Networking :: Configuring 2 NIC's On Ubuntu Desktop 10.04
Apr 20, 2011
I have 2 pc's at home, neither v flashy but both more than capable of running this. Previously I had them both running XP SP2. One pc has 2 NICs in it and the second only one. So, PC1 (now running Ubuntu desktop 10.04) has the 2 NICs installed ...
1) A realtek NIC which is on 'eth1' and from which I receive internet connectivity from the router of this shared house. (2 other people connect their PCs to the internet via this router.)
2) A 3com NIC on 'eth0' which I have connected (using a crossover cable) to the Intel 'PRO100 VM' NIC on PC2.
Admittedly this took me some time to get half working. Currently I can connect to the internet through 'eth1' OR to PC2 via 'eth0' BUT NOT AT THE SAME TIME. However, If I disconnect one (by left clicking on 'disconnect' under the top of screen menu bar, then the other one will immediately work ... and visa versa.
I had this working when both PC's were running windows XP but now in trying to educate myself further I have installed Ubuntu on PC1 and am attempting the same thing. I refuse to accept that as alot of these thread responses state, that it 'can't be done'. Quite clearly it can be done since the physical connections and hardware are no different, its just about ensuring that the protocols are all correct and that I haven't done something stupid.
I am very keen to learn more about computer networks and equally keen to educate myself in the ways of Linux, in fact I am studying to gain a network qualification as we speak but at this stage its still a little confusing. I have learned an awful lot about the fundamentals of networking but the 'hands on stuff' is where I really need to test myself.
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May 17, 2011
Yesterday i've installed Fedora 14 x64 on my desktop PC. Everything is working just fine, but then i came to the problem of sharing internet connection for other computers (strictly speaking, two laptop ones) that i use at home.
I know, there were many articles that cover that problem, but nevertheless i was unable to make the things work.
So, going to the point (i would point it out for clarify):
1) My desktop computer has two Ethernet interfaces (eth0 and eth1) and single WiFi one (wlan0), that is not used at the moment.
2) Desktop's eth0 is connected directly to the internet via cable; interface is configured to work in DHCP mode and it is working properly.
3) Desktop's eth1 is connected to the router (WRT54GL, as far as i can remember model) and it was used (under Windows XP) to provide shared internet connection; it is configured to have static IP of 192.168.0.1 with mask of 255.255.255.0 (default settings for XP I-net Connection Sharing) and i've configured it in such way in Fedora.
3) Router (connected to the eth1 in desktop) acts also as DHCP server, that assigns IP addresses for all (but already static-assigned desktop) connected computers (no mater, cable or WiFi). Newly connected computer receives IP of 192.168.0.x, where x lies within range 3..63 (1 and 2 are reserved for desktop and laptop itself, respectively), mask of 255.255.255.0 and gate / DNS of 192.168.0.1
4) Both laptops have enabled DHCP (one uses XP, while the other uses Fedora 14 32bit)
When i connect laptop, it receives IP / mask properly from router's DHCP, but i have no idea how to configure desktop to route I-net packets from eth1 to eth0. First thing i've made was to enable IP forwarding, by adding line.
Code:
Code:
For the moment i have two questions:
1) How to check whether internet packets are routed properly ?
2) How to enable (or "route") DNS ? Is there a need to configure DNS on desktop ? Or somewhat DNS packets can be "routed", since during eth0 autoconfiguration it already receives DNS addresses from i-net provider ?
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Mar 18, 2010
I am using Ubuntu 9.10. I just got a Linksys WRH54G wireless router. I want to protect my wireless connection by putting a password to it but when I enter the Router's default IP address (192.168.1.1) into my browser to open the 'Utility Welcome screen', the browser does not respond.
According to the Router's manual this is because PC' TCP-IP is not set to automatically obtain the IP address.
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Jun 11, 2010
I recently bought a dell inspiron 14 n4010 and i've installed windows and Ubuntu 10.04 in it. The problem is that i'm not able to access internet in my ubuntu. I'm using asianet broadband connection and i'm able to get internet in my desktop when i connect the cable to the system. But when i did the same with ubuntu 10.04 in my laptop, i'm not able to get internet access. I'm able to access internet in windows though. But i hate using windows.
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Nov 4, 2010
way of life and am having trouble accessing the internet.
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Mar 4, 2010
I'm having problems in accessing a storage device (NAS 200 Linksys) in a network via Ubuntu. I think the problem is with the configuration of Samba.
On my computer the login and password are the same in Ubuntu (9.04), samba and Win XP.
Under windows I view the device in the network and, when I click on its icon, a window opens with the directories that have access.
Under Ubuntu, I can see all the computers in my workgroup and the device. However when I click on its icon only a blank window is opened.
I share printers without problems.
In my settings for the samba security = user.
Does anyone know if there is any configuration that allows access to the NAS?
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Apr 22, 2010
how to configure a bridged connection in where we are required to enter username and password.I am currently using PPOE type connection of my modem(A Nokia siemens ADSL modem).
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Jun 18, 2010
I have latest ubuntu and I have made 3 vm's for them.
VM 1: with 2 NIC cards, one is NAT connected directly through my host machine to the internet with ip address 192.168.190.142. Second NIC card is "host only" with ip address 192.168.0.10
VM 2: with 1 NIC card, "host only" and ip address 192.168.0.100
I want VM 2 to connect to the internet but through VM 1. for this I used following configuration in
Code:
/etc/network/interfaces,but it is not working[code]....
I have given my VM 2 the gateway of VM 1 but it is not going through.P.S: both machines are pinging each other properly.
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Aug 2, 2010
Our router is pretty old and only capable of giving fixed ip and there is no support for IPv6. Via the gnome networkmanager I try to set a manual IP to 192.168.1.123 and a netmask to 255.255.255.0 and a default gw at 192.168.1.1 . However, this does not work.
If I open a terminal and type:
Code:
sudo ifconfig eth0 inet 192.168.1.123
sudo route add default gw 192.168.1.1
Then I get a perfectly valid connection to the internet.
ifconfig by it self returns:
[Code]....
ffor me it seems that the gnome network manager doesn't save the information that I gently ask it to.
I can fix it with the CLI commands, but I would like to know whats going on.
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Feb 14, 2011
entries for connecting to broadband. Was OK with ubuntu 8.04 which had boxes for DNS server, etc. The 10.04 asks for MAC address (?) and there is a space for "DHCP client ID". I don't understand these terms. how I may proceed, especially exact syntax for any command line work. I am in Chennai/Madras, and have a BSNL wired broadband connection to my Dell laptop.
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Jun 18, 2010
I have latest ubuntu and I have made 3 vm's for them.
VM 1: with 2 NIC cards, one is NAT connected directly through my host machine to the internet with ip address 192.168.190.142. Second NIC card is "host only" with ip address 192.168.0.10
VM 2: with 1 NIC card, "host only" and ip address 192.168.0.100
I want VM 2 to connect to the internet but through VM 1. for this I used following configuration in
Code:
/etc/network/interfaces
but it is not working
Code:
auto lo
iface lo inet loopback
auto eth1
code....
I have given my VM 2 the gateway of VM 1 but it is not going through.
P.S:
both machines are pinging each other properly.
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Feb 16, 2011
"Need help with entries for connecting to broadband. Was OK with ubuntu 8.04 which had boxes for DNS server, etc. The 10.04 asks for MAC address (?) and there is a space for "DHCP client ID". I don't understand these terms. I will appreciate some step-by-step instruction or example of how I may proceed, especially exact syntax for any command line work. I am in Chennai/Madras, and have a BSNL wired broadband connection to my Dell laptop." I have repeated what I tried in the ubuntu forum without success. I'm really in newbie category, and not comfortable with computer or internet jargon. I can still connect with ubuntu 8.04 and firefox, just once daily. In a later post I also added: In Ubuntu 8.04 there was a system> admin> network tab (missing in 10.04). In the connections tab "wired" was checked. The general tab had my computer name (tsq-laptop) for host, and a blank box for domain name. The DNS tab had 192.168.1.1 in the servers box (presumably my service provider BSNL), and nothing in search domains. The hosts tab had a list of IP addresses and aliases, the first few being:
127.0.0.1 - local host
127.0.1.1 - tsq-laptop
::1 - ip6 local host ip6 loopback
fe00:: - ip6 localnet, .... (and a few more such I think most (or all) of these entries were generated automatically by the system, since I don't understand the jargon at all! I don't recall having any difficulties then, some two years back.Before that I had major problems in using the internal modem for a dial-up connection, but got detailed help by e-mail/internet from some really knowledgeable people in Europe and elsewhere regarding linmodem configuration, which I followed blindly and it worked!
In 10.04 there is only the taskbar icon to edit settings, and it has a different structure. It asks for MAC address (example 00.11.22.33.44.55). Other info required is IPv4 settings, DHCP client ID, about routers and other stuff. There may be other system settings to be made, which I can try with proper guidance. The ubuntu help page gives very sketchy information, and the images are not clear at all. No response to that till second day. Subsequently: In the 'wired' tab the 'routes' button popped a table where I entered address as 127.0.0.1, and netmask as 255.0.0.0, leaving gateway and metric blank. This is all geek stuff for me - I'm an old-fashioned engineer from the slide-rule era!
Should all this have been in the newbie forum? Thanks, =TeeSquare=
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Oct 16, 2010
I have two interfaces, gprs0 and gprs1, both connected to the Internet from the same HW device, but through two different access points I just read another blog entry with a guy who had two network cards, using one as a back up - I guess this is a little similar, but should be much easier I am guessing - I am just lost Using ifconfig (IP address given by the network) and route to setup the connection,
ifconfig gprs0 10.20.30.40 up
route add default dev gprs0
ping 66.102.7.99 works fine
afterwards
[code]....
There is data being transmitted and received to device again, I guess the kernel just doesn't know where the incoming data should go without the correct routing tables? Or what exactly is going on?The question I have is how do I configure the device to do the correct routing, using only the ifconfig and route commands? Maybe too trivial for you guys, but I am getting tired of goofing around not knowing what is up and down anymore
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How to configure SQUID proxy server in ubuntu 9.10 ?
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Feb 12, 2011
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Apr 28, 2011
Where can I find details of how to set up a Huawei E173 on Natty? The network interface's status icon shows first "waiting for authorization" then it goes to "not connected" The modem hardware is showing up when it is plugged in:
Code:
$ ls -la /dev/ttyUSB*
crw-rw---- 1 root dialout 188, 0 2011-04-28 19:18 /dev/ttyUSB0
crw-rw---- 1 root dialout 188, 1 2011-04-28 19:18 /dev/ttyUSB1
crw-rw---- 1 root dialout 188, 2 20$ lsusb|grep Huawei
Bus 001 Device 013: ID 12d1:1436 Huawei Technologies Co., Ltd. 11-04-28 19:18 /dev/ttyUSB2 What needs to be done to get it working?
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Nov 3, 2010
I am using 3 machines in a LAN connected through a hub. My intention is to have a end-to-end connection between 2 machines so that I can control delay/loss rate. For that purpose, I am using a 3rd machine with 2 NIC and intend to use a bridge and installing Dummynet in this machine to control the traffic between the other 2 machines.I have successfully installed Dummynet in the bridge machine. Now I require to configure Ethernet bridge in the machine. What is the process? Do I need a kernel compilation or can be done without it? read somewhere that recent kernels can be configured without recompilation.I am using Mandriva 2010 with 2.6.31.5-desktop-1mnb kernel.
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May 11, 2011
I have just clean installed Ubuntu 11.04 on 3.06 GHz Dual core P4 with 2GB RAM
Code:
jim@venus:~$ uname -r
2.6.38-8-generic
At the same time I purchased a Gigabit NIC from D-Link, mostly because D-Link is a reputable brand and it said on the box compatible with 2.6.x linux kernal. The original NIC is still in the system and can be seen and is functioning as eth0. The system can see the new driver and the card, here is an extract from dmesg:
[ 1.401350] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
[ 1.401390] r8169 0000:02:02.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18
[ 1.401437] r8169 0000:02:02.0: (unregistered net_device): no PCI Express capability
[ 1.403219] r8169 0000:02:02.0: eth1: RTL8169sb/8110sb at 0xf8016c00, 5c:d9:98:45:8b:cc, XID 10000000 IRQ 18
and lspci:
02:02.0 Ethernet controller: D-Link System Inc DGE-528T Gigabit Ethernet Adapter (rev 10)
02:04.0 Ethernet controller: VIA Technologies, Inc. VT6105/VT6106S [Rhine-III] (rev 86)
and ifconfig:
eth0 Link encap:Ethernet HWaddr 00:1e:58:9a:1b:0e
inet addr:192.168.11.65 Bcast:192.168.11.255 Mask:255.255.255.0
inet6 addr: fe80::21e:58ff:fe9a:1b0e/64 Scope:Link
[code]...
so as you can see dead as a door nail, no lights on the card and not picked up by the switch. How do I make this operate?
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Mar 26, 2011
I am using ubantu 10 and broadband where userid and passwd has been configured in router box. So when I connect this from windows its automatically connected (using ppp0e and dhcp), whereas in linux it could not connect.
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Jul 22, 2010
I have an ARM based linux machine with kernel 2.6.10 .On reset it automatically gets the IP address 192.168.1.2 . I want it to wake up with address 192.168.35.133 .In /etc/network/interfaces was only an interface for loopback:auto loiface lo inet loopbackI have added:auto eth0iface eth0 inet staticaddress 192.168.35.133netmask 255.255.255.0But on next reset the IP was still 192.168.1.2
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Apr 21, 2010
is there a possibility to connect to my router admin zone from internet using wan ip? from lan I can do that using 192.168.x.x IP but when Im in work and something go wrong at home how can I check configuration of my router from outer world instead of lan?
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Apr 16, 2010
I have a system with one (sometimes two) ethernet ports, that works happily in an old Fedora 5 build. But I can't get it to work on a new Centos 5.4 build. Original system: One dedicated ethernet port on card always connected to the systems dedicated equipment and no external access (the system is the DHCP master for that network). An optional second USB dongle that is a second ethernet port, used for debugging and development. (This is a DHCP client with full conectivity. In /etc/sysconfig/network-scripts I have ifcfg-eth0, ifcfg-eth1 and a route-eth0. Neither of the ifcfg files needs an explicit HWADDR, which means the same ones work for all boxes. And when one needs to be connected to the network all is fine.
The system is being moved to Centos 5.4, most is working with minimal change, but I am having problems with the ethernet ports. If it only has the on board ethernet connected, all is fine. If you have the USB dongle connected things go wrong: This system brings up the USB ethernet first, and tries to assign it to eth0 (which fails), and then brings up the on board ethernet as eth1 (which also fails). I have tried forcing the behaviour of the network by setting the HWADDR(s), but this does not result in the on board coming up as eth0, it comes up as __tmpxxxx as follows:
ifconfig -a
__tmp226406138 Link encap:Ethernet HWaddr 00:80:66:07:A8:63
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
[Code]...
Currently the only solution is to unplug the USB dongle through restart and plug in afterwards, and this wont work when the unit is remote and in the field.
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Mar 3, 2009
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Feb 11, 2010
i am trying to configure my NIC to support pause frames(rx on tx on)but it returns error:
ethtool -a eth0 returns error : Operation not supported I need to enable pause settings so as to make my point to point link lossless
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Mar 22, 2010
Recently my motherboard went out, I replaced it and booted centos 5. All went well except sound, video tuners and netoworking. The sound I re-configured, and have gotten tuners working but I am running into trouble with the new network card. The networking setup is;
DSL wireless router/modem IP 192.168.0.1 connected to XP computer through WIFI IP 192.168.0.3. all set to subnetmask 255.255.255.0 and with DNS servers 192.168.0.1 and 205.171.3.25 the XP computer is the only one that supports my wifi card. On wired LAN I share that connection to 4 devices. 3/4 work well, my cent os 5 box will not connect. here are the lan settings:
win xp: IP 192.168.0.60 255.255.255.0
mac 8.6: IP 192.168.0.34 255.255.255.0
blueray: IP 192.168.0.65 255.255.255.0
[code]....
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Apr 6, 2010
1. My machine [running Karmic Koala] is part of a corporate LAN with NIC details below
Quote:
2. My routing table:
Quote:
3. The network printer's details [as read from the printer's display interface]:
Quote:
My question:
This printer can be discovered by windoze machines using "Find printers" and then added. [Am not sure how this works!]
But when I try to discover the same from my ubuntu machine, its not getting discovered. Tried pinging the ip [172.20.254.158] which gives the following:
Quote:
Now I tried fiddling around with the route command along with good amount of googling but to no avail.
1. Is there a way I could add that printer to my machine?
2. If yes, how could I? Does it involve adding routes?
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