Networking :: IP Keeps Changing Between Network Cards?
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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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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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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Jul 5, 2010
Ok, so I've gotten tired of my router, and I've decided to make my own using IPFire as the OS. Right now I'm looking for ethernet cards that I can use for the green network, but I don't know if I can use 2 for the same network. I'm trying to get 4 ports at 1000 Mbs, and the only thing I've been able to find so far that's within my price range is a card from startech that has 2 ports, but would I be able to use 2 for the green network?
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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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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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Mar 1, 2009
I have a fedora 10 box with two network card on eth0 I have a pppoe connection to the internet, on second card eth1 I share my internet connection end I set up a samba server but I don't know if the settings are good. How to do this settings right to work fine, the ip are assigned by dhcp I don't use any static ip .When I try to browse the internet from the other computers some site's like {.com ; .org ; .info} are block, other site from {.ro} are working. Someone tell me something about turn off all my filters, but I don't know where to find this filter to turn it off. And when I use samba I can't have and internet access or vice versa. My network look like that:
Code:
eth0
|<--pppoe connection
|
MyComputer
(fedora 10)
|
eth1
|
switch
|
comp.1 comp.2
Win OS MacOS
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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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Nov 21, 2010
I'm currently using windows 7 on my computer, I have an ATI GPU and I am willing to install Ubuntu to finally rock it out. However I'm going to change my video card for a newer nVidia one in a few weeks and I'm wondering about the drivers change.. Under windows it should be quite simple however I'm quite afraid of possible issues I could have under Ubuntu. Probably (I believe and hope) everything will just work fine, simply plug and play, no conflicts, nothing at all. However I'm asking because I would like to avoid any issues, as I prefer dealing with windows one month or so more than having driver issues under ubuntu...
Resume: is it possible that changing GPU (brand) generates driver issue under ubuntu 10.10?
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Jun 2, 2010
I have a strange problem regarding networking on the Alix 2d13 running Ubuntu 10.04. The Alix has 3 physical network interfaces, lspci says:
Code:
00:09.0 Ethernet controller [0200]: VIA Technologies, Inc. VT6105M [Rhine-III] [1106:3053] (rev 96)
Kernel driver in use: via-rhine
Kernel modules: via-rhine
00:0a.0 Ethernet controller [0200]: VIA Technologies, Inc. VT6105M [Rhine-III] [1106:3053] (rev 96)
Kernel driver in use: via-rhine
Kernel modules: via-rhine
[Code]...
It seems, if more than one cable is connected, a random hardware port is chosen as eth0-eth2. If only one cable is connected the port that is connected is chosen as eth0-eth2. Any idea what's going wrong here?
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Oct 19, 2010
I am on my University network. I am using Network Manager. The default setting is Automatic (DHCP) which, AIUI, means my IP and DNS is set automatically. If I change it to Automatic (DHCP) addresses only then I should be able to set my DNS. However, when I enter the OpenDNS server, although /etc/resolv.conf does change, I connect to my wireless network but have no ability to send / receive any data. Removing these settings and returning to Automatic (DHCP) enables me to send / receive traffic again.
However, I can use a VPN which does change the DNS settings. In Network Manager the setting is Automatic (VPN). My /etc/resolv.conf changes to:
domain my domain.ac.uk
search my.domain.ac.uk
nameserver vpn dns
nameserver vpn dns
nameserver university dns
And I can connect and send / receive as normal.
I can understand that my University has blocked the ability to change the DNS. What I do not understand is how I can change the DNS with a VPN but not manually?
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Feb 9, 2010
I have a desktop computer running OpenSUSE 11.2 with two network cards installed. I would like to use both cards for connecting to the internet using different networks. The setting would be the following: eth0 is the main (default) card, almost all programs should use this NIC for connecting to the internet. eth1 is used only by a few programs, which have setting for selecting which network interface to use. The two NIC's are connected to different networks, so the IP address of the NIC's, the related subnet masks and gateways are also different.
Saying short, I would like to have the two NIC's as they would be in two separate computers. I can set the IP address and subnet mask of the NIC's. The main problem is that I can only declare one gateway. How can i setup this? I do not use network manager, I configure network cards using yast, but if needed I can of course use ifconfig directly.
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Feb 25, 2011
I've installed Ubuntu Server 10.10 with two network cards. One for external, and one internal.My problem is that as soon as i activate eth1 (external), i can't access the server from the internal network (eth0)
With these settings i can't reach the internal network from inside.If i disable the gateway on eth1 and enable the gateway on eth0, it works.
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Aug 4, 2009
I need a script but i am not good at programming soWhat script have to do:- Every 1 minute is checking if ip address is available (ping)- if ip answers nothing happens- if ip does not answers: * file /etc/hosts is changed by one stored in /home/user/hosts* notification by xterm to restart some programIf finally ip answers file /etc/hosts is changed by one stored in /home/user2/hosts
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Jan 17, 2010
I have a newly installed CentOS 5.4 on Gigabyte G31M-ES2C, I had to change the motherboard since it has some problems. Unfortunately the new motherboard is a rev 2.x board, which has a different onboard NIC (old one is RTL 8102E, new one is AR8132), so now my ethernet connection doesn't work anymore (no eth0 device), I assume I need to install a new driver for the AR8132? If so, what's the steps to do so?lspci shows Ethernet controller as: Attansic Technology Corp. Atheros AR8132 / L1c Gigabit Ethernet Adapter (rev c0)
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Oct 24, 2010
I'm planning to use Debian as the OS for a firewall machine, which will sit between my internet connection and the rest of my computers. Now my network is all wired, no wireless whatsoever. I'm using the onboard the motherboards cat5 socket which seems to be using the VIA rhine driver and I'm also using a 3com 100MBps card.
I can list the machine spec if you want but it's nothing special, an old Athlon 64 rig with 1gb ram and an OEM motherboard, it all seems to work ok apart from the internet doesn't' seem to work. Lenny seems to detect both cards ok and I even used the net install CD and it managed to download everything using the 3com card.
The strange thing is when I'm in Lenny, I can't seem to connect. I can ping google, but when I try and view a webpage, the browser just sits there with a while screen... Could it be that using 2 network cards is confusing Debian? Right now I've only got the modem hooked up the the 3com card, and nothing connected to the onboard network card.
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Sep 4, 2010
I am using open suse 11.1 in my acer emachine laptop. Everything is okay except Network cards are not working. It says that firmware is missing or kernel problems. My network cards are Broadcom network cards. How can I fix it?
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Aug 10, 2010
I just installed Debian 5.0 onto my laptop (Dell e6410) and it appears to boot and run fine, except that it does not recognize the network card (it did not do so during the installation). It also does not seem to recognize the wireless card.I have an ethernet connection, but running ifconfig displays only the local connection.I have tried adding -nomodeset and -noacpi to the boot menu, but that does not seem to change things
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Feb 16, 2011
Toshiba T110 laptop, 4 meg ram, kernel 2.6.31-14; multi boot Suse / Ubuntu / Windows; Atheros AR8132 Ethernet card; Realtek RTL8191 SE wireless card.
Installed 9.10 from an old DVD lying around - everything appeared to go ok, but no networks cards - Ethernet or wireless - were detected during the install.
(Later versions do not install - problems somewhere with video card - I need to allow multi kernel selection - but this is another issue)
Does this mean that this install is toast, or can it be saved?
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Feb 9, 2010
I have two D-Link network cards installed in my computer. The Ubuntu 10.04a2 installer seemed to recognize only one of them, though I know both are functional. I plugged a CAT5 cable in here, connected to my home network (with Internet). The installer proceeded happily, configuring DHCP and synchronizing clocks. However, when I rebooted after its completion, Ubuntu didn't recognize that I was connected to the network. I re-jiggled the RJ-45 connector, to no avail. When I run "System Testing," it does list both network cards during the Network suite, one being D-Link, and the other "James Bond" or something. So, what gives?
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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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Jan 18, 2011
how to make my second network card work?Here is the info (debian lenny) I am at right now:
ifconfig -a:
-----------------
eth1 Link encap:Ethernet HWaddr 00:50:ba:42:5c:a2
[code]....
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Aug 16, 2010
I use a network-connected HP printer through hplip and cupsI'm trying to discover how to access the media card ports that are built-in on the printer. Q1: Is there some way that my linux workstations can mount or otherwise access these flash-media cards?If not, then,Q2: Does anyone know about a network-connected, shared resource, multiple format media card device?(My wireless router has a USB port for shared things, but I think
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May 3, 2010
I've been searching all over trying to figure out how to get my Slackware box to detect my 2 PCMCIA wired nics. Specs are:
Dell Latitude CPi (old, I know...)
Compaq 10/100 PC Card (series NNB108)
Xircom "Credit Card" Ethernet 10/100+ and Modem 56 (model: CEM56-100.
Slackware 11 (kernel 2.6.21.5)
Both cards work under Ubuntu 9.04 on the same hardware so I know they are both working and linux compatible.
Checking the /var/log/messages file I see entries when I insert or remove the card. States that a PCMCIA card has been added/removed however other than the /messages log entry there is no other activity that I notice. No lights on the NIC card dongles either. Most of the reading I've done on the net indicate that there should be a /etc/pcmcia/network.opts file but I don't even have the /etc/pcmcia directory. Sure would appreciate some guidance on where to go or what to do to get these two PCMCIA nics up and running.
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Feb 10, 2010
I have a Proliant 7000 with 4 interfaces across 2 cards - 3 intel 10/100Tx and 1 intel 100FX. During install it detected the 3 tx interfaces - but couldnt see the network - post install the network devices were no longer there, their devices missing from /dev/.
Neither google nor a forum search have been particularly edifying, is this a known issue with any cards? If so is there a known fix? ifconfig gives me information for loopback only as expected.
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Mar 31, 2010
Does anyone have a kernel that supports Atheros network cards? I am using ASUS EEE PC netbooks and none of the kernels I have access to have drivers installed for the NICs. I am having issues when I try to build my own kernel and maybe someone has a precompiled one? Either that or if someone has a basic, step-by-step guide to building your own custom kernel. This is my first time building a kernel and I am kind of lost. This isn't actually for running Ubuntu I will be using it in an imaging program called FOG. I just need a kernel that will support these NICs so I am able to do some imaging.
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Nov 22, 2010
I'm wondering a couple of things about my LAMP stacks:
1) How do I get a list of all the network cards installed in a linux box? I've run this command and it shows 2 network cards which is probably all of them:
Code:
mii-tool -v
2) How can I check the percent utilization of a given network card? I.e., at any given time, what linux command will tell me the how much of a network card's bandwidth is being consumed? I've checked both ethtool and mii-tool and I don't really see any helpful stats.
3) How can I make sure that a linux box will optimally use both network cards? I'm a bit fuzzy on how IP addresses and network cards and hostnames work together.
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Mar 25, 2011
I want to share the wireless connection from an Ubuntu machine with an old lap top via the wired Ethernet cards. the old laptop doesn't have wire less. the Ubuntu machine is 10.04 LTS -the Lucid Lynx.
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