General :: List Only The Device Names Of All Available Network Interfaces?

Oct 25, 2010

I want to get a list of all available Network-Device Names on my Linux server. I figured that

netstat -a

would do the job, however netstat produces quite much output:

eth0 Link encap:Ethernet Hardware Adresse 08:00:27:fc:5c:98
inet Adresse: Bcast: Maske:
inet6-Adresse: fe80::a00:27ff:fefc:5c98/64 Gültigkeitsbereich:Verbindung


I assume that this can be done by a combination of "cat", "sed" and "grep", but I have simply no clue of how to strip the uneccessary information.

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Fedora Networking :: Change Network Interfaces Names?

Dec 11, 2009

I found problem in FC 12 release. I installed fc 12 to server (earlier there was FC 7). Then as always i realised that names of interfaces (eth0, eth1, eth2 .... eth9) changed after install. eth0 became eth9, eth1 became eth5 ... Earlier on previous fedora releases i solved this problem correcting HWADDR in ifcfg-eth files, so i linked MAC addresses to names (eth0, eth1, eth2) as i wanted in a right order. Now I can't do this. After correcting these files and restarting network sevice i constantly get a message: device ... has different mac than expected. I looked ifup-eth file and compare it with the same one in fedora 7. And i found that in fedora 7 there is function rename_device which processes if HWADDR value doen't coincide with real mac address value. See code:

# remap, if the device is bound with a MAC address and not the right device num
# bail out, if the MAC does not fit
if [ -n "${HWADDR}" ]; then
if [ "${FOUNDMACADDR}" != "${HWADDR}" ]; then
curdev=`get_device_by_hwaddr ${HWADDR}`
if [ -n "$curdev" ]; then
rename_device "${REALDEVICE}" "${HWADDR}" "${curdev}" || {
echo $"Device ${DEVICE} has different MAC address than expected, ignoring."

But in fc 12 release there is no function rename_device!!!!!!!!! So in this case if HWADDR value is not the same as FOUNDMACADDR value (which equal to REALDEVICE mac address) i just get an error message So I can't change interfaces names, as result i can't organize right order of network interfaces as it was earlier on fc7.

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Programming :: List 4 Names From Users List And Output Them To Fbusers In Numbered Ascending Order?

Feb 2, 2010

How would I list 4 users ID numbered 10, 11, 12 and 13 from my users list and output them to a file busers where their names are numbered by ascending order? How would I accomplish that on a one line command?

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General :: Ubuntu - List Printer Names Acceptable For Use With Lpr?

Aug 18, 2010

The lpr man page says a destination printer can be specified with the -P flag -P destination[/instance] Prints files to the named printer I have 'added' various printers on local Samba shares using the GUI in Ubuntu/Gnome. How can I get a list of these available printers in the format that the -P flag expects (preferably from a bash shell)?

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Ubuntu Networking :: Adding Interfaces To /etc/network/interfaces?

Apr 16, 2010

If I try to add a new interface (eth1) to /etc/network/interfaces, I get

* Reconfiguring network interfaces... SIOCSIFADDR: No such device
eth1: ERROR while getting interface flags: No such device
SIOCSIFNETMASK: No such device


How do I add 2 interfaces and get anyone of them to work, as available ?

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General :: Filesystems - Changing Device Names In /dev

Apr 25, 2011

I have many disks and volumes in my system. Some of disks IDE, some SATA.

Volumes on SATA disks cause me problems - I have them listed in etc/fstab, but on every boot, they have different name:

/dev/sdd* becomes /dev/sdb*
/dev/sde* becomes /dev/sdc*

etc. on every boot.

1) Why is this happening?

2) How can I prevent it?

3) If I can't, is there a workaround?

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General :: Get Wvdial To Run From /etc/network/interfaces?

Dec 23, 2010

I am using wvdial to connect to a mobile network (I have a usb modem) and it works fine. However, I wanted to automate the connection a bit (currently I am running wvdial every time I want to connect). I was wandering if there is a way to add this network to /etc/network/interfaces (in a truly Debian way) to have it connect on startup and/or whenever I connect my modem.

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General :: Set Up Routing Over Two Network Interfaces

Sep 9, 2011

I'm often on my corporate network but also need to be on another network simultaneously. At the moment I have to manually switch back and forth between the two. I'm using ubuntu 10.04. I've come across an excellent document that explains how to do this: "Linux Advanced Routing & Traffic Control HOWTO" by Bart Hubert. He mentions:

make sure that your kernel is compiled with the "IP: advanced router" and "IP: policy routing" features

I've downloaded the kernel sources, but I don't find any config options with names like these in them.

sudo apt-get build-dep --no-install-recommends linux-image-$(uname -r)
sudo apt-get source linux-image-$(uname -r)

Searching doesn't reveal anything

~/kernelBuild/linux-2.6.35/debian.master$ grep -iR policy . | grep -i routing

So my question can I tell if the kernel I have has these config options. Failing that, how do I build a kernel that does support these things?

Additional use cases for this knowledge. (1) At work with desktop computer plugged into corporate network. Plug 3g phone into USB port. My corporate network wont allow me to access my external servers over ssh, but the 3g phone will. (2) At home on the corporate VPN, but would like to access my other local network computers.

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General :: How To Know Network Interfaces Under Ubuntu 11.04

Sep 9, 2011

When I run cat /etc/network/interfaces in Ubuntu 11.04 I get the below output.
auto lo
iface lo inet loopback
I don't see the eth0 or eth1 interfaces, but I am able to see them in the Network Tools application. How do I configure the eth0 and eth1 from command line?

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General :: Route Different Applications Through Different Network Interfaces?

Jan 13, 2011

Is it possible to route different applications through different network interfaces?

Let's say (hypothetically) I want to route /usr/bin/thunderbird through vlan0 but /usr/bin/firefox through eth0.

Is there a way? And if so, is there a graphical tool for it as well?

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General :: Bridging Network Interfaces Hangs On Getting IP

Aug 14, 2011

I have two physical NICs (eth2 & eth3) with eth2 connecting to the home router/dhcp server and eth3 connecting to another machine which needs access to the internet. I'm trying to create a bridge so that the second machine on eth3 can be connected on the lan. I've tried the following, however it hangs when attempting to get an IP address from the router. Likewise, attempting to give it a static route doesn't seem to work either.

$ sudo aptitude install bridge-utils
$ sudo ifconfig eth2 down
$ sudo ifconfig eth3 down
$ sudo brctl addbr br0
$ sudo brctl addif br0 eth2 eth3
$ sudo dhclient br0 # this hangs and fails to get a dhcp address

I've tried to ensure my routing table mimics what it looks like when using eth2 normally, I cannot hit the gateway at all.

$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface U 2 0 0 br0 UG 0 0 0 br0

I attempted an 'arping' to the MAC address of the router while I had eth2/3 bridged, but it failed to obtain it's IP address as well. One interesting thing I noticed was that attempting to bring down the bridge & reactivate my internet on eth2, I was having trouble pinging the gateway. It turned out 'ipmasq' had been installed and was running causing odd problems. When I stopped the ipmasq service, my internet started working properly again. I removed the 'ipmasq' package entirely and tried bridging the NICs again thinking it may have been causing problems, but it still failed.

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Programming :: Using C++ To List Wireless Interfaces?

Dec 23, 2009

I am trying to write a program to list wireless interfaces and changing mac address the interface that will run primarily on ubuntu 8.04 and hopefully other linux distros.I am able to list out the wireless interfaces and change MAC address using popen with linux commands in ubuntu 8.04Is there a way to use C++ to do the above instead of using popen with linux commands so that the program can be used for other linux distros?I have been googling on this but no luck so far.

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General :: /etc/network/interfaces Doesn't Get Loaded Automatically

Feb 17, 2011

In Ubuntu 9.10 I configured manually network settings to /etc/network/interfaces, and it works fine when I run /etc/init.d/networking restart.

Problem is that those settings are not loaded to GUI application (Preferences/Network connections).

I don't want to edit my preferences there, I just want to use my interfaces file as default! Do you know what's going on?

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General :: Cannot Open Network Interfaces - Permission Denied

Dec 11, 2010

I can't open etc/network/interfaces file comes some permission denied. What can I do?

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General :: Dual Domain Names On A Single Network?

Aug 10, 2010

Here is my scenario and what I want to try and achieve.

I have:


Server A = (
Server B = (

Currently I have domain name set up using a free dns service online. When I am anywhere in the world I just type the domain name it hits my static ISP IP via the free dns servers online, hits my home router, gets port forwarded to Server A and I am up and running.


I have bought a second domain for serverB and want it set up like serverA but I am totally baffled on how I can resolve 2 domain names on a single network? I need (somehow) to try and tell the dns servers that when I enter in it will hit my static ISP IP as above and then hit my home router but then get directed/split to Server B and not to Server A.

Basically all I want to do is name the machines and get traffic resolved to them.

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Networking :: Ethernet Interfaces - Device Activated On Reboot

Dec 28, 2010

The ethernet configuration files are under
"/etc/sysconfig/network-scripts" such as "ifcfg-eth0:1" etc.

The file looks as follow:

I've set the ONBOOT=no. This means this device should not be activated at boot-time. But as I reboot the machine, this device is activated again. This means the option ONBOOT doesn't work. Seems this is a bug of RedHat LINUX?

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Fedora Networking :: Setup The Network Scripts To Create Two Network Interfaces For Vlan X And Y?

Apr 7, 2009

Using Fedora 10, can anyone tell me how to setup the network scripts to create two network interfaces for vlan x and y. Both interfaces should obtain an ip from dhcp and both interfaces should run over eth0.

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OpenSUSE Network :: Network Manager Default Connection Can Handle Virtual Interfaces?

Jun 7, 2011

I've not found how to configure more than one ip address with network manager.Nor with kde nor with plasmoid network manager.I need several virtual ip addresses for eth0 when the "default" of eth0 is connected i.e. "Connected to Auto eth0" should initialize the virtual interfaces.I have not found no even how to configure the ip address.I think this will be used from ifup config in yast or not?There I have the virtual interfaces but they are not taken from network manager.And last but no least: Is it possible that when using network manager the eth0 is enabled even no user has logged in?

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Red Hat :: Networking - Setup Network Scripts To Create Two Network Interfaces For Vlan X And Y

Apr 7, 2009

Can anyone tell me how to setup the network scripts to create two network interfaces for vlan x and y. Both interfaces should obtain an ip from dhcp and both interfaces should run over eth0.

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Ubuntu :: Raid5 And Static Device Names?

May 17, 2011

I am setting up a Raid5 and torture testing it. I added two eSata ports to my machine. When a drive is installed in that eSata port and the machine then booted up the device name (e.g. /dev/sdc) is inserted in the middle of my Raid devices. And that is just one example of how the device names can change.I did a search on 'static device names' but I saw nothing directly related to Raid. What I did see were suggestions to create udev rules based on UUID. But that was for single disks, not Raid, where each drive/partition in the raid array appears to have the same UUID.I'm surprised this does not come up in the various Raid howtos because it is impossible to keep a Raid array intact without solving this problem unless the machine is never touched thereafter.

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Fedora Networking :: Open The Network Device Control To Activate It But There Is No Network Ports In Network Device Control?

Jan 7, 2010

I just added a 2 port network card to a system that is running Fedora 11, but it is INACTIVE. I open the Network Device Control to activate it but there is no network ports in Network Device Control. It is empty.It looks like the system recognize the card and loaded correct driver.

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Ubuntu :: 10.10 Mdadm RAID - Moving Device Names ?

Mar 25, 2011

I'm having trouble with Ubuntu 10.10 and stable device names. When I installed Ubuntu, the root drive was the only one in the machine; it obviously got /dev/sda.

After the base installation, I installed three additional 2TB drives to make RAID-5 array. Ubuntu renamed the root drive to /dev/sdd. While annoying I lived with it.

After creating a single partition set to "Linux raid autodetect" on each drive, I created the RAID-5 array:


All was going well until a reboot. When rebooting Ubuntu decided to make the root drive /dev/sda this time and now mdadm --detail /dev/md0 reports:


How to fix the array and make the device names stable?

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Hardware :: Block Device Names Change After Reboot

Jan 19, 2011

I built a Raid5 volume with 3 SATA II hard disk drives. Further I have a system disk conected through IDE. During the first setup the IDE disk becomes sda, the SATA II disk sd[bcd] respectively. Now, sometimes the device names change after reboot - why ever... E.g. one of the raid5 disk become sda and so I got an error message during the boot procedure regarding the raid set. Curious, when the system is up and I stop and restart the Raid5 volume it comes up and runs fine. Because I'm currently at work I can't post any more detailed config files at the moment.

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Networking :: Can Eth Device Names Be Correlated To Physical Port?

Dec 1, 2009

I am building a custom RedHat+<our-software> installer iso for our own appliance. I am using Red Hat 5.4. The appliances has two on-board eth interfaces. On the back panel of the appliance, these ports are marked 1 and 2. When I install RH, I find the device names assigned such as eth0/eth1 are arbitrary. I understand this is to be expected with kernels 2.6+. Most of our customers connect their eth cables to the port marked 1 on the back and assume they should configure eth0 to make the device reachable. However, sometimes port 1 gets assigned "eth1". This is not a blocking issue, but its going to confuse our customers and we wanted to make it easier on them.

From reading online discussion boards, I know HOW to switch the assignment of the eth names. However, what I am do not know is whether I need to switch them at all. So I have two questions
1) Is there anyway for me to tell which eth mac corresponds to which port on the back? Since they are soldered on the motherboard and not movable, I would think there would be some way to figure out that x mac address corresponds to the upper port (marked '1' etc).
2) Is there a way to tell this by running a linux command? We need to do this automatically so I need to be able to figure it out at install time from the kickstart post-install or similar.

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CentOS 5 :: Persistent Device Names For ISCSI Disks?

Nov 15, 2010

I have a server wich is connected to an iSCSI storage and gets harddisks from this storage. Sometimes I have to add new disks to this server. Everytime I add a disk and make an /etc/init.d/iscsi restart on the server the disks don't have the same device name as before the iscsi restart.

It should be possible to gave the disks persistent names using udev rules. Now I tried to create different rules in "/etc/udev/rules.d/99-static-iscsi-names.rules" e.g.

# /dev/sdc
KERNEL=="sd*", BUS=="scsi", PROGRAM=="/sbin/scsi_id -g -s %p",RESULT=="360a98000503355344c4a576864467877" NAME=="sdc%n"
In "/etc/rc.local" I added "/sbin/start_udev" and in "/etc/scsi_id.config" I added the line "vendor="NETAPP",model="LUN",options=-g"


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Ubuntu Installation :: Maverick Has Its Own Ideas About Drive Device Names?

Dec 15, 2010

I'm trying to install Xubuntu 10.10 onto a machine with 3 hard drives. My drives are (rather, should be) like this:

/dev/sdaX: Windows and Windows apps/games
/dev/sdbX: Data
/dev/sdcX: Blank drive for Linux.


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OpenSUSE Network :: Network - Browsing The Internet With Domain Names Does Not Work

Jun 25, 2010

In short: browsing the internet with domain names does not work. The long version: I've configured my network with DHCP and ifup. Ping works on my internal net and with servers in the internet. Dig work's too! I get the right IP to the requested domain. When i try to access the internet using firefox or even wget i get an DNS error. For example wget is showing the following error: Resolving failed: Name or service not known. wget: unable to resolve host address ''

Again dig show me the right IP and if i add the entry to /etc/hosts it work's too! I've even tried it with manually setup of ip address, nameserver and default gateway but with the same result. Switching off the firewall has no effect on this problem, too.

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OpenSUSE Network :: Cannot Resolve Host Names On Local Network?

Mar 9, 2010

I have a mac and an openSUSE box connected wirelessly to a router. From my mac, if I ping the Linux machine by both ip address and hostname "elmo.local", I get a response. If I ping my mac from the Linux machine using its ip address, I get a response. However, if I ping the mac from the Linux box using its name "kermit.local" - nothing!

This means in order to share files between them via the network, I have to use the ip address rather than name, but I'd rather not. When I had Ubuntu installed instead of openSUSE this all worked fine out of the box, so I'm assuming it's a problem with the setup of openSUSE rather than the router or the mac.

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Ubuntu :: Staticly Assign Device Names (/dev/sda, Etc.) To Specific Hard Drives?

Feb 20, 2011

This is one of those questions where I highly suspect that the answer will be something like ". . .just stinks bein' you, kid."My setup:I have Ubuntu 10.04 x64 (desktop) installed on a computer with a bunch of SATA ports, including one e-SATA on the backBecause of the way the hardware works with these ports, the *external* port is the first SATA port, a second SATA port inside becomes #2, and a cluster of four ports (that can be made into a (ahem!) RAID array become ports 3 through 6.

All ports are configured as SATA (PATA emulation)My boot drive is located on SATA-2 (the inside connector), a four disk "MD" raid array is located on SATA 3-6, and I have an external HD enclosure that I plug into the e-SATA connection.

With all six drives plugged in, they get ordered like this:
/dev/sda - External drive
/dev/sdb - Internal operating system drive (bootable)


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OpenSUSE Network :: Can't Get Interfaces To Come Up Without IPs

Apr 19, 2010

I'm trying to configure OpenSuSE 11.2 with Open vSwitch, and I'm having trouble getting various interfaces to come up automatically when I have bootmode set to "none." startmode is set to auto (or on - tried both), and bootmode set to none, with no IP address assigned in the file. At boot time, I get the message that it's bringing up eth0, for example, but when I log in and check, the interface is not up. Also, if I try "ifup eth0", I get the following output:

xen-users:~ # ifup eth0
eth0 device: Intel Corporation 82566DM-2 Gigabit Network Connection (rev 02)

but the interface is not brought up. why SuSE is saying that it's bringing up the interface successfully, but is actually not bringing it up?

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