Ubuntu Networking :: Auto Run Script Whenever Interface Connection State Changes?

Aug 14, 2010

Upon boot of my system, I auto run a script that customizes the routing table (i.e., route -n). However, after the system is already booted up and has been running, if a network connection is dropped and re-added, like if one of the several network cables to the machine is temporarily disconnected or other, then the routing table is modified -- I assume by network manager. Presently, I need to manually re-run my script to re-customize the routing table.

I would like to have the script just run whenever there is any change to the connection state of interfaces. Anyone know how to tie in some kind of event trigger that can execute a script upon change in interfaces connection state (i.e., detect change in connection state and run the script)?

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Networking :: Prevent Auto Up An Interface At /etc/network/interface File ?

Jul 18, 2011

I have a ppp0 entry with post-up options like this

mapping ppp0
map none photon-plus motorola
map timeout: 12


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CentOS 5 Networking :: Shutting Down Interface On Link Down State?

May 17, 2011

I have a problem. I want interface to shut down once there is a link down state detected. If you set up eth0, and then plug cable out, eth0 stays up, just loosing the RUNNING flag. I want it to go down completely.

I've stumbled upon netplugd, and I've tried using it. It is a daemon that detects states in (link up) and out (link down) from kernel netlink interface. If I have this daemon up, it detects that link is down (eg. cable removed from interface), and it runs correctly /etc/netplug.d/netplug eth0 out. That script then runs ifdown eth0. And that's ok.

But very next moment netplugd runs /etc/netplug.d/netplug eth0 probe, and probe section of that script runs "ip link set eth0 up", which then turns interface back on!I've tried commenting out that line, but then new problem occurs - after the link is up, netplug cannot figure that out and bring back interface. Has anyone have this kind of problem, and any viable solution with netplug?

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Networking :: Ethernet Interface Leaves RUNNING State After Some Time

Jul 29, 2011

I am using RHEL6 on a server with 3 interfaces.

eth0 is connecting via a Cisco switch to the outer world and eth1 and eth2 to internal networks.

eth1 and eth2 are working without problems all the time, however I have the following incident with eth0: although it is RUNNING, and after it works for some time (like some hours), it then becomes incapable of sending/receiving traffic. Here are more details, after the interface exits the RUNNING state:

[root@mgt ~]# ifconfig eth0
eth0 Link encap:Ethernet HWaddr E4:1F:13:6C:87:74
inet addr: Bcast: Mask:
inet6 addr: fe80::e61f:13ff:fe6c:8774/64 Scope:Link


I am wondering whether there this is because there is not traffic for some time and so the interface goes to idle. Is there any parameter I can tweak in RHEL6 to force the interface to remain RUNNING even in the absence of traffic (although I would be expecting that some 802.1 packets would be periodically flowing from the switch to the interface)?

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Fedora Networking :: FC11 Not Auto Detecting Ethernet Interface

Jun 10, 2009

On FC10, when system boots up, it would auto detect (from DHCP) and configure eth0.

This does not happen on FC11, but I can manually configure the interface. The entries in /etc/sysconfig/network-scripts/ifcfg-eth0 are identical on both OS releases.

Don't know if this is related, but when I run System->Administration->Bootloader, it fails system-config-boot - missing module kudzu.

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OpenSUSE :: Auto Configure - Reinstall To Reflect System In Current State

Apr 17, 2011

Is there a way to get a list of all packages installed since install (that are currently on the system) and upon re-install run an application that will automatically install those packages. This would save greatly on initialisation time (the re-set up afterwards). Essentially, I want to re-install and/or move to another machine and want to the new install to reflect the system as it currently stands.

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Ubuntu Networking :: Unable To Get Share Connection To My Other Network Interface?

Aug 19, 2010

I am a big ubuntu fan (9.04) installed,everything went well, installed my network card(s) & the onboard without no problems/installation disc.I have 2 Network interface(s) that I used on windows xP to 'bridge' my connection, because I only have one slot on my router, and the last slot runs into my computer room and from the PC, I run it to the xbox/ps3.No matter what I do, I cannot get ubuntu to share connection
to my other network interface.

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Ubuntu Networking :: No Auto Connection To Wired Ethernet On Restart?

Nov 30, 2010

Just noticed that auto connection to my wired ethernet is not being established after restarts I'm making. Never recall this in the past. I do get an auto connect when I shutdown and restart. I'm using 10.04 LTS Lucid Lynx.

Also have noticed that nearly every upgrade over the past week or so is calling for restart to complete the upgrade. Can there be any unwanted problems in doing several upgrades over a period of several days before doing the restart? I'd like to think not.

As you can imagine these two issues together are causing some lost time.

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Ubuntu Networking :: Auto Disconnecting Mobile Broadband Connection?

Jul 19, 2011

I'm using Mobile Broadband Connection (Huawei 180), When I plugin my RJ45 Ethernet cable, my Broadband connection is no more. I have no access to Internet. why it happens and How can i establish both connections @ once..?

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Networking :: Auto Auth Connection Doesn't Work?

Jul 29, 2011

i have wired connection(auto auth) , it was working till yesterday , but now its not working simplicity its not receiving to enter my name and password , its mikrotick hotspot .

ubuntu 11.04

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General :: Run Auto Script When Interface Comes Up Or Down On Centos?

Mar 14, 2011

i have a centos box with interfaces eth0 and lo:0. i want to write a script to stop or start lo:0 automatically when eth0 comes down or up.

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Debian Configuration :: How To Prevent Auto Up An Interface At /etc/network/interfac

Jul 27, 2011

I have a ppp0 entry with post-up options like this

mapping ppp0
map none photon-plus motorola
map timeout: 12
## map init-time: 12 # for slow drivers


If I comment those off then no such problem, hence some how ppp0 executed automatically and there is no [auto ppp0] any where. How can I stop this forcefully ?

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Networking :: ATT Uverse DHCP Not Assigning To Red Interface Interface On Smoothwall?

Feb 14, 2010

I just had an ATT Uverse RG installed. However my Smoothwall router that previously worked fine with the ADSL SpeedStream is no longer accepting an address assignment DHCP ip address from this new gateway. (3800HGV-B)Any thoughts ideas or experience working with this hardware? ATT only supports Windows and Mac

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Networking :: Ethernet Auto-connect / Auto-sense Doesn't Work

Feb 3, 2011

I have noticed that a common issue to several distros is the fact that the networking subsystem doesn't automatically detect the link if an ethernet connection is disconnected and then re-connected to the NIC after boot. If the ethernet cable is connected after the system is up and running, nothing happens - ethtool eth0 shows link detected: no, and you have to restart the network service to let the NIC know that there is in fact a link, and actually connect. I have a Fedora14 (KDE) box with a brand new Asus motherboard with embedded NIC. Everything works great except the auto-detect of a freshly connected ethernet connection if the link is down to begin with.

Am I missing a ethernet link sentinel utility or something, or is this just the way linux works? I have done plenty of research on plenty of posts, and it seems this is a common problem, with no solution other than manually or programatically restarting the network service in a script to detect the link after a disconnect.

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Ubuntu :: VNC Auto-allow Connection

Dec 6, 2010

I have a few computers set up in my room, but only 2 monitors. Therefore, I typically connect via VNC to use these computers, which works great on my local network.

My problem is that, after Ubuntu restarts, it requires the password for the login keyring before it will allow a VNC connection request. EVENTHOUGH I have it set up to automatically accept incoming connections.

Therefore, before I can VNC to any of these machines after a reboot, (for software updates, etc.) I have to connect a monitor, keyboard, and mouse, just to type in my password.

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Ubuntu :: Get Devices To Auto-mount On Connection?

Jun 2, 2010

I have many flash drives, memory sticks, card reader, and 2 mybook 1tb so i am constanly plugging in, or unplugging devices from my machine running the latest version of ubuntu (i beleive 10.04?). I remember when i use to connect a device it would mount and work right off the bat. but now, everytime i connect anything, i have to go through Disk Utility to select the drive and mount it (also unmount before disconnect). Another problem is that some times disk utility doesnt like to work (as with a few other programs). This happends every now and then and im not sure if its my systems hardware or this version of ubuntu. every now and then programs like to stop responding (turn grey) and some programs like disk utility will open up, but just be blank and not show the detected devices

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Ubuntu :: 9.04 - No Network Connection (Auto Eth0 Set To Never)

Dec 13, 2010

When I log onto my Ubuntu 9.04 boot I am disconnected from the internet, on my windows 7 boot It works just fine, I have attempted disabling networking, power cycling the modem and router, and re-enabling networking, no dice though. hovering over the connection icon tells me that there is no network connection.

Opening the edit connections window tells me that there a wired connection called Auto eth0 that is set to never, and that is all that I can find. I hunted for other forums on this and found a few but none with a successful resolution.

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Ubuntu Networking :: Get Into Network.state File To Make Changes?

Nov 8, 2010

I've recently upgraded to 10.10 and am having the same problems as with all the previous versions. I have no eth0 connection at this moment, only lo. I have an Hp pavilion about three years old with a onboard ethernet, connected to router and wired broadband. The thing is, when I am in Windows, the internet will also drop, going into "local only." I can always get that back though by running the network diagnose. Another thing. How to I get into the network.state file to make changes?

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OpenSUSE Network :: Share Internet Connection Through WiFi Interface

Jan 6, 2010

I have 2 laptop with opensuse 11.2. One of them is connected to the Internet through a Mobile Connection with a CDMA/EDVO modem on the usb port. I want to share the Internet connection with the other laptop through the WiFi interface of each of them. How should I proceed?

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Networking :: Netstat Port State IDLE

Jun 8, 2011

with netstat i found a port with idle state, i google the meaning of IDLE:Idle, opened but not bound.What do you mean by bound?

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OpenSUSE :: Can't Get Qinternet To Auto Reconnect / When Connection Is Lost

May 14, 2010

i cant get Qinternet to auto reconnect when connection is lost due to dynamic IP changes from my ISP.Im using Ifup method.Thing is, every 24 hours, ISP changes my IP and thus, disconnects me from the internet. I need it to reconnect but dont know how to do it.

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Ubuntu Networking :: Lucid Does Not Store The State Of The Enable Wireless Option?

May 29, 2010

I am using Ubuntu Lucid Lynx (10.04)I have a wireless card in my PC that I only use very occasionally so I uncheck the Enable Wireless option on the network tool icon to stop the system attempting to connect to my wireless network. That works fine for that session, but the system does not seem to remember this setting and attempts to connect the wireless each time I log in! Is this a feature or a bug? and does anyone know a way of defaulting the wireless option to off

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CentOS 5 Networking :: TCP Connections Stuck In FIN_WAIT2 State?

Jul 21, 2009

I'm developing a simple TCP server. 99% of incoming connections terminate correctly and the sockets disappear from netstat outputHowever, a few connections hang around for indefinitely in the FIN_WAIT2 state. Now, I know that the clients in this case are misbehaving by not sending a FIN,ACK to close the connection. However, regardless of client behaviour, the connections should only remain in this state for a maximum of 60 seconds (set globally by /proc/sys/net/ipv4/tcp_fin_timeout)

Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name Timer
tcp 0 0 FIN_WAIT2


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Ubuntu Networking :: Invalid State Because Don't Have IP Address But Firefox And Chorme Work Perfectly

Jun 23, 2011

Kubuntu's Network manager says that my (wired) network is in an invalid state because I don't have an IP address, but Firefox and Chorme work perfectly, as do Synaptic and Software Centre, and a Superkaramba network monitor says that my IP is "" In fact, the only thing that isn't working is Pidgin, and it says it's "Waiting for network connection."

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Networking :: Netfilter's -state INVALID Triggered By Foreign Dual WAN Routers?

Dec 22, 2010

Recently I am logging the packets that are supposedly INVALID and I found out that I am dropping a lot of packets that seem legitimate (in the sense that they are clients that are allowed to contact us).

:invalid - [0:0]
-A invalid -j LOG --log-prefix "[DROP INVALID] : " --log-tcp-options --log-ip-options
-A invalid -j DROP
-A INPUT -i lo -j ACCEPT


I would like to know If I can tell a complaining client that his dual-WAN solution is not behaving properly.Should such a dual WAN-router spoof its IP to the one that initiated the connection? And what happens if these packets are not dropped? Will they be accepted by the application or does it depend on the application? It sounds like a security risk if it does. It seems to me those packets will be ignored anyway by the application Netfilter's manual says that it's safe to drop these packets.

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Ubuntu :: How To Add Auto CDMA Connection In Network Manager Of Ubuntu 10.04

Jun 12, 2010

I m using Ubuntu since 8.10 Then i switched to 9.04. When i tried 9.10 I was not able to connect with my Huawei EC325 modem which was available as an auto CDMA connection in the nepwork manager applet.I posted this in ubuntu forums. This could not get my Huawei USB dongle get connected. So I reverted back to 9.04 from 9.10. recently i tried Lucid. i was dissapointed with it. It seems Auto Cdma connection option under mobile broadband connection is been removed from 9.10. Jaunty updates will be available untill October 2010. So after that for a USB mobile user like me It will be difficult for me to get my 9.04 updated. Ubuntu 9.04 will be outdated. cannot you suggest some methods to solve the problem or shall i stick to jaunty jacklope.

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General :: Stop And Restart Ethernet Connection Ubuntu 9.10 - Ignoring Unknown Interface Eth0=eth0

Mar 8, 2010

If I uncheck and recheck "Enable Networking" in the Network Manager Applet 0.7.996 I would expect the wired network to disconnect (which it does) and reconnect (which it does NOT). So I tried sudo ifdown eth0 and got


Ignoring unknown interface eth0=eth0.

ifconfig tells me


eth0 Link encap:Ethernet HWaddr 00:25:64:e8:18:2c
inet addr: Bcast: Mask:
inet6 addr: fe80::225:64ff:fee8:182c/64 Scope:Link


so I am at a loss. How do I stop and restart the network interface short of rebooting the machine?

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Ubuntu Networking :: Setting Up Bluetooth Connection Between Two Computers Throws Connection Refused (111)

Apr 3, 2011

I'm trying to create a PAN (Personal Area Network) using a laptop (Siragon ML-1040) and my desktop computer, but I get the Connection Refused (111) error.

Blueman doesn't detect any network service between the two computers unless I start PAND on one of them and then it detects the NAP service. That, only after I enable the NAP/Workgroup services on the Services submenu in Blueman. However, it doesn't work neither with the NM plugins or without them (dhclient and that other one I can't remember the name of).

Any clues over here? I'm using pand 4.91 and blueman.

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Ubuntu Networking :: Wireless Network Connection Active But Still Not Internet Connection?

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: Bcast: Mask:
inet6 addr: fe80::206:25ff:fe12:833b/64 Scope:Link[code].....

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Ubuntu Networking :: SSH Connection - Router Works To Except Connection Requests

Jul 28, 2010

I'm trying to do a SSH connection between my home and work PC both machines are running ubuntu 10.04. I have read all the comunity documentation at [URL] from Work PC. I went on to the web site what is my ip address and noted down the number, From Home i opened a terminal and typed: pnig (ip address). to which their was no reply, now i'm assuming i need to configure the works router to except connection requests, is this Correct?

Also what information do i need from my works network and how do i get it? I understand that I need the routers expernal ip address, but how do i referiance a specified computer after that address? What program do i use in ubunu and how is that information applied to it?

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