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IP allocation for KVM devices

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Old 06-04-2011, 08:52 PM
Eiv Eiv is offline
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IP allocation for KVM devices

Hi All

Right now, most of the new server equipment has built in KVM dedicated port. Whats the best pratice for assigning IP for each KVM devices? Do you assign a /30 with Vlan setup to prevent IP hijacking? But that would be wasting a lot of IP when you have hundreds of servers.

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Old 06-04-2011, 09:50 PM
Plutomic-Andrew Plutomic-Andrew is offline
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I'd recommend setting up a VPN and then simply use private addresses to access each KVM device. This would be much more secure than having them publicly facing and also save the addresses you do have for more important applications.

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Old 06-05-2011, 09:42 PM
Azar-A Azar-A is offline
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NAT-on-demand or VPN as said before

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Old 06-06-2011, 04:21 AM
EDIS EDIS is offline
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External IPs, easiest way - but depends on what device it is.

some are also able to share an IP.

Last edited by EDIS; 06-06-2011 at 04:25 AM. Reason: .
Old 06-06-2011, 04:27 AM
TheLie TheLie is offline
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NAT, Customers get access over their Port (Supermicro/HP) or over a single interface that contains all servers (Dell/IBM/Towers/NoName).

We use 1 IP for all SM/HP Servers (we soon need one more, as we run out of ports on that one ;-)) and around 10 IPs for external KVM switches (usualy 8 Port) and Dell/IBM KVMs.

Works fine, but is a hassle to setup at first (extra switches for the NATed network everywhere etc.)

Old 06-06-2011, 04:56 AM
CGotzmann CGotzmann is offline
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NAT sounds like a good idea, but it doesnt do much for security.
The best approach is private network addressing with a VPN tunnel, as well as router firewalling to only allow specific clients to access their designated subnets. This way no public traffic and no other clients can access each others IPMI's.

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Old 06-06-2011, 07:46 AM
funkywizard funkywizard is offline
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NAT isn't really viable for IPMI as the java client expects to be listening on a particular port. We put most of our IPMI on a private network that we access by remotely accessing a particular server on the network that is also connected to the private network. For customers who want IPMI, we make an exception and assign an ip from our pool to that ipmi and then we move the ipmi to the public network. If we had a lot of people who wanted public ipmi access, we'd definitely be looking into a vpn solution, both for security and also to cut down on wasting ips for this sort of thing.

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Old 06-07-2011, 09:11 AM
Gogax | Simon Gogax | Simon is offline
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I recommend a /29 per physical server. First ips for server and last usable ip for kvm.

This way each server is isolated within its own Vlan and you know that the last usable ip of each subnet is a kvm

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Last edited by Gogax | Simon; 06-07-2011 at 09:11 AM. Reason: edited text

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