Ubuntu Networking :: Need To Switch Default NIC
May 10, 2010
I have 2 NIC's in my mythbuntu 10.0.4 box, one is connected to a closed network eth0 and the other to an Internet gateway eth1.
For some reason Ubuntu always makes eth0 the default network card, even if I delete the connections and add them in different a order. Because of this I can't access the Internet w/o disabling the private network card.
I could just switch the cables over but this should be doable in software and I'd like to know how.
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Jul 19, 2010
I have been using ubuntu for almost a week. and i am impressed on how it seems to fulfills most of my computer needs better than windows. when i click the new message indicator (the envelope), and click chat, by default it opens empathy. personally i prefer pidgin, and i would like to make it open pidgin instead of empathy when i press chat. it currently shows pidgin in the list anyway but i want it to appear as chat.
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Jan 8, 2011
I'm running through an Emacs tutorial and I was trying to figure out how to exchange CTRL and CAPSLOCK.
1. From the Emacs Wiki, i saw
Code:
As super-user:
$ loadkeys emacs
$ echo "loadkeys emacs" >> /etc/rc.d/rc.local
so, maybe stupidly I tried this. Which seems to have changed nothing.
so then I try
Code:
loadkeys -d
to try and get back to the default. Which doesn't seem to work. so then thinking i should reset everything, try to go in /usr/share/kbd/keymaps/i386/qwerty and do
Code:
loadkeys defkeymap.map.gz
Finally, I go into /etc/X11 and edit xorg.conf-vesa to uncomment
Code:
# If you'd like to switch the positions of your capslock and
# control keys, use:
#
Option "XkbOptions" "ctrl:swapcaps"
and restart.
To no avail...
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Jul 22, 2009
I have problems with keyboard layout switcher. On Gnome everything works. But when I start to use other DE I can't switch keyboard layout by default. So I create xorg.conf, but anyway it doesn't work...
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Dec 12, 2008
I have isntalled a server with Centos 5.2 OS, now I would like to switch from the default sendmail to postfix doing a yum install postfix I've noticed there is already available an rpm version for the OS but I would like to compile my own 2.5 version, I've noticed compiling from source does not allow me to use the mail switcher to tell to the system I'm gonna use Postfix instead of Sendmail as the default MTA while this is possible when I use the "official" rpm version of the package. Now my question is this, would this be a problem? There is some specific procedure/best practice I should follow? Or once compiled and configured Postfix I can safely disable/uninstall sendmail?
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Oct 7, 2010
I successfully installed Ubuntu 10.04 on 2 laptops (both are identical in terms of hardware). In addition, I connected both of them (using RJ45 cables) to a switch (just a switch; I don't have a router). Can anybody guide me what should I do / what settings should I specify in each laptop in order to be able to SSH from one laptop to another?
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Jul 28, 2009
Can the fibre channel switch in the centOS5.3 cluster edition be switched for a regular router or hub?
If so how would one do this? If not why does the switch have to be fibre channel?
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Nov 5, 2010
I have an HP ProCurve 2424M 24 port switch and I can't access it through the browser because I can't find the IP address of the switchhave tried resetting back to factory configuration, but still can't find the IP. So I have a null-modem cable (serial) and am trying to get into the switch via the terminal. The only thing is that I don't know what commands to type? Do I need to configure the port? If so, how do I do that? I'm not necessarily a newbie to Linux, but when it comes to the terminal
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Nov 9, 2010
how to make wifi work. I'm looking for a way to turn it off to save battery life. Aspire One D255, Fn F3 toggles wifi off and on, with an indicator light and, in Win 7, an on-screen indicator. Fn F3 doesn't work in Ubuntu, and there are times I'd like to turn the wifi off. Is there a command to do this?
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Dec 23, 2010
I got a Ubuntu machine running a local web server. It is connected to an archaic 10mbit hub, and I'd like a little bit faster network. I got a new 100/1000mbit switch connected to my router. I have 3 other PC's running off it, no problems at all. No configuration was necessary, and all existing cables worked fine.
Since the router and hub are located at the opposite end of the house, and the switch is in my PC room, I made up a new cable to connect it to my Ubuntu machine. It's just a straight-through cable, just like the other cables connecting the switch to other PC's. Okay so, when I plug the cable in to the machine I get no ethernet lights on either the machine nor the switch. But here's the kicker: I plug the cable into my laptop (running Windows 7), and it works perfectly. I restart the machine with the cable in, and get a green light. As soon as Ubuntu loads up, no lights, no connectivity. It shouldn't matter, but I'm running a static IP on the machine. I also have static IP's on the other PC's connected to the switch and nothing had to be changed.
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Jan 2, 2011
I just installed 10.10 on my HP dv2700 laptop and I can't get the wireless card to turn on. Here are some of my results. I get the same results regardless of which position the wireless switch is in and the indicator light always indicates that the wireless is off.
paul@paul-HLaptop:~$ iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
wlan0 IEEE 802.11abg ESSIDff/any
[Code].....
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Apr 2, 2011
I searched for this, and all I saw was advice on how to make wifi work. Mine works just fine, I'm looking for a way to turn it off to save battery life. Here's what I mean. Aspire One D255, Fn F3 toggles wifi off and on, with an indicator light and, in Win 7, an on-screen indicator. Fn F3 doesn't work in Ubuntu, and there are times I'd like to turn the wifi off. Is there a command to do this? Or maybe something in the menus that I'm missing?
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Apr 6, 2011
I am wanting to build myself a Linux based firewall and network switch but I am not entirely sure where to start. I would like to point out that I am aware that it would be easier and quicker to just buy a switch and use that, but this is an intellectual exercise.
What I want to do is have a NIC which has the internet coming in. The traffic is then passed through the firewall program (I think IP tables is what I should be using?).
Now my main issue is that I will have quite a few Network Interfaces to manage. The machine could easily assign IPs by DHCP and act as the DNS server but what would I need to use to share the internet connection to all the NICs? There will be at least 4 interfaces, but possibly up to 12.
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May 11, 2011
I am new with Linux and I am trying to figure out how to get my wireless working. My wireless LED does not switch on and it also does not work. In some threads I have seen people post some outputs of command from the terminal. I do not know how to copy this because I can not use ctrl + c in the terminal.
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May 26, 2011
I just installed Ubuntu 11.04, from Windows XP.
Ever since I have tried it, I can only connect to the internet on a wired connection, but no wireless.
It says "Wireless Connection disabled by hardware switch"
I'm not 100% sure what that means, has anyone else had this predicament?
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Oct 6, 2010
Server is on Port 1, with an address of 10.3.2.1.
Someone plugs into Port 2 and gives themself the same address.
That would cause problems, right?
So, is there a way, to say to the switch, "Hey, 10.3.2.1 is on Port 1, and nowhere else. Do not let anyone use the IP 10.3.2.1 on any other port, and if they do, disallow the traffic."
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Jan 13, 2010
I recently upgraded a server's networking card to a Gigabit NIC, and got a hold of a Gigabit switch (Here's a link) in the hopes of increasing my network performance - however, I'm getting around 10 MB/s throughput now, which is exactly what I used to get with the old 10/100 switch & NIC. The new switch recognizes both computers as Gigabit (the other machine has always had a Gigabit NIC), and both computers say they're gigabit - I've found various sites around the interwebz recommending tweaking some TCP/IP buffer settings, which I have tried to no avail. I also saw that hard drive speed is usually the limiting factor. According to "hdmarp -t", the server HDD (definitely the slower of the two) is:
Code:
Timing buffered disk reads: 226 MB in 3.00 seconds = 75.26 MB/sec
So that's obviously not my issue. The cabling is CAT6 - I ran it myself, but if I'd mis-wired the end connections, wouldn't it just not work at all? I admit, I bought cheap NIC's (I'm not going for like 124.9 MB/s throughput here..), and I didn't expect them to be stellar, but I certainly expected the speeds to improve. I'm moving files from a server running Ubuntu 9.04 to a Windows machine - I've tried both my Samba shares on the server and an SFTP transfer: they both have about the same throughput.
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May 19, 2010
I have my internet connection via a wireless USB adapter and that works fine. Recently I connected my pc (Ubuntu 9.10) through a wired switch to my modified xbox so I can watch my videos in my office. I can share my content with my xbox (except for the items on my external USB HD's - I am working on that and will post that question elsewhere) but when I have my PC's wired connection plugged into the switch I can not surf the web or check email. It gets stuck at resolving host and then times out. If I disconnect the pc from the switch it sometimes connects before it times out. Usually it is quicker if I reboot without the wired intranet connection.
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Jul 29, 2010
My PC is connected to an modem (DHCP) with IP 192.168.1.21 on eth0 Internet works perfectly I have installed an additional LAN card and configured it as eth1 with IP of 192.168.0.1 When I connect this LAN card to a LAN switch which in turn is connected to 6 other PCs, the internet stops working. As soon as I switch OFF the LAN switch, I am able to access internet. The IP addresses of the other PCs are configured as 192.168.0.2 etc. with gateway as 192.168.0.1 and DNS same as the DNS on the external interface. I can ping 192.168.0.1 from the LAN but neither LAN nor the main PC can access net. I was planning to Masquerade and NAT the other computers without using squid
My setup is as follows
ISP - Modem(192.168.1.1) - Ubuntu desktop 9.04(external interface eth0 192.168.1.21 & internal interface eth1 192.168.0.1) - switch - LAN (comprising of Ubtuntu 9.04, 9.10, 10.4 & XP machines with IP 192.168.0.2 - 8 and gateway of 192.168.0.1) I did NAT as per [URL]
This worked perfectly well 1 day Next day onwards whenever the LAN switch is "ON" the main Ubuntu wudnt get internet and the internet connection would work only when the LAN switch is turned "OFF". Even if all the PCs in LAN were to be switched off, the main Ubuntu would behave similarly i.e. internet would work only when switch isn't connected to it or switched off.
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Aug 21, 2010
I currently have a command line Ubuntu 9.10 installation.
I wish to be able to have either both wireless and wired connection working
For example: when LAN is connection the wireless is switched off, when LAN is disconnected the wireless comes up (WPA2)
I know that the Network Manager in Gnome does this auto switching for you but I need to know how to do this in command line only.
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Oct 7, 2010
How to do this?
Is it possible to manipulate the selection of network proxy through shell script?
to
What happens How to change the selection of "Default" to "Something" through shell script? What I am trying to say is, I have created a new location called "Something" with HTTP Proxy as proxy and port as 8080. If I am at my home, I use "Default". If I goto my college, I should change it to "something". How to do this via shell script?
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Oct 13, 2010
I am using 2 wireless network adaptors,one intel 5300 AGN (driver iwlagn)and the other one smc ezconnect ( driver zd1211rw), a usb adaptor The intel 5300 AGN has a hardware switch.
However, everytime i turn off the hardware switch of intel 5300 AGN, the smc ezconnect adaptor is turned off too. How to I prevent this(how to make 2 switch for 2 adaptors?)
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May 21, 2011
i hate to start a new thread that is already discussed in many places. But after hours and hours of digging, i am thinking there might be a 5 minute solution. But only if i know that. I own a lenovo ideapad y450. my networking controllers are...
Quote:
Intel Corporation PRO/Wireless 5100 AGN [Shiloh] Network Connection
Broadcom Corporation NetLink BCM5784M Gigabit Ethernet PCIe (rev 10)
The problem is i cannot access wifi. The network manager says the wireless is disabled by hardware switch.
My hardware switch for wireless (on the laptop) is infact ON.
[Code]...
During natty installation (it was a fresh one) i had ticked for third party installations but had no internet running at that time. now the additional drivers under hardware in system settings shows nothing. just blank. NO MATTER WHAT I DID I HAVE COME TO THE FIRST STEP AGAIN. MY WIRELESS IS DISABLED BY HARDWARE SWITCH. where is this switch & how do i switch it on (if thatz so easy.) but all the solutions given in other thread were specific to some system or condition and mine somehow did not match.
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Jun 10, 2011
Just installed ubuntu 11.04. It told me a driver was missing and installed the Broadcom STA driver. I believe it went on line after that, but I restarted and its not going back online.
Also according to 'rfkill list all' my wifi seems to be hard blocked.
EDIT: also iwconfig outputs this:
Code:
lo no wireless extensions.
eth0 no wireless extensions.
wlan0 IEEE 802.11bg ESSID:off/any
[Code]....
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Jun 30, 2010
I have a hub with some VoIP phones attached as well as a machine that is used to record the calls. This all works fine as all packets coming to/from the voip phones are also seen by the recorder so it can process them as necessary.
What i want to do is put another machine between the hub and recorder and have it act as a transparent firewall. So far i've managed to successfully set up a bridge on ports eth1 and eth2 and all the packets destined for the recorder go through the bridge fine. The problem is that the bridge is acting as a switch so the packets from the phones are received on eth2 but don't get retransmitted on eth1. Is there any way to configure the bridge so that all packets received on eth2 are transmitted on eth1, i.e. have it act as a hub instead?
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Jan 15, 2011
I am new to linux and also new to this forum. I love how light Slax is but it won't let me connect to my wifi. It scans and finds my router but the option to switch to the network is grayed out. How can I fix this problem?
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Feb 15, 2011
got a watchguard firebox 1000 here, old tech i know, the manuals/pdfs on their site want me to use a crossover cable for the quick setup and I havent got any at the moment, but I got dozens of normal patch cables and switches. Can I use 2 patch cables on a switch to simulate a crossover cable scenario? If so ... would there be anything extra to do to make that method work? --tia
this thread indicates there is no difference other than what they mention in the thread? confirmation on that? [URL]
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May 10, 2010
I have seen there are some tricks to handle transparents switches using Nagios. Does anybody know if it is possible to handle unmanaged switches connected in daisy chain?In my network I have some devices connected in this way [switch]--[dev_1]--[dev_2]--[dev_3]
where "switch" is a managed switch" and dev_i is a device with an unmanaged switch inside (no snmp available). All the devices have an IP address. Is it possible to get the network topology with Nagios?
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Nov 29, 2010
I have a Pc that has 2 Ethernet and I have also 2 switch. I want the PC to become the router and be connected to 2 switch.How can I setup this one on FEDORA and I want to assigned for eth0 192.168.26.51 and eth1 192.168.22.51 for the IP.
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May 4, 2011
I installed Slackware 13.37 console only.
I have two ethernet cards.
I want to change eth1 to eth0 and eth0 to eth1, because I have some old firewall script and I need eth0 be eth1, because of routing internet. My ISP close my net connection on MAC adress.
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