Ubuntu Networking :: Using 4 NIC Cards?
Jul 13, 2011
I am setting up a class using a vmWare ESX server. Because of security proceedures, the students are not allowed to connect directly to the internet. Because of file space, the are severated on 3 servers. I am trying to set up a server that connects to the internet and all 3 subnets that the students are on.
I have configure 4 virtual NICs 1 with DHCP connected to the internet. The other 3 goes to each student network. I can get 2 working at a time. 1 using the DHCP and 1 of the other networks. It seems to be order dependent. On the main server I can ping the local address. When I ping the students systems, I can reach 1 but not the other 2. I get a host unreachable message.
Is there a limitation to 2 NICS. If not, is there any magic incantation to run the 4 nics?
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Dec 1, 2010
I have a dns server started with 2 NIC Cards in it. The bios sees both cards but they both dont show in ifconfig. is there a way to activate the second card?
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Apr 12, 2010
So I am looking to modify my network cards MTU (for some testing purposes), and I only know how to do it it Windows (via command prompt ping command with special flags) and not in Ubuntu.
Any easy way to figure out proper MTU numbers in Ubuntu?
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Jul 6, 2010
I have two nic cards installed in a Lucid LTS server.
eth0 is static using
address 192.168.0.235
gateway 192.168.0.1
netmask 255.255.255.0
[Code]...
I have my Qwest DSL modem port forwarding port 80 to 192.168.3.235 however this doesn't seem to work if I have both cards running. If I remove the second card (eth1) and reconfigure eth0 to use 192.168.3.235 I can port forward into my webserver.
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Aug 11, 2010
I'm running 10.04 64 bit, and the Intel PRO/Wireless 5100 AGN does not work with n routers. I'd like to either upgrade the card, or buy a usb adapter, but I can't figure out which cards will work. I've searched[URL].. which lists supported wifi cards, but most of the info on that page is not relevant to lucid, and hasn't been updated at all this year. I saw elsewhere that any card with the atheros chipset will work, but what cards have this? Will all of them with this chipset work?
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Jan 29, 2011
Got 4 onbards nics and would like to bond them into a single 4GB pipe. It is running a number of VM's. I can set up a link in my switch but I am stumped on ubuntu side. I think I have to make a file with entries but not sure where or how.
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Jun 9, 2011
I'm looking for a cheap and stable wifi card that will work with Ubuntu 11.04. My Linksys WMP300N is creating a conflict with the native Broadcom driver (causing the system to freeze after light network traffic) and ndiswrappper isn't working for 64 bit Ubuntu.
Does anyone own a relatively cheap (less than $40USD) PCI card that works flawlessly, or close to flawlessly with 64bit Ubuntu 11.04? I need to get off of this 35ft ethernet cord. Cat5 + crossing top of stairs = problem in the future.
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Feb 8, 2010
Does anyone know what chipset is used in the HQRP 802.11n PCI mini cards (not express)?
[URL]
I'm looking for a 2 antenna card that does 11N for an older Dell laptop that use mini pci. This is the only one I found, but the chipset is a mystery, and I need to know it before buying it.
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May 2, 2010
Had a hard drive fail this week, and I am going to order a new one. I am using $150 dollars in Best Buy gift certificates. Well seeing as how I have some left over I would like to get a usb wireless adapter that would work out of the box (preferably usb although I could always get an internal). All Best Buy has are wireless N cards and I was wondering if anyone knows if any Wireless N USB cards work out of the box without downloading firmware or NDISwrapper.
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Jun 13, 2010
I recently purchased two MSI Windtop AE2220's. One for my home which uses a router with WPA2 protection and one for my office where I use WEP encryption.
The Realtek internal wireless card will not connect to a WEP router if you are running Ubuntu Lucid Lynx 10.04. I have exhausted all suggestions on this site and all drivers found at Realtek's site.
I have been using Ubuntu since Hardy Heron, but sadly, painfully, I have had to install Windows 7 on my office machine until I find a wireless card compatible with the MSI Windtop AE2220, Lucid and WEP.
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Apr 8, 2011
Do you know what's relationship between ethx and physical net cards? such as i have three net cards in the PC, named A, B, C. In which config file i could know that eth0 -> A, eth1 -> B, and eth2 -> C. Would the mapping relationship change after reboot? Is there any method i could change the mapping?
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Jul 29, 2011
I have a wlan0 which is Atheros AR928X and wlan1 which is Alfa AWUS036H
I thought I could set iwconfig wlan0 txpower [higher than 20] but any value more than 20 results in:
Error for wireless request "Set Tx Power" (8B26) :
SET failed on device wlan0 ; Invalid argument.
I get the same error for wlan1 when trying a value higher than 27.
Is there a way of increasing the TX power and if not then why not?
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Jul 8, 2010
I have a small pc running fedora 8 with iptables and 2 network cards for routing/firewall and secondary DNS.For some time I've been alerted by the network guys that this machine was generating some alerts. The real network IP address keeps being assigned to the other interface, intended for LAN only (10.0.0.1/24).I've already changed the PC, installed a more recent operating system, replaced the 2 network cards and the problem persists. I have another pc running the same services (except DNS) in a very simillar way and no alert logs from that one.onder if it is some configuration issue on my startup firewall script.I've also installed arpwatch and I could confirm this IP and physical address issue:
Arpwatch output:
hostname: my.host.name
ip address: my.ip.address
[code]....
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Sep 15, 2010
I am writing a new lightweight Linux distibution mainly for educational purposes. I have a problem; it won't find any ethernet cards. I have tried enabling several things in the kernel config. What I would really like to know is how to enable some generic ethernet drivers and therefore networking. I would like to avoid having to use modules. I'm using kernel version 2.6.35.1.
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Jun 7, 2011
we are using Red hat enterprise 5.4 for our internet connection with following ip's
eth0: 192.168.1.2 (local lan)
eth1: 114.143.28.240 (static ip address for 1st isp)
eth2: 192.168.100.149 (2nd isp modem connected with lan cable)
first isp i.e tata internet connected to the internet and working very well
now i want 2nd isp to work when the first isp goes down, i had configured all dns in the resolve.conf and squid.conf, when i switch off the 1st isp for checking that failover is working or not i cannot get internet packets from the second isp.
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Apr 2, 2009
I want to provide dhcp in different NIC which are eth3 and eth2. eth2 has the IP address of 192.168.3.1 and eth3 has the IP address of 192.168.4.1. I want to provide dhcp to 192.168.3.0network and also for 192.168.4.0 network.All these are done in ubuntu server.
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Jul 12, 2010
I have two NIC card that connect to different networks. code...
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Jun 11, 2011
I installed slackware 13 successfully. The problem I found is: I have 2 lancard, one is built in, other is external. When I net config it brings up 1 lan card not other. When I again netconfig it brings other lancard and now not the 1st one this time. thats means it bringing up any of the 1 lancard at a time. how both lancard can be bring up.
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Apr 29, 2010
I'm running Ubuntu 9.0.4 with an Intel PRO/100 VE Network Connection. I have been trying for a couple weeks now different techniques to get my wired ethernet connection working properly. I have a seeming common issue with my e100 driver dropping connection and having hard time picking it back up sometimes. I want to purchase a relatively inexpensive Ethernet card whose generic Linux driver actually operates it CORRECTLY, open up comp and put it in, and update to 9.10. Any list of Ethernet cards that are know to work flawlessly on Ubuntu, or at least tell me which card YOU are using that works perfect without having to write code, install wrapper programs, etc...?
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May 25, 2010
I'm running ubuntu lucid and i was thinking in purchasing one or more extra wifi cards to try to configure my computer to manage different conections at the same time, with different isp's. The thing is that I'm not quite sure if what i want to do is actually possible.
The easiest way that crossed my mind was to try to configure a / multiple virtual machines that are redirected threw proxies to ubuntu and try to configure that each proxie port goes threw a different internet gateaway. This way i might be able to divide threw different sessions of JDownloader, installed on each virtual machine, the things i want to download. The negative aspect of this idea is having multiple jdownloader sessions will make my laptop work to almost 100% for sure...
Another thought i have was to make JDownloader manage its downloads in only one session redirecting them to my internet conections; the negative thing is that i think i will have to try to modify its source and learn java...
And well my last possible configuration i had in mind was to try to make ubuntu directly add up all my internet conections manage as if it was one. the negative thing here is that i might not be able to get multiple downloads from some sites
Well, all this where just thoughts, im struggling whether to buy another card or not to try to setup any of this configurations but im not really sure if any of them are actually possible. Is there an easy way to manage this?
I just want to take the most out of my internet conections... if i'm at college i have to options that are quite slow, adding them up with two cards would be great, i might also be able to add a third and a fourth conection. Also if i'm on a coffe and i need some bandwith i could try to make it go with an open network arround, etc.
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Nov 2, 2010
I've got two NICs connected to two different routers, and on different subnets of course. Each is set for static IP. But somehow I must have mixed up the connections at some point, so the NICs don't always have the IP addresses I expect. I think there may also be a mixup with different ways of setting the network addresses. When I click the Network Icon on the Desktop, I see that each NIC has both addresses as options. The /etc/network/interfaces file has some information about eth0, but all commented out, so there must be another place the addresses get set. And I just discovered that eth0 and eth1 aren't physical but virtual. I guess eth0 is the first one that is set.
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Nov 30, 2010
I'm new to Ubuntu - I've decided to give Ubuntu Studio a go as an alternative to Windows. However, after installing it, neither of my network cards work. I have a Intel Pro Wireless 3945ABG wireless card, and a Broadcom Netlink Gigabit Wired card. Neither work, And I'm not sure how to. I've tried searching, and have come up with the .tgz file here, but I have no idea what to do with it I'm concentrating on the wireless card for the moment, seeing as that will be the main one I use.
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Dec 6, 2010
This doc is very outdated. I don't know who compiled it, but it's very old and isn't up to pace with all the newer hardware that has been released over the past year.
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Jan 14, 2011
I'm running xubuntu 10.04 LTS (upgraded from 8.04 LTS) on an old low power sempron machine as an always on 'internet machine' i.e. it does all my downloading email etc. and up until yesterday it has always performed flawlessly. Yesterday wasn't its fault, it was a BTI network problem that took out my internet service but while talking to tech support I realized that this machine has lost all ways to control the network cards. Network-manager and network-manager-gnome are installed according to synaptic but they have no menu or notification appearance. I've tried reinstalling them to no avail.
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Jul 16, 2011
Disable Dvd/cd rom , usb ports and wireless cards permanently in acer laptop. I no longer need those..
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May 22, 2009
I'm developing an application to monitorize the network interfaces plugged in my PC. I know that wireless interfaces are listed in /proc/net/dev, but I don't know how to identify a cellular NIC.Is there any virtual file in /proc that shows the cellular NICs in the system? Could I identify different cellular NICs looking at /dev/tty?
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Apr 7, 2010
I have installed CentOs 5.4 for Snort sensor , on the location where i intend to place the Snort sensor to listen for internal firewall leg (LAN) the switch doesn't support port mirror so i would like to create with 2 nic's bridge and pass trough the firewall internal leg my question how do i set such configuration.
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Mar 29, 2011
I have installed slackware 13.1 64-bit version and can not recognize network cards.I'm with laptop acer aspire 7540g.Wireless card is atheros ar5b93.Ethernet card is Broadcom NetLink � Gigabit Ethernet.
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Feb 8, 2010
I've got an old laptop wich wireless adapter is a Gigabyte GN-WI01 GS MINI PCI(its chipset is Realtek RTL8169/8110, I believe) and I'm not able to make it run in Wifislax 3.1 Live CD. I downloaded the linux drivers for it and tried to install them following the instructions but when it came the time to execute configure.sh it told me that I had to actualize some kind of packets first(GK+ or something like that can't remember ). I also have another wireless usb adapter that I tried to use too. It's a Linksys WUSB54g v4(chipset: rt2570). I tried to follow a guide I found about making run an adapter like that on Wifislax 3.1 but when I had to "Force ralink rt73 on rt2500" it doesn't appear on my Live CD version, it appears "Force ralink rt73 on rt2570", dunno if it has something to be but I get an error while making it.
I don't know if it has to be with my laptop, my wireless adapters or my way of following the steps. If it has to be with my adapters I would like to buy some new one(not very expensive) that I won't have any problems running it on Wifislax and that will work on my old laptop(cause I just have that one and can't afford a new one).
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Sep 26, 2010
I've got two network card interfaces on my computer, one wireless and one wired. The wireless card is connected to the Internet and the wired is connected to the LAN. When only the wireless card is active, Internet works. As soon as i enable the second wired card, Internet stops working. And it seems like Ubuntu chooses the wired card for Internet as soon as it's enabled.
Are there any ways to solve this? So my Ubuntu box always chooses the wireless card for Internet traffic and let me use the wired device for LAN only?
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