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How To Setup Networking For KVM Guests

I have a server with CentOS 5.4 with 5 IPs. Now i want to spare 1 IP for the host, and create 4 virtual machines, each with 1 dedicated IP and has direct access to internet (virtual machines created with KVM come with NAT as default)

Anyone can point me to a tutorial or tell me how to setup networking for this ? Working over GUI is not possible since i only have ssh access and don't want to install X just to install things. Is it possible to use Xen networking scripts for KVM guests ? I have tested Xen on my server and its default networking setting worked ie with guests have direct connection to internet.

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(I read the sticky, I dont think this stuff are necessary but I posted them anyway:
Kernel Version: 2.6.9-22.ELsmp
Dual Xeon 3.20GHz with 2GB RAM, 120GB HD 10,000 RPM (Sorry for the un-detailed hardware)
[root@server ~]# vmstat 5 5
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
0 0 160 17132 6572 1930168 0 0 121 295 31 146 1 8 90 2
0 0 160 17132 6580 1930160 0 0 0 7 1020 589 0 1 99 0
0 0 160 17132 6580 1930160 0 0 0 0 1016 597 0 1 99 0
0 0 160 17132 6580 1930160 0 0 0 0 1020 601 0 1 99 0
0 0 160 17132 6580 1930160 0 0 0 0 1016 598 0 1 99 0

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Here is my last reply. I tried to make it real simple for them to understand.

This does not address the issues. Do you even know what a virtual
machine is? It is a virtual computer running on the host computer.
The host computer has a valid ip address of 70.xx.15.171, sm: gw: 70.xx.15.161. The virtual machines (or guest
operating systems) if I assign it the IP address of 70.xx.18.249 SM: with no gateway it is physically impossible for it to
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the Virtual Machine operates as a completely separate computer. It
requires its own gateway. with no gateway specified it has no way to
get out of its local subnet to get to the 70.xx.15.x subnet. What
happens if you put two physical computers on one hub. The computer on
port 1 of the hub has the IP info 70.xx.15.171 SM: GW
70.xx.15.161. The second computer is on port 2. It has the ip info
of: 70.xx.18.249 SM: GW: NONE.
How is the pc on port 2 going to communicate with the pc on port
1? This is the exact situation we are in. There has to be a
gateway to route the IP traffic from pc2 to pc1 to get onto the

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rcmProcessRipPortStatusMsg: port 7
rcmRequestRipTableEntry: port 7, chan 1
rcmProcessRipTableMsg: old packet type!
RIP STATUS(RipTable) port:7 chan:1 In0 On1 Rip1 UA1 Up0 STS=71
rcmProcessRipTableMsg: port 7, chan 1, swChannels 0
rcmProcessRipTableMsg: ERROR RIP not found!

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There are 2 versions of this KVM

- one with USBs only

- one with USB and PS/2

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Anyone know for KVM/IP solution with kvm switch which can solve our purpose of KVM.

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We are using a AdderLink IP which is connected to some AdderView Matrix KVM Switches.

The big problem is, that the AdderLink IP is quite slow switchting to the right screen resolution. This means, I have no chance to access the bios, because before I can press the DELL button to enter the bios, I have to syncronise the screen resolution to get access to the Keyboard and press the DELL button. But the syncronisation takes about 5 seconds and therefore I'm too late pressing the DELL button.

Now I search a better KVM-Over-IP box, which I can connect to my AdderView Matrix KVM Switches. It's very important, that I don't need to synchronise anything before I can use the keyboard.

Can someone recommend such a box which don't need to syncronize at all? Or how are other companies accessing the bios?

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Belkin KVM/IP Review
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The one I am looking at is this model:


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What's the latest KVM technologies that's easy to use and have fast response time?

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Wondering if anyone has used any of Startech's IP KVM products. In particular I am looking at the SV1115IPEXT here: [url]

What I am aiming for is a device that I can have remote hands just plug into a machine video, keyboard, mouse, and USE for remote image mounting (to simplify remote hands for the 'not so talented' 24-hour support in the DC).

Anyone have any experience using a IP KVM for this purpose? If so how well does it work for actually getting into the BIOS and booting off a remotely mounted image (considering the image is local on at least 100mbit ethernet)?

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Allot of these products like bare-metal installs though... which is why I'm particularly looking for "virtual media" on the KVM.

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