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I have a computer and its Motherboard has two LAN Ports like in this image:

enter image description here

I have two other computers that I would like to connect to this computer.
How should i do this?

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up vote 2 down vote accepted

If the Internet connection is not important, all you need is a pair of crossover UTP cable. Then, connect server with the client PC's, and configure IP's on every host. Simplest way, is to go with something like

  • for server
  • for PC1
  • for PC2

For such network, mask is not very important, but you must use max. 29 bit mask ( This mask MUST be the same on every host (both server and clients). You don't need to set up default gateway nor DNS servers.

And done.

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thanks for helping but server has two Ethernet port i should assign for both of them? – Milad Sobhkhiz Sep 17 '11 at 20:29
Damn, right. Each interface must have its own IP address, so on server i.e. eth0 -, eth1 - – mcmajk3l Sep 17 '11 at 20:34
is important to use crossOver cable? – Milad Sobhkhiz Sep 17 '11 at 20:39
It depends on cards installed on your device. If they support auto mdi(x), it's not necessary to use crossover. If not, simple, straight-through cable won't even work. Best way to check this, is to connect two of these computers with a straight-through cable. When LED's won't even blink - you need crossover. ;) – mcmajk3l Sep 17 '11 at 20:44
I'd recommend using a hub or switch, if you want each computer to be able to talk to the other. – Daniel R Hicks Sep 17 '11 at 21:02

If you want this computer connected to the internet then you will have to connect all three up to a switch, if the server, or other device on the networkm is acting as a DHCP then they will pick up addresses from that, if not you will have to assign them.

You could also mess about connecting the LAN ports of the 3 PC's with ethernet cables (Might have to be crossover cables depending on the NIC's available) Set the IP addresses into a correct range and they should all be able to communicate with each other.

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Easiest is the router/switch, which you can pick up from a store. Or get one used from Craigslist for practically nothing. – Keltari Sep 17 '11 at 19:43
No. internet is not important. – Milad Sobhkhiz Sep 17 '11 at 19:47
I want just connect thise clients to this server and i request you for say step by step – Milad Sobhkhiz Sep 17 '11 at 19:48
For step-by-step, we're gonna need to know the Operating Systems on the server and the two other computers – Canadian Luke Sep 17 '11 at 19:53
i want know about networking steps. – Milad Sobhkhiz Sep 17 '11 at 20:08

You do not need to set interfaces to correct addresses unless you are using a Server Operating System which has default IP addressing TURNED OFF. By default, workstation operating systems - Linux, OSX, Windows, have default IP addressing TURNED ON. (and it's been that way for many years now). EVEN IF THERE IS NO DHCP MODEM/ROUTER, workstations by default will all choose interoperable IP addresses and subnet.

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