Ubuntu Networking :: Unable To Run 2 Ethernet Connections At The Same Time

Mar 7, 2010

I have a workstation with the two ethernet ports (eth0, eth1), the problem is that i cannot run with both ports up and running. I can run with either one of them, but not both.

Below is the contents of my /etc/network/interfaces file:

Code:

Running on 64 bit Ubuntu 9.10 Desktop

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I have two internet connections. One is wired ADSL Broadband & another is USB EVDO modem. I can use only one source at a time. That means the traffic will pass through either ADSL or EVDO. Other connection just sits idle. I want to use both the connections together so that I will have increased bandwidth. Is there a way to do that?

My computer has one NIC card. Both ADSL & EVDO use dynamic IPs.

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I've been struggling with this a bit now, and I'm not sure what the problem is. I have a laptop with a BCM4401 Ethernet card as well as a BCM4311 Wireless card. The wireless card works great out of the box, I'm able to connect with it perfectly. The problem is the ethernet card. Here is the situation: The NetworkManager menu doesn't list "Wired Networks" at all (ie. it doesn't say "not managed", it just only lists Wireless networks) Going into Network Connections, there is an "Auto eth0" entry ifconfig shows eth0 (which I assume means NetworkManager isn't managing eth0) I have edited /etc/NetworkManager/nm-system-settings.conf to say managed=true I have edited /etc/network/interfaces to remove any mention of eth0 (all that's left is the "lo" lines) So I'm not sure why eth0 is still showing up when I run ifconfig, and why Network Manager is not managing it. Any ideas?

Edit: Not sure what I did but now ifconfig spits out this:

Code:
eth0 Link encap:Ethernet HWaddr 00:1c:26:2c:60:75
inet addr:10.0.1.12 Bcast:10.0.1.255 Mask:255.255.255.0
inet6 addr: fe80::21c:26ff:fe2c:6075/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

[Code]...

The MAC address of the "Auto eth0" entry is 00:1C:23:8F:D4:39, the same as the eth1 entry that ifconfig spits out.

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I have an older Compaq Presario S6000CL, specs for it are here:

*Product Specifications Compaq Presario S6000CL Desktop PC - HP Customer Care (United States - English)

Motherboard and bios here:

*Motherboard Specifications, A7V8X-LA (Kamet 2) Compaq Presario S6000CL Desktop PC - HP Customer Care (United States - English)

I am trying to get SME Server set up as a private server/gateway. Problem is no matter what I do I can only get one ethernet working at a time and only to the internet, not the local network. I tried both SME Server 7.4 and 8.0 beta 5 witht he same result. Now of course I checked the ethernet cards. The two I have now on it do work. One of them is the onboard ethernet the other one is in the second pci slot. They jsut don't work at the same time. (also I am familiar with SME and I had it configured correctly. Even if I messed up the order of the cards it is easy enough to just get up and switch the cables, reboot, etc.) I thought maybe there was a jumper setting or an over ride of some sort to let me use two ethernet cards. <I previously had all of this set up with an old HP computer (came with windows 98 originally.) But that computer decided it was time to retire to the road side.> It seems that it should just work. Any ideas on what I am missing or what I can do?

Edit:Spent another hour trying to get it to work and still nothing. It is picking up both ethernet cards just fine, I just updated sme 8 beta5 so the internet is working fine. I just can't get the local ethernet card to do anything at all, even though it is showing up as a green ok at boot. I checked the bios and I am not seeing anything there. It had an option to enable/disable LAN (which is enabled but I tried both and using to PCI ethernet cards. Didn't do anything different.) It has a Local LAN boot rom option, tried it enabled and disabled (Disabled now.) and nothing. I turned off the serial and parallel ports (doesn't make a difference either way.) I looked all over the motherboard and the only thing I can find is the jumper to reset the password. If a computer that was at least 12 years old could run SME and don't see why this one can't, it is half that age and a much better computer hardware wise.

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I am using RHEL6 on a server with 3 interfaces.

eth0 is connecting via a Cisco switch to the outer world and eth1 and eth2 to internal networks.

eth1 and eth2 are working without problems all the time, however I have the following incident with eth0: although it is RUNNING, and after it works for some time (like some hours), it then becomes incapable of sending/receiving traffic. Here are more details, after the interface exits the RUNNING state:

[root@mgt ~]# ifconfig eth0
eth0 Link encap:Ethernet HWaddr E4:1F:13:6C:87:74
inet addr:9.162.91.26 Bcast:9.162.91.255 Mask:255.255.255.0
inet6 addr: fe80::e61f:13ff:fe6c:8774/64 Scope:Link
UP BROADCAST MULTICAST MTU:1500 Metric:1

[Code]....

I am wondering whether there this is because there is not traffic for some time and so the interface goes to idle. Is there any parameter I can tweak in RHEL6 to force the interface to remain RUNNING even in the absence of traffic (although I would be expecting that some 802.1 packets would be periodically flowing from the switch to the interface)?

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I have 2 LAN ports. one from the motherboard (on board) and the other from a lan card i bought a few days back. one is use for browsing the net, the other for a media player.

problem is i cant connect to both the eth0 and eth1 at the same time. i have to disconnect one of them to connect to the other. and this really gets irritating as it doesnt always work as flawlessly as it should. what am i doing wrong?

Output of "ifconfig":

Quote:

I'm on ubuntu desktop 10.10 64 bit.

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[Code]....

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I have a 64bits laptop with dual boot (Vista + Ubuntu 9.10) and nVidia chipset. Earlier, I could connect to internet using both the OSs. But now, when I insert the network cable (RJ-45) in the network port, neither of the OSs recognises the network cable. When I click (left click) the network icon in ubuntu (in the right top corner of the desktop), it does not show any available ethernet connection.

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eth0 Link encap:Ethernet HWaddr 00:22:20:06:ac:19
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[Code]...

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07:00.0 Ethernet Controller: Atheros Communications Inc. AR5001 Wireless Network Adapter (rev 01)
Subsystem: Hewlett-Packard Company Device 137a
Flags: bus master, fast devsel, latency 0, IRQ23
Memory at c2000000 (64-bit, non-prefetchable) [size=64K]
Capabilities: [40] Power Management version 2

[Code]...

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