Ubuntu Networking :: Network Connection Logging
Nov 10, 2010
Wondering if anyone can point me in the right direction to setup some form of network connection monitoring and logging?As Australia has CRAP broadband and ISP's utilize Peak & Off-Peak download limits I schedule downloads for my Off-Peak times. Well recently my connection drops out exactly when my off-peak time kicks in and requires my modem to be reset to re-establish my connection.
My ISP is denying they are doing this but I happens everyday now and is getting really frustrating. What I want to try and set up is some sort of monitoring to ping my ISP's default gateway so I can prove it drops at a specific time each day. I am sure there would be something I could configure in Ubuntu but I am a newbie to Ubuntu so don't really know how to achieve this.
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Dec 8, 2010
We have an Asterisk machine that we suspect periodically loses internet connectivity, causing all calls to drop. First, would this sort of thing be logged anywhere out of the box? I haven't noticed anything in /var/log, but that doesn't mean it's not there. If this is not typically logged, how I might go about logging it? I'm currently running a bash script from cron every 5 or 10 minutes which pings Google and writes success or failure messages to a log file. This works fine for extended outages, but if the internet connection drops and comes back between cron runs, it won't be caught.
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Oct 15, 2010
The collage I am going to has a secure wireless net work that we are suppose to be able to log into with a user name and password they give us. They have instructions on how to connect with windows and mac, but not for linux.There tech support has not been any help and I have tried quit a few different combinations but with no luck.
According to their instructions for windows their net work uses WPA-Enterprise for security type, and PEAP. They do not seem to use any root certification authorities, and they have you unchecked "validate server certificate".At [URL]there is some similar thing were you can see screen shots, but I cannot follow these because I do not know what "CA Certificate" to use. Is there a way to do it with out a "CA Certificate"?
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Jul 9, 2010
I need to setup an Ubuntu Server to handle backups over the network (probably rsync over ssh). That server will then transfer the backup data offsite over a secondary external data line.How can I configure the ethernet interfaces to handle such a scenario?
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Jan 24, 2010
Its a case of ".... wireless network connection active but still not internet connection .."I am using WEP - 128 key ... Works when I connect directly using ethernet cable ... but not wireless (pci and wireless router)
ubuadmin@ubucomputer:~$ ifconfig
wlan0 Link encap:Ethernet HWaddr 00:06:25:12:83:3b
inet addr:192.168.1.10 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::206:25ff:fe12:833b/64 Scope:Link[code].....
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Jun 22, 2009
I am currently working on a project related to packet sniffing which has been implemented using the concept of raw sockets. I am using C language.I am able to decode the following details from the packets received from a local network,like:
source and Destination Mac Address
source and Destination IP Address
source and Destination port no
But I am having trouble in decoding the domain name when an user in the local network is logging onto internet.For eg. if a user in the local network is trying to log on to web using his browser say if he has logged on to url then from the packet I need to get the following details
source Mac Address from which user had logged on
source IP Address from which user had logged on
domain name
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Mar 2, 2011
I have installed qemu/kvm and created a Bridged network connection which works just fine(Windows 7 VM won't work in NAT mode.)
But when I try to use NetworkManager it says that I have no network connection because the network isn't managed, (I set the settings in ifcfg-br0 and ifcfg-eth0 to be managed)
The real problem is that now I can't use my VPN connections (I have many) in NetworkManager.
Is there a way to have both of these pieces of functionality?
I am using FC14
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Apr 3, 2010
I installed the driver for my network card. iwconfig and ifconfig are all responsive to connecting to the network, I'm given an access point address. Then, I try to connect to a website and no dice. ping www.google.com yields no result. What gives?
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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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Oct 12, 2009
I am losing network bandwidth and I am quite frankly I am not sure why, I don't have allot memory 495.6Mib
But I clean my PC every few days "BleachBit"
I have read some where on the magazine Network receiving suppose to be higher. so how can I fix this issue please i am having allot problems, u use cable from Comcast
I am not quite sure what Information you might need from me to give.
I use Ubuntu 8.04 LTS
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Feb 9, 2010
I have 2 computer: 1 computer install ubuntu v9.10, in this computer already installed openssh-server and openssh-client, and 1 computer install windows. In computer with windows , i used putty connect to computer with ubuntu, but i can't connect. I don't understand what's error.
In the Putty , i configured:
IP : IP address of computer Ubuntu.
Port 22
Connection Type SSH
This is error: "Network Error: Software caused connection abort"
In computer with windows, i can ping computer with ubuntu and in computer with ubuntu i can ping computer with windows.
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May 14, 2010
I am trying to Setup citrix ICA client 9 on Ubuntu 9.04 Server. I installed it very easily and I am not getting any lib error also. But when I try to connect to the citrix server, it fails with a pop up saying "Error in Network Connection Network or Dialup connection may be preventing ......" This is driving me crazy from 3 days. My project is to check the feasiblity of a Linux desktop
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Oct 31, 2010
I have the "Work Offline" problem: when I boot up, the icon on the toolbar tells me I have "No network connection". This is not quite true, since I can access the first page of any website - only subsequent pages are inaccessible. I get a message saying that Firefox is offline. However, when I uncheck "Work Offline" in the File menu, it makes no difference to this behavior.
The problem is on my Ubuntu Dell desktop, which is connected to the internet with cable broadband via a D-Link router (wired connection). It has worked fine up till now. I use Ubuntu 10.04 and Firefox 3.6.11. I am writing this on my Ubuntu Dell laptop which is wired to the same router, so I assume the problem is not the router. I have tried various strategies suggested in threads on these forums, including editing about:config, changing "allow" to "deny" in some lines of /etc/dbus-1/system.d/NetworkManager.conf and changing from Automatic (DHCP) to Automatic (DHCP) Addresses only, but no luck so far. The contents of ifconfig are:
eth0
Link encap:Ethernet HWaddr 001:aa0:91:a7:51
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets: 0 errors: 0 dropped: 0 overruns: 0 carrier: 0
collisons: 0 txqueulen: 1000
RX bytes: 0 (0.0 B) TX bytes: 0 (0.0 B)
[Code]...
If I comment out "auto eth0" as well, it makes no difference. If I uncomment both lines ("auto eth0" and "iface eth0 inet dhcp") then I lose the internet connection altogether.
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Mar 8, 2010
I'm having a lot of problems getting NIS set up with our firewall. I've looked online and no one seems to have any answers. When the firewall is off, NIS works. When it's on, it doesn't.I would like to know which ports NIS needs by logging connection attempts on the server, since I would swear the right ports seem open already. Right now I'm using this to generate the log entries:
iptables -I INPUT -m state --state NEW -j LOG --log-prefix "New Connection: "
iptables -I OUTPUT -m state --state NEW -j LOG --log-prefix "New Connection: "
However, I think it must only work for successful connections, because I'm not seeing any new entries when I try running the NIS client on another machine (ypbind).
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Mar 28, 2011
I am wondering if it's possible to log the number of bytes a connection transfered when the connection is complete with iptables. I know I've seen this sort of information in Cisco FWSM logs, where the "Teardown" entry of the logs has the bytes transferred for that connection. Is it possible to have something similar to that with iptables? Where the initial connection attempt is logged (i.e. NEW, which I have logging fine) AND an entry for that connection that includes the bytes transferred?
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Oct 20, 2010
I am creating this script which will login to a server with ssh and check if a particular exists there, if not it will create the user.This is the script:Quote:
ssh 192.168.100.5
cat /etc/passwd|grep -i $1 > /dev/null
if [ $? -eq 0 ];
[code]...
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Feb 17, 2010
I have Ubuntu 9.10 installed. Been using it no problem for months. I have a Belkin wireless USB. Worked fine. Until 8 days ago. Just stopped working. During troubleshooting I also discovered that the wired connection also does not work. Rebooted, checked settings, did all that. Nothing. I've plugged the network wire into another machine. It picked up IP via DHCP within seconds proving that it's not the network. I've tried everything that I can think of. What would cause the network within Ubuntu to just stop working? Wired and wireless. The only thing I can think of doing now is to reinstall Ubuntu.
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Jan 18, 2010
I installed Ubuntu 9.10 using the default setup (Gnome I think) and on my Gateway Notebook using a wireless connection. It appears to be working great and I can even see my Windows drives and network storage on my home office systems.I have also set it up to run my favorite Bible software on Windows running under VirtualBox. I then installed the KDE Desktop so that I can select either desktop when logging on.
However, once I am in the KDE desktop, I cannot connect to the internet. I have checked and double-checked and the wireless settings seem to be the same on both the Gnom and KDE Desktops but still no network or internet connection when using KDE. I might mention that I am using the 64 Bit version of Ubuntu.
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Jan 31, 2010
I am new to Ubuntu, and I have just installed version 9.10 on my desktop PC. I need to connect my computer to my home network. Right now, I have no connection and cannot detect any of the hardware when running Ubuntu. When I switch over to my Windows XP partition, everything works fine.
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Mar 5, 2010
Hi - I am new to Linux and Ubuntu so I have no idea how to fix or problem solve unfortunately I installed Ubuntu 9.10 from scratch recently on this laptop and all was good. I connected to my WIFI network no problem. It's WPA PSK encrypted, DHCP enabled. I just set it up in Network Manager and it was all fine. Then after a few days I installed a printer and some packages and updates via synaptics. The network connection started dropping after 20 mins or so. Only a reboot would restore it - auto connects at first, runs fine till it drops then never will reconnect. I posted on here, someone gave me some lines to put in a config file. I tried that. I didn't seem to help much, problem remained. Yesterday I checked for updates and there were a whole bunch so I just installed them all. Now I cannot connect at all. I have deleted and recreated the connection in Network Manager but it doesn't help. It tries to establish a connection but never achieves it. I am connecting to the internet now on the same laptop booted into Windows, so all the hardware is fine.
Can anyone who knows about ubuntu networking help? Do I need to do a complete reinstall? Seems a bit much, but it worked when I initially installed the OS. I want to like Ubuntu, but something as basic as connecting to the internet is pretty vital so reluctantly having to start using Windows again...
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May 1, 2010
I bought a pc with ubuntu 9.10 pre-installed today. Unfortunately there's a problem with the network connection, i.e. I don't have any. The mb is a Foxconn A74ML series with onboard LAN. I've switched cables with another PC and it didn't have any effect. The other PC is still connected to the internet and the new one is still not connected. How I can/should do to get a connection?
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May 18, 2010
I'm a complete beginner who just installed 10.04. I'm trying to follow guides to setup my internet connection, but I am completely unable to locate the Network Manager Icon. I have the notification area already, but there is no icon. I tried the instructions here
After inputting
nm-applet --sm-disable
It gave me:
** (nm-applet:1722): WARNING **: <WARN> constructor(): Couldn't initialize the D-Bus manager.
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May 27, 2010
I cannot seem to stop my computer from broadcasting an ad-hoc connection. I set it up using networkmanager, but now I cannot delete it. I searched Google and ubuntuforums for an answer, but no luck
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Jul 20, 2010
I just got my first laptop, an ASUS eee pc 1201n. It came with Windows 7, but i decided to load the latest version of Ubuntu Netbook Edition on it as well.Today when I tried to access the internet via my library's free wireless service I couldn't get Ubuntu to recognize any wireless connections. I checked with Windows 7 and several networks appeared, including my libraries, but Ubuntu was blank.
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Aug 10, 2010
How ubuntu 9.10 netbook is36 activate its network connection?
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Nov 19, 2010
connect to wired LAN in ubuntu 10.04? I think I have specified the IP address and everything correctly. But it says no connectivity. In windows it says connected but I am unable to open any webpage.
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Jul 28, 2011
I installed Jolicloud OS with Windows XP before because Windows XP have too many virus to attachment to Internet so whenever I go on the internet, most of the link take us to random site so I just installed Jolicloud OS however, some reason, I don't like Jolicloud very much because it require to enter the user name and password to link Jolicloud so wasted my time to use it... Its cool but pointless.
So, I just realised Ubuntu also provided free Ubuntu OS for netbook. After I downloaded Ubuntu desktop 11.04 and installed the system (all the datas is now gone and only current OS is Ubuntu)So, once I installed it... The netbook seem running well and no problem however, there is a huge problem is wireless are not found so I can't even use the Internet!.This netbook only got wireless and nothing else to connect like cable (wired).
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Dec 1, 2015
I'm trying to use these cookie cutter rules that I found. But every time I use them, after a few seconds my wifi connection goes dead. The exception was the first time I used then. Which lasted me a couple of minutes.
By dead I mean I can no longer open a webpage or ping google.
iptables -N LOGGING
iptables -A INPUT -j LOGGING
iptables -A OUTPUT -j LOGGING
iptables -A LOGGING -m limit --limit 2/min -j LOG --log-prefix "IPTables-Dropped: " --log-level 4
iptables -A LOGGING -j DROP
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Nov 3, 2010
I'd like to essentially log the firefox status bar "waiting for x...", "transferring from x...", all those messages. Really what I'm after is a log of all servers contacted.
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Jan 5, 2010
I want a program (shell script) to be executed as soon as my DHCP connection is established successfully. Is there any way I can do this ?
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