Ubuntu Networking :: Added Some Loopback Ip's And Strange Behaviour Ensues?

Feb 7, 2010

I added the following lines to my /etc/rc.local file:

ifconfig lo:0 netmask
ifconfig lo:1 netmask


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Ubuntu :: Rename Strange Behaviour After Upgrade To 10.10?

Oct 16, 2010

Today I upgraded from 10.04 to 10.10 and I notice that the rename function is different from before.
Now it select all the filename including the extension while before it select only the filename. How can I fix this problem? It's very uncomfortable rewrite the extension everytime or remove the extension from the selection.

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Ubuntu :: USB External Disk Strange Behaviour?

Jul 19, 2011

Whenever I remove my external Freeagent Go USB external harddrive my mouse and keyboard stops responding and all I can do after that is hard-reboot pressing the key on the cabinet.It happened when external harddrive was connected while a powercut, though drive works fine when ever I disconnect it mouse and keyboard stops functioning and I have to hard reboot machine again.

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Programming :: Sed Strange Behaviour With Line Including Backslash?

Jul 1, 2010

I have a small script that takes input from one file, and uses this input to do a find/replace (with sed) to make an executable snmp trap.The input file could look something like this :JOHBURG SOUTH AFRICAOSLO NORWAY..etcThe script takes the input from this file, and preserves all words in one line as a variable (so that the variables are "JOHBURG SOUTH AFRICA" and "OSLO NORWAY", instead of JOHBURG, SOUTH, AFRICA, OSLO, NORWAY.This is working ok (in the given example, I get two variables).sed is supposed to take this variable, and use it to substitute "HITME" with the new variable.

cat tutticodes | while read LINE


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OpenSUSE Hardware :: Synaptic Touchpad In 11.3 - Strange Behaviour With Dragging And Middle Click

Jul 19, 2010

One strange and little annoying issue I notice with my openSUSE 11.3 installation is my Synaptic touchpad behaves way too strange.... Dragging a window or icon - half way around - a click is generated (probably a middle click I guess) and I need to re-drag it again.... In the browser when I try to select a text - again by dragging - a middle click gets generated... The same happens when I use gvim in visual mode too - I end up pasting the code I had selected halfway because of the middle click....

Middle click can be generated only if I press both left and right click buttons - which I'm pretty sure I'm not.... I tried playing around with the touchpad settings but no good.... I'm not able to find anything related to the middle click on the settings application... My touchpad works fine in Ubuntu and was in 11.2 as well.... Yes it works fine in Xp too.

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Software :: Strange Cent OS 5 Behaviour On Failed Software Raid Device?

Oct 26, 2010

I've got a simple software RAID1 configuration (2x250gb disks) running on Centos 5 where one of the devices appears to have failed.Whilst the system is continuing to run, the ext3 filesystem on the raid device has been placed into read-only mode Is this normal behaviour? As one of the devices is still operational I can't see why this should have happened. Can anyone explain what may have caused the OS to do this?Output from /proc/mdstat is:-

Personalities : [raid1]
md1 : active raid1 sdb2[2](F) sda2[0]


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Ubuntu Networking :: Wifi LED Behaviour Incorrect - Blinks Between Orange And Blue

May 13, 2010

I'm having a bit of trouble with my wifi. Every time the network has activity, it blinks between orange and blue. The normal behaviour of the LED is to be blue when wifi is enabled and orange when disabled. Often it blinks rapidly between the two, sometimes appearing white the change is so rapid. You can see how this would be annoying (as well as raise some concern over the life of the LED's)...

I'm running Ubuntu 10.04 64-bit. My computer is an HP Pavillion dv7 1135nr. Wifi hardware specs: Realtek RTL8101, Atheros AR5007.

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Networking :: Cable Disconneciton Eth0 And Eth1 Behaviour

Mar 10, 2010

I need to have the configuration showed on the attached file. I have two machines, one PC (ubuntu 9.10 ) and one embedded CPU with a tailored linux version starting from 2.4.31 linux kernel with Busybox running on PPC architecture.

PC address is

On CPU board I have two ethernet interfaces with addresses :
eth0 netmask
eth1 netmask

PC sends messages alternatively to and to .Between two machines there is an ethernet switch to allow messages flowing.

I use ping (from two shells on PC I ping the two addresses on CPU) to simulate messages from PC to CPU and I see this behaviour:

Starting from a situation in which CPU responds to the pings I try to disconnect cable connected to eth0 on CPU. I cannot see any interruption on ping reply on the eth0 port. If i reconnect the cable on eth0 and I disconnect cable on eth1 there are no reply to the two pings (neither from eth0 nor from eth1). It seems that all data flows on one cable just because the addresses are on the same subnet. Is this right?

If this is the right behaviour how can i separate data from PC to CPU in order to force packets to flow on two cables and avoid this sort of internal routing beetween eth0 and eth1?

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Ubuntu Networking :: Loopback Interface Not On Startup?

Apr 20, 2010

I own an Ubuntu Server 9.04 on a remote dedicated server. Since a few days (?) the loopback interface is not 'up' on reboot : I only have eth0 (which works fine).Here is my /etc/networking/interfaces (did not change since server initialization):

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface


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Ubuntu Networking :: How To Enable Loopback Connections

Aug 22, 2010

I run a webserver Apache2, php5, and MySQL. They are all set up correctly and I can access my website at [URL] I have, also installed, noip2 to update my IP address to no-ip.com for my domain name. Here's the problem: I can access my website through that domain name on other computers, both on internet and on the same network. But I cannot access it from my own computer (using the domain name instead of localhost). I need to be able to access the domain name on my computer because some pages on my website have been defined as the address to my domain name and not localhost. I cannot change this to localhost because if I do then people outside cannot work the webpages correctly. I had the same troubles on Windows before and I simply enabled loopback connections by typing in my private IP address along with the domain name into the Windows hosts file. I use version 10.04.

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Ubuntu Networking :: Setting Up Work Loopback Server

Mar 24, 2010

I'm setting up a loopback server for work related testing. I have a small program that needs to be executed through telnet from about 200 IP's on the same network. On the server, I have to set a static ip, enable telnet login, and place my 2 program files in the appropriate folders so it will run. I have been on this for 2-3 days and haven't got far.

My /etc/Network/interfaces file is this...
Auto lo
iface lo inet loopback

The rest of terminal is filled up with these, and it states that the file only has 32 characters. I don't know if this is a privilege issue or not. I've read several threads on telnet, and lots of arguments about ssh, but I can't run ssh, so I need to enable telnet. There is not a security issue. I run a private network where the only valuable resource would probably be the text file with my IP address on it. Its also accessed by people that have very limited networking knowledge and no linux knowledge...

Set static IP
Setup telnet server...
Any takers?

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Ubuntu Networking :: Loopback Won't Work When Not Connected To Any Network?

May 6, 2010

I'm using Wordpress on Apache localy to keep a diary (it's convenient because of the tags).
When I'm connected to any network (be it wired or wireless) my Apache (and Wordpress, of course) works just fine. But as soon as I go offline, I can't access the web server neither through browser nor by telneting to the 80th port. Pinging localhost works just fine.Here is my ifconfig when offline and when online:Online:

eth0 Link encap:Ethernet HWaddr 00:24:54:6f:07:aa


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Ubuntu Networking :: Nat Loopback - Get The Sever Viewable To Everyone Outside Of My Network ?

Sep 1, 2011

So I have an Ubuntu server setup but my modem from my ISP only has one ethernet port so I have to run my server behind a router. I have been able to get the sever viewable to everyone outside of my network but when someone is inside my network they have to view the server by the direct IP the web address doesnt work nor does the actual static IP. I believe this is something to do with my router not being able to loopback. It is a belkin N600 DB.

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Fedora Networking :: Loopback Mtu 16436 ?

Oct 12, 2010

Why does the loopback interface has such a high mtu? I get it that it needs to work out even large packets, which is logical but why this specific number? I can set the MTU even higher with the ip link command, so it's not a limitation of the variable used.

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Networking :: Pseudodevice And Loopback Device ?

Nov 22, 2010

The concepts of pseudodevice and loopback device ?

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Networking :: Communication Without Loopback Device

Jan 13, 2010

I have two ethernet card on my computer, I want to make a TCP or UDP communication between these two cards, so I disable loopback: #ifconfig lo down. but with out loopback I can't even ping an eth from another one. how should I do? I want traffic to really pass eth cards.

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Networking :: Ipv6 Loopback Configuration

Feb 15, 2011

I have a server application that uses loopback addresses to open servers on linux machine.

For IPv4 with one line of configuration I can open many servers according to the mask I use for example with I can open 254 servers.

How can I do the same for IPv6 ? I am able to add loopback interfaces but only for one host. Is it possible to add for a subnet ?

If not what is the max number of addresses that I can add ?

I also saw that it add the address only to loopback lo and I can add it to lo:3 for example.

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Ubuntu Networking :: Network Tools Defaults To Loopback Interface

Jul 22, 2011

I'm running Ubuntu 11.04 and I've been unable to access any type of Internet service besides web browsing. When I check on Network Tools, it's always set on Loopback Interface, regardless of whether I've just switched it to Ethernet Interface. I haven't been able to download system updates through Update Manager. I'm not very experienced with Ubuntu.

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Ubuntu Networking :: All Wireless Stops Working If Loopback Is Enabled In Router?

Jun 8, 2010

I'm running a Source Dedicated Server on my Ubuntu laptop, and to connect to it via external IP from other computers in the network I need to enable loopback in my router.This was working fine, but then I disconnected my laptop for a few days, and when I came back the wireless stopped working on my Xbox. I reset the router to factory defaults, and then setup everything again. It was all working fine until I enabled loopback again and power cycled my router. Now every time I do that, the internet on Ubuntu stops working and the wireless on the Xbox stops working.

Edit: You can ignore this I guess. It seems I was actually DISABLING loopback by enabling that router option, which I guess caused this. Strange, because the first time enabling this option was the only way to get my external ip to work. Oh well, everything is fine now.

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Networking :: Pppd Nomagic To Stop Loopback Errors?

Oct 16, 2010

QUESTION: Where do I add "pppd nomagic" to stop analog modem loopback errors? (I am using Gnome PPP.)BACKGROUND INFO:I am using Ubuntu LTS 8.04 on a laptop and have an analog modem connected via USB serial cable. The 8.04 dialup and the analog modem work flawlessly.Modem disconnects when using Ubuntu LTS 10.04.1 Live USB:I am testing LTS 10.04.1 on a live USB drive that I purchased preinstalled from On-Disk.On the live USB drive, I am able to get a dialup connection with my ISP long enough to pull up a web page with the browser. However, the analog modem disconnects within minutes with exit codes 16 or 17.an pppd:16 The link was terminated by the modem hanging up.The PPP negotiation failed because serial loopback was detected.

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Networking :: Will Bringing Down Loopback Interface Make Whole Server To Go Down?

Dec 14, 2010

I have a client's linux server where someone added a script which sends spam mails from the server's local loopback address ( all my seniors worked on it and couldn't trace the script on the server this issue was going for a week, now I have an idea to bring down the loopback interface of that particular server(ya, that was not a permanent solution but just had an idea), but my support manager told that it will bring the whole server down(so far as i have learn't loopback address is used only for testing the NIC card's functionality), is that really bring the server down.?. How ever i tried this using a test machine all the connections works fine even after i bring down the loopback interface. As my client's server is a production server i can't test it there without clear knowledge, can any one help me out whether will it bring down the server or will it cause any side effects on it(i know that you guys are experts so i am asking it here)?

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Fedora Networking :: Wired Connections - Shutting Down Loopback Interface

Jun 22, 2010

I have a problem with my F13 and wired connections on my Acer TravelMate 2410. When I connect the inet cable it doesn't show it as connected. When I type ifconfig, it shows everything as it should. When I tried to bring up eth0 with ifup eth0, it said that the device is not managed by NetworkManager. I tried to restart nm with service network restart, but it gave this error:

Shutting down loopback interface: Error org.freedesktop.NetworkManagerSettings.InvalidConn ection: ifcfg file ;/etc/sysconfig/network-scripts/ifcfg-lo' unknown

The same error came up for eth0 and Wired_connection_1 (the connection I configured from NM )
When I typed nmcli dev list it gave me:

GENERAL.TYPE: 802-11-wireless
GENERAL.STATE: disconnected

GENERAL.TYPE: 802-3-ethernet
GENERAL.STATE: unavailable

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CentOS 5 Networking :: Slow System Due To Hostname Loopback Address?

Jan 12, 2010

New CentOS 5.4 system working fine. Sys admins came in and copied the hosts file from one of the servers down to my desktop and ever sincethen machine has been slow (progs take 10-20seconds to load). RunningGnome. Luckily I saved the old hosts file and copied it back and all is now well. But I'd like to understand why, particularly as I will need to change myhostname in the future.

As configured:
/etc/hosts (yes my hostname is "dummyName" that I will need to change later) dummyName localhost.localdomain localhost


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CentOS 5 Networking :: Add Extra Loopback Adapters Like Windows - For GNS3 Router Emulation

Mar 26, 2009

I have been searching the forums for quite a while, to add extra Loopback adapter in Centos 5.1, but no success! Could you please suggest me the steps? in Windows, it is quite easy to add as many adapters as you want. wondering, if this is even possible in Linux? I have to run GNS3/Dynamips for router emulation and bind those Loopback adapters to virtual routers!

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Ubuntu Networking :: Added Memory Lost Internet

Apr 16, 2010

I added RAM to my Acer (dual boot Windows XP / Ubuntu 9.1). Windows continues to work. Ubunty will no longer recognize the internet connection. I don't know if adding the memory is what did it, but I am puzzled why I can use the ethernet card from Windows but no longer from Ubuntu.

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Ubuntu Networking :: Strange Connection On Windows 7?

Apr 23, 2011

At my grandparents house, there is a Wi-Fi network that we can (sometimes) connect to. However, it lately hasn't been allowing our Win 7 laptops to connect. It does let my Wii and my iPod Touch connect with no problems. I've tried restarting, but that doesn't work. We don't have access to the router, so we can't reset that. I would really like this fixed since mobile Safari is not the best browser in the world and WiiNet is even worse..

Note: Neither of the laptops are mine (one is my sister's and one is my parents'). I would never allow a computer of mine to use such an operating system.

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Ubuntu Networking :: NoIP Not Redirect IP After Host Added In EHCP?

Apr 10, 2010

I have a dell desktop PC that runs with ubuntu 9.04 jaunty jackalope and has 2 network cards eth0 that is connected to internet with an pppoe connection and is shared on eth1 for the other pc that is with windows on the ubuntu server machine is installed EHCP controls panel and No-IP, No-IP works fine but if I add a host as a domain in EHCP where I want to add EHCP {itself, problem appears. No-IP does not redirect to my IP after I added host in EHCP. EHCP is set to have the original IP of my pppoe and I tried with the IP and the problem is still there.

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Ubuntu Networking :: TP Link TL-WN722N Strange Connection?

Nov 2, 2010

I just installed Ubuntu 10.10 yesterday, this is my first experience of Linux so I am a noob and have no idea how to go about troubleshooting this myself. I have been googling and searching forums for ages and have read a lot of threads of people having problems getting connected but have still to find anyone with the same issue I am having.

I managed to connect without any problem and I am not being periodically disconnected (which seems to be a frequent problem) but when I enter an address in firefox or click a link there is a 20-40 second delay before it will take me to the page, but once I am on the page if I click another link it will take me there straight away (as long as I am in the same tab, if I switch to a different window I have the 30 second delay again). Same with downloading files, when I click a download link it takes about half a minute to register that I have clicked, but once it establishes the connection my speeds are the same as they always are. speedtest.net is showing 8mbps, and the last file I downloaded came through at 900kbps once the connection established. It is very irritating since other than that I am loving Ubuntu and the more I read about Linux the more I want to drop my windows 7 altogether (running dual boot just now).

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Ubuntu Networking :: Strange Behavior With Pings From Desktop?

Mar 9, 2011

I've been trying to use MySQL in Ubuntu but I've been having some connection issues and in trying to troubleshoot that, I observed this strange behavior with pings in Ubuntu Desktops inside our network.

- All Ubuntu Servers we have (10.10 and 8.04) behave as expected
- All Windows machines behave as expected
- All 5 Ubuntu Desktops we have, (10.10 and 9.10) exhibit the following unexpected behavior:

If they have a local ip addresses and are connected within the internal network, either to a switch or directly to a router, pings take much longer to be sent. It's not a higher lag, it's the time between each ping that increases. I have to wait for around 5 seconds for each ping, but the time in the ping reply is less than 100ms, also they're all in order so I assume it's the system delaying the sending of each ping.

If I plug a USB 3G modem directly then it works as expected again (~1 sec between each ping sent). Is this an intended feature, that depends on the network environment, or is this something I should look into more closely?

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Ubuntu Networking :: PC Giving Strange Results When Being Pinged

May 27, 2011

Right then... all DHCP
When being pinged from another PC aok, but also pings back on When being pinged from itself using ping (or 100) all is well - when pinged as ping PEGASUS is says following:

64 bytes from localhost.localdomain ( icmp_req=1 ttl=64 time=0.033 ms
64 bytes from localhost.localdomain ( icmp_req=2 ttl=64 time=0.044 ms
64 bytes from localhost.localdomain ( icmp_req=3 ttl=64 time=0.042 ms
64 bytes from localhost.localdomain ( icmp_req=4 ttl=64 time=0.040 ms
^C64 bytes from localhost.localdomain ( icmp_req=5 ttl=64 time=0.042 ms

The IP says its (home) WTF is going on>. Why has PEGASUS been assigned 2 ips, and when pinging using HOSTNAME why does it point to home?

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