcap 1.0 and above support mmap?From my understanding, mmap would allow me to directly access the buffer without having to explicitly copy the packet to another buffer for me to do processing. I would also appreciate it if someone can let me know where I can find examples of such applications, as many examples of mmap I've found involves mapping a buffer for file operations, rather than integrating it with pcap functions like pcap_loop, pcap_next_ex etc.
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Feb 21, 2010
i made a video and i wanted to put it on my myspace(video upload) and it justs fade to grey and becomes unresponive. that it goes back to normal but no progress. so then i tried going to image shack and uploading a picture. can't do that either. tried mediafire, videos, vimeo, nothing.
so i tried on my desktop(desktop running 9.10 32 bit. laptop(the first one i tried) running 9.10 64 bit. it didn't work on that either. i know it's not my isp because it works on my ps3(no ubuntu). not my firewall and tried without without my router. didn't work either. i tried upgrading flash on both of them and on my desktop i can upload some pictures to imageshack now. nothing else though. i have tried using both firefox and opera.
i pinged yahoo and this is what i got:
6 packets transmitted, 6 received, 0% packet loss, time 5007ms
rtt min/avg/max/mdev = 72.732/73.437/75.024/0.761 ms
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Oct 24, 2010
i run right now digikam and rebuild my thumbnails. It seems like that this task takes a lot of cpu power and its not digikam itself, rather xorg takes the load. Is this right? I just wonder.
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Mar 13, 2010
I installed openbox and pcman on my old desktop and was able take the desktop ram load from 275mb to 120mb. (openbox, pcman, kupfer, gnome-panel) I was so pleased with the increased headroom and performance that I wanted to do it on my macbook. Usually my macbook has as desktop ram load of about 350mb... which I find excessive as that is heavier than OS X. That's running gnome, nautilus, compiz, and gnome-do at startup.
I performed a similar procedure today to create the same setup on my laptop and... strangely, my ram usage on the desktop is still close to 300mb! I've brought up system monitor and added up the ram of all the processes it detected myself and it only added up to about 50mb. How is it that my desktop is still so heavy in a minimal environment?? (both machines are Karmic 9.10, by the way. The desktop is hardwired to the internet while my laptop uses Wicd)
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Oct 25, 2010
I just want to tell laptop users how they can protect their hdd from heavy load cycle count (spin up/down of the hdd) when using battery.If you are not sure then just type this command several times in interval of 1-2 minutes, and you will see how much the hdd head spins down, and up: Code: sudo smartctl --all /dev/sda | grep -i load_cycle.Change /dev/sda with appropriate hdd path for your pc.
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Oct 26, 2010
I have recently begun contributing to the Folding@Home distributed computing project. Due to oversights in the application's design and to process the most advantageous work units, I need to run this command line app through wine. The application is very CPU/RAM intensive, but it does not put much load on the hard drive. It is multi-threaded and uses up to 100% of all 6 cores in my machine. I run it with a "nice" level of 19 with hopes that it won't slow down my normal desktop use.
Here is the problem... when running this setup, my system will frequently freeze for a fraction of a second and then resume. With the more complicated work units, this can happen 1-2 times per minute. During the freeze, the mouse will stop moving, videos stop playing, music pauses, etc. The system is completely unresponsive. However, each instance only lasts for a very short time. Since this happens so often, my productivity is negatively impacted (and it's very annoying).
I previously ran the native Linux version of F@H without this problem, but that was also processing much less complicated calculations. I have tried with wine 1.2.1 and 1.3.5 with the same results. The application does not have problems running on Windows. It has been suggested that the current Linux CPU scheduler is to blame, but is there anything I can do to resolve this now or work around it?
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Feb 24, 2010
Is there a way to switch a internal card slot from /dev/mmcblk0** to /dev/sd** ? I'm backing up (via rsync) an ebook directory (1.9gb) to sd card and get massive i/o errors, card turning read-only,etc. This is via a built-in slot on a toshiba laptop. When I use a card reader, the card attaches to /dev/sdd1 and all is fine.
This is a new Sid install. The laptop's card slot worked fine under Ubuntu 9.04 and still works if the amounts of data are small. All I can figure is that the mmcblk device dies under a heavy load...
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Feb 22, 2010
I',m executing ping, but it didn't work, in order to find the mistake in my network I would like to know how to see the errors:
Code:
18 packets transmitted, 0 received, +12 errors, 100% packet loss, time 17038ms, pipe 4 I want to see this +12 errors. Could I do that?
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Jan 29, 2011
I have a Broadcom Corporation NetXtreme BCM5721 network card on my server at work.Everything works fine for a few weeks, then randomly the network connection on the server will stop working. After it stops working, I will try to reconnect with the network manager, it shows a wired connection available, it shows the "connection in progress"animation, then the "connection disabled" icon.
I uninstalled the network manager and used manual configuration, but do you think the network manager was the issue? I can't have the server disconnecting randomly every few weeks with no way to know what the real problem is. Was there an issue with the network manager with 10.04?
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Aug 30, 2010
i need to write a program in c that can sniff packets from Ethernet and distinguish RTP packets from Non-RTP packets, i have no idea what should i do
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Feb 8, 2011
how to fix this error: I wanna compile a C program which niffs the network for arp packets and prints them out ,I keep getting this error:
undefined reference to `pcap_parse' I have installed every thing new version of pcap ,..
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Jul 25, 2011
I have users using Windows XP, Windows 7, Linux (Fedora) and Mac. They all are in a single private network and all access internet through a Linux (RHEL5) system in which Squid acts as gateway. The same is true with my branch offices too except that private network is different and gateway system uses Fedora 9 instead of RHEL5. All the branch offices are connected through point to point leased lines with the head office for file transfer.
My requirement is this: I have a web server located at head office. Presently I am able to access this server from my branch offices through internet. I would like to access this server from branch offices through leased lines. This too I am able to access if I do routing in users system. The file transfer is taking place through one to one system at two ends by creating static routing in those systems.
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Oct 24, 2010
After first installing Fedora on my computer, I was having a problem with my programs hanging for about 10-20 seconds, and then starting working again. After a while I discovered that every time it happened, there where some disk activity, and when the disk activity stopped, the programs started working again. The problem also occurred, when I was copying large files. Then the programs would hang until the copy was finished.After some googling around I tried to change the scheduler for SDA from cfq ro deadline, which seemed to solve the problem.
However the problem still seems to occur, if I do something that requires heavy network activity. If I copy a large file from one computer to another or download something using Vuze, all programs becomes unusable until network activity stops again. have 2 computers, which both seems to have the same problem (AMD X2 3800+ and Intel Core I5 750). They are running Fedora 12 and 13 both 64 bit. Both are using Asus motherboards with onboard LAN
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Jun 5, 2011
so I've scoured the web and I can't seem to find anyone else having this issue. The issue:
Whenever my box is heavily using the internet, it seems to just wimp out. It shuts off and reboots.
When it's happened:I first deduced the connection to the network connection when I was trying to set up the system. When I tried an upgrade after the first time I installed the system, it crashed, leaving me with broken packages and all kinds of mess. So I decided to start over, and since I then had the network set up, I used the install latest version feature in the installer. If failed again. I battled issue this a couple of times before I opted to do updates in chunks instead of all at once. Success. Then I tried to download an entire website. You see, I had bought the computer to use as a test server for work. I ran wget, I believe. After a lot of recursive downloading, it decided to take another unauthorized break.
Now, I've got a minecraft server running too. It's been working pretty nicely, until lately. I've got a cron job set up to backup the server files with dropbox. Bad, bad, bad. The computer started acting up again, shutting off and rebooting. I figured it was having a hard time uploading to dropbox while simultaneously serving up the game. I moved the cron job from hourly to daily, and haven't had issues all day. Great. Until late tonight. It did it again while we were playing. It's relentless. So I went through the whole process of assessing damage. Luckily no damage. Then I went ahead and ran the dropbox script that didn't get to run while I was performing diagnostics.
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Feb 3, 2010
My network interaces stop working after 5-10 minutes of operation. I have 2 network cards, one static IP and the other dhcp. Sometimes I can ping my router, other times I can't.
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Aug 9, 2010
I'm looking for an open source/free network emulator tool that I could use on Mac OS X, to simulate a slow network connection, limited bandwidth and other network characteristics such as dropped packets etc for both UDP/TCP connections (or even on the physical layer).
I'm looking for the simplest solution that would allow me to run TCP/UDP servers and have a few clients connect to them on localhost emulating various network connections. I'm mainly wondering if I can use something like Linux's netem on Mac OS X (or even better cross-platform Windows/Linux/Mac). Perhaps I can run VirtualBox and a Linux kernel running netem, has anyone had luck with that?[URL]...
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May 4, 2009
There is a tool appeared in repository called ktune; The purpose is to adjust some sysctl.conf settings to improve server speed on servers with heavy load. What is this tool for if one can achieve the same with the configuration file added to system startup? Or ktune is just such file?
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Mar 9, 2011
I am using tcp for data transmission between 2pcs running linux.During transmission, I have noticed that if I unplug the network cable and reinsert it quickly,connection is not lost(same as i expect)and the sender start to resend the packet after 5s(what i expect is that network packets sent immediately after quick physical disconnect and reconnect).My question is can i reduce 5s to 0s(resend immediately after network cable reconnect)?Any parameters(tcp rto,txqueuelength,..) can be modified to achieve this condition?
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Feb 20, 2011
my system info is
root@ubuntu10:~# uname -a
Linux ubuntu10 2.6.32-29-generic #58-Ubuntu SMP Fri Feb 11 19:00:09 UTC 2011 i686 GNU/Linux
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May 21, 2010
I'm running puppy linux and my wireless works for about 10 minutes before crapping out. Then I tried going thru the internet wizard again and it won't detect my wireless connection. All my other machines are using this connection at the same time with no problem. The situation is temporarily resolved when i reboot.
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Oct 26, 2010
i am using RouterTik OS as my edge router. My clients are connected to one of the lan card of this router PC. One of my client has MAC book. He can discover all the clients connected to that lan card. How can i restrict my clients unable to discover each others?
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Feb 8, 2010
i have a linux server runnig oracle applications. i need to access this server from putty using ssh through internet. i did by registering my static ip with the dnydns.org and i am able to connect to the server. but now there is no security to authenticate any user as any one knowing the password can login to it.
i thought of configuring the firewall of linux server but the client ip`s are not static and they change continiously. so thought of keeping one more pc between the server and the router which will do the work of authenticating. but i am confuse as how to configure it to allow the packets coming from the internet after authenticating and to by pass the packets generated from internal LAN?
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Apr 28, 2011
I have a windows computer that has a virus on it. This computer isn't worth much so I don't want to get a virus program to clear it. I know the virus probably won't be able to crash the linux OS, but will it be able to transfer itself to flash drives if I am running linux?
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Dec 14, 2010
I played with awn for a few days on xfce. I came back to xfce4-panel. Now, every time I startx, I've got the error popup: Starting avant-window-navigator. Warning: Screen isn't composited. run compiz or another compositing manager.
I looked in the .xinitrc and can't seem to find any mention of awn or avant. How could I stop it from trying to load. I could tick "Don't show this message again", but it doesn't solve the problem. I could also uninstall awn, but I'd rather solve it properly.
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Jun 11, 2010
I played with awn for a few days on xfce. I came back to xfce4-panel. Now, every time I startx, I've got the error popup: Starting avant-window-navigator. Warning: Screen isn't composited. Please run compiz or another compositing manager.I looked in the .xinitrc and can't seem to find any mention of awn or avant. How could I stop it from trying to load. I could tick "Don't show this message again", but it doesn't solve the problem. I could also uninstall awn, but I'd rather solve it properly.
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