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Linux - Networking This forum is for any issue related to networks or networking.
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Old 10-22-2009, 01:50 AM   #1
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Registered: Oct 2009
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how to setup 2 separate net cards

I am building a network monitor/analyser in a linux box (Ubuntu server 8). It basically logs ip traffic.

I have installed two network cards, and they are identified by the system
as eth0 and eth2. My problem is I want them to be completely independent of each other - each with its own ip, etcetera. When I
try to do this, it looks like it should work, but the physical cards
respond to each others ip address. This is confusing. I want one
card to be my regular LAN connection, the other to be dedicated
to data collection (promiscuous mode).

Any ideas on why this might be happening, and where I should look to
fix it? Thanks for your attention.

Last edited by sfohelp; 10-22-2009 at 01:53 AM.
Old 10-22-2009, 03:59 AM   #2
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Registered: Jan 2006
Location: Ireland
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Let me clarify: your problem is that

1. the shortest route between your 2 cards is along the pci bus, and the pc has noticed that.
2. card a responds to the ip for card b?
1. Maybe a virtual box for eth2? Maybe another box for eth2?
2. Have you ethernet bridging set up? Are they both logged into the same server? What does your routing table show?


config, hardware, network

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