General :: Unexplained Log Cruft And Possible Dropped Packets On WPA2-Personal LAN
Sep 12, 2010
I've been receiving a LOT of log cruft ever since I installed my WUSB100V2 (using the rt2870sta community driver from the Linux kernel) and was wondering what it all meant.
Many times when these messages occur it is accompanied by slow network speeds and many DNS queries and outgoing SYNs being dropped. I have searched for documentation for these (error?) messages and have come up empty as far as what they mean or how I can stop them from occurring.
I reside on the opposite side of the building from my WAP. I have taken steps to improve the signal strength, but the signal quality hovers between 50% and 70%, sometimes dropping to 40% for unknown reasons.
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]...
I was using Fedora 14 for some months and my wireless was working fine. I've set up a hidden network with WPA2 Personal authentication. My laptop has an Atheros AR2413 802.11bg NIC and my modem/router is a Topcom Webracer. Yesterday I upgraded to Fedora 15 and I can't login to that network now. The only way to login again is to boot with the old Fedora 14 kernel that still shows up in my grub menu.I've searched this on these forums there are plenty of people with the same problem but the only suggestions are that the network card isn't supported by Fedora or the network card doesn't support 802.11bg.some suggest changing the authentication method in the router... and the only one who got it solved was by rebooting the router... None of this addresses the fact that the same hardware/network was working just fine in Fedora 14. And I still can't find a way to have a wireless WPA2 connection with Fedora 15.What can I do to fix it?
One of our RHEL 5.3 servers has trouble about 30% of the time with TCP-based communications, but it does not seem to be firewall issues. From another computer on the same switch, you can SSH to the server sometimes and other times the SSH command will just hang. When it hangs, you can often just Ctrl+C and try it again and it works. Same with HTTP connections. You'll get part of a web page and then FireFox will just hang waiting for the rest and eventually time out. Same goes for communication initiated FROM the server. SSH'ing from the server to any outside server or connecting to any web site works sometimes, but most times not. iptables if off. No other firewalls are running. Tcpdump shows communication gets so far and then stops. It does not matter whether tou run tcpdump on that server or the client connecting to it. Either way you see the connection stops working. MEANWHILE, pinging with small or large packets works flawlessly. 10,000 packets, zero drops.
I've recently installed Ubunter 9.10 Server Edition to use as a NAT firewall for the lab I run. I'm using iptables to do NAT forwarding and everything works great except that, occasionally, connections seem to break. Ssh connections close with "Connection reset by peer" and HTTP connections just stall out.I believe this has to do with the firewall's internal network interface occasionally dropping packets.
I am using ubuntu 9.10. Configuring my firewall using guarddog. I have setup a rule to allow traffic OUT on port 7078 UDP, and just because i'm having problems i added an IN rule.
# Create the filter chains # Create chain to filter traffic going from 'Internet' to 'Local' ipchains -N f0to1
I've run into a of a routing issue pertaining to packets leaving a firewall, traversing and IPSec tunnel, hitting the target and then returning via a different tunnel, finally arriving back on the source firewall but on a different interface from where it started. Once the packet has returned to the firewall it is dropped I've been unable to discover the reason for the drop. Two sides to the system, Firewall A and Firewall B. Each firewall provides the default gateway to its respective side and offers a backup IPSec tunnel to the high capacity tunnel handled internally. The Layer 3 Switch uses OSPF and takes care of the bulk of the behind the scenes routing between the sides. In case of failure the Layer 3 switches direct traffic to use the Firewall tunnels to route traffic.
I'm running a Debian Squeeze 6.0.1a box that's connected to my ISP via an L2TP connection that's managed by OpenL2TPD. The box is configured to perform NAT from local clients (on eth0) to the internet (on ppp0).
However, I'm having an issue with TCP packets that are sent from the box itself to the internet (packets originally coming from the local clients get sent and received over the internet just fine)
I'm using this Python app to test this:
Code: #!/usr/bin/env python import socket, time s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.bind(('', 5003)) s.listen(1) while 1: conn, addr = s.accept()
I am trying to figure out what command to use to show the number of DROPPED and INVALID packets that the firewall is handling.I'm going to put these commands into a log analyzer script which will run every 15 minutes with cron. The firewall is running and operating the way I want it to. I'm running CentOS 5.4.
I updated to the latest version of Ubuntu and before I could connect to the network "krafft" that is a WPA2-Personal protected network.If I go into Windows and change security to none I can connect with Ubuntu, but not when it's protected.After a bit of time logged in without network a dialogue pops up and looks almost like this :but "Focus" is replaced with "krafft" and the password is something else.I know that the password is right and the network worked perfectly before update.I got an USB wireless network receiver from D-Link and the chipste is ralink rt2870.In the previous Ubuntu distribution you had to write "blacklist rt2800usb" in /etc/modprobe.d/blacklist.conf but it won't work with or without that blacklist.When I updated I saw some message about the network manager(at least I think so) so maybe the problem is in that.
In my Fedora13 machine, while in mobile broadband, i can ping and skype outside, but cannot browse/yum etc. Few output that may be of relevence are here:
$ netstat -s IP: 149468 total packets received 6 with invalid headers 16174 with invalid addresses 0 forwarded 0 incoming packets discarded 118821 incoming packets delivered 101331 requests sent out 124 outgoing packets dropped 866 dropped because of missing route .....
with my other ethernet card problem solved, I suddenly run into this:
Code: eth1 Link encap:Ethernet HWaddr 00:02:e3:16:37:4c inet addr:10.0.2.1 Bcast:10.0.2.255 Mask:255.255.255.0 inet6 addr: fe80::202:e3ff:fe16:374c/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
[Code]...
This card was working perfectly fine up until....an hour ago and it started doing this. My iptables isn't blocking it somehow, because I didn't change anything. I tried reverting to an older kernel and that didn't help. It's not the network cable, it works fine in any other card. Also, the dropped packets seem to count down? It seems to go down by exactly one every time I run ifconfig, no matter the length of time in between running it.
I switched over to Fedora a couple of days ago. I'm using the built-in firewall shipped with it but I can't find out how to enable logging of dropped packets. Among others I'd like to use psad that needs firewall logging. Is there an easy way to do this? I'm not an iptables "expert".
As is known, there is a queue lies between the kernel subsystem and the network driver for incoming data. And if data come when this queue has no space for it, the data got dropped by kernel. Is there some way to see how many packets are dropped due to this buff penury? I tried netstat -s but could not find something useful. On the other hand, I found this 12176 packets collapsed in receive queue due to low socket buffer from netstat -s. I think this is something related to the per-socket buffer, but not the incoming queue between the network driver and kernel. Is this right?
my NIC drives me crazy and I need some help to gather all relevant informations to file a decent bug report. Maybe someone could guide me through this process.My mainboard is an AsRock Z68 Pro3
[URL]
I use a dual-boot setup with Windows7 installed in parallel to Fedora 15-x64. Whenever I had Windows in use and jjust reboot the system into Fedora, the NIC does not work as expected. Instead it goes in an endless "em1: link up" loop which results in very low bandwith or even complete network timeouts. This happens in Firefox as well as with yum or ping.
Quote:
Originally Posted by dmesg [ 58.763294] r8169 0000:05:00.0: em1: link up [ 59.686773] r8169 0000:05:00.0: em1: link up [ 61.936454] r8169 0000:05:00.0: em1: link up
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If I directly cold boot into Fedora (after the power cord has been removed and the system got completely re-initialized) there are no problems at alll and I get a fast and stable network conection. This also happens with other linux distributions, for example SysRescCD.
I've been having the weirdest problem with some aspect of my operating system: This is a screenshot of Google Chrome 11.0.696.57 running in Linux 2.6.37.6 with Xorg server 1.9.5 with the FGLRX display drivers 8.841 on a Radeon HD 4870. The display drivers, kernel and X server were not upgraded before this started happening. I have also not modified my xorg.conf.
As you can see, the red pixels show up just about anywhere a bitmap is changed. It has been happening in every program and not just the browser. Sometimes they flicker, always appearing at random.As far as I can tell, the Linux TTY (outside of X) is not affected. The fact that this is capturable in a screenshot rather than just appearing as pixels on the screen is what puzzles me. If you have any information as to what might be causing this, and hopefully how to solve it, (or even a theory) please post below.
Other information:
Slackware 13.37 Running Fluxbox 1.3.1 My /etc/X11/xorg.conf
Edit:Switching TTYs (via ctrl-alt-F[1-9]) and back seems to dissipate the effect, at least temporarily.
Can anybody tell me how to compile Kid3 without the TunePimp, Musicbrainz, and MP4 cruft? I don't feel like descending into dependency hell for the sake of stuff I'll never use. In KDE3 I could just execute ./configure with a bunch of --without statements. With KDE4 it just says to run cmake . and then make. For the life of me I can't figure out the way to handle this.
I'm trying to sync a folder between my Windows install and my PCLinux install. Same machine, Windows 7 on the C drive and Linux on an external USB hard drive.
Using the Grsync GUI, I searched for the source and destination folders, and then executed the command. Here is the output:
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?
On the postfix mailserver of our company I'm seeing several of these messages in the deferred queue (apologies for the terrible formatting, I couldn't get it any better) code...
looking at the headers, there is probably something wrong with our DNS-server, which we will investigate, but I still have some questions about the failure notice:
- why are the failure notices refused? Is that a fault on the sender side, for example sending the wrong return address?
- where does this mxcorp1.pacific.net.sg[192.169.41.21] come from anyway? I don't see it anywhere in the headers.
Anyone knows how to configure wpa_supplicant.conf for ad hoc mode using wpa/wpa2 encryption...Is wpa_supplicant will work wpa/wpa2 encryption? I tried many ways but i am not able to configure for adhoc mode in wpa_supplicant using wpa/wpa2
I've got a Toshiba Satellite L25-S199, and it includes an Atheros wireless NIC based on the AR2413 chipset, I believe. Currently I'm running OpenSUSE 11.4 on it, but I've previously had Xubuntu and Ubuntu, and this problem has always existed with WPA2.
Specifically, the LAN is a wireless WPA2 with AES encryption (no TKIP). The computer can connect to the network just fine, but the web is all but unusable; it is very finicky, mostly failing to fetch any pages, but sometimes succeeding (mostly with Google pages, and those from the local network's servers). Perhaps a DNS issue?
This problem doesn't occur with WEP or no encryption.
Here's the output of lspci
09:04.0 Ethernet controller: Atheros Communications Inc. AR2413 802.11bg NIC (rev 01)
I'm trying to connect to a new router that has WPA2-PSK encryption.In the connection window Ubuntu presents when choosing the network from the wifi menu, there are only the 3 WEP options (40/128 bits, 128 bits, and dynamic) plus LEAP. But no WPA2-PSK or any other WPA..I know for sure my router is set to WPA2-PSK and not to WEP.
I'm relatively new to Linux.My netbook ran updates yesterday for Ubuntu and now I am unable to reconnect to wireless network connection.I am using WPA2 encrypted security.I am able to connect via wired LAN. Also, when I went to connect using USB mobile connection, I get an error "unable to mount location". I get the same error if I try to connect my external CD drive. I have tried to force mount but no luck.
