Recommended configuration for Oracle VM Server and VM Manager

Hi,
Currently we have two dedicated DELL servers (VM server and VM Manager) for which are building an Oracle stack environment.
We are facing a problem which we didn't find answer from Oracle docs or via Google. The problem is that the virtual machines we create in VM Manager can't be connected to the outside world, and we think it's because our host (Hetzner) does not allow ports eth1-eth3 to be connected to the servers, unless we have these servers in the same rack and connected via switch.
Our question is, is it recommended configuration to have VM Server and VM Manager servers in the same rack and connected via switch?
If yes, the next question is, if we need in the future to add one more dedicated DELL server to our configuration to host virtual machines, is it possible if the new third dedicated DELL server is not connected via switch to the two dedicated DELL servers we have already have?
If no, the next question is, what could be the recommended configuration and solution to our problem in our case that ports eth1-eth3 cannot be connected to the servers?
Please do not hesitate to ask if you need more information. I do appreciate your time and expertise. Thanks.

The architectural environment is now done like on this graphic. For security reasons Hetzner hosting service does not allow ports eth1-eth3 to be connected, but in internal network under switch they do.

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[2015-05-04T11:43:48.0653+02:00] [OHS] [NOTIFICATION:16] [OHS-9999] [mod_weblogic.c] [host_id: dev-oep-soalb-1] [host_addr: 192.168.0.226] [pid: 18651] [tid: 140166670751552] [user: app] [VirtualHost: main] WebLogic Server Plugin version 12.1.3 <WLSPLUGINS_12.1.3.0.0_LINUX.X64_140421.1459>
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[2015-05-04T11:48:53.9584+02:00] [OHS] [INCIDENT_ERROR:32] [OHS-9999] [worker.c] [host_id: dev-oep-soalb-1] [host_addr: 192.168.0.226] [pid: 18838] [tid: 140103489120064] [user: app] [VirtualHost: main] (98)Address already in use: make_sock: could not bind to address 192.168.0.226:80
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        at weblogic.nodemanager.server.ServerMonitor.startProcess(ServerMonitor.java:441)
        at weblogic.nodemanager.server.ServerMonitor.runMonitor(ServerMonitor.java:406)
        at weblogic.nodemanager.server.ServerMonitor.run(ServerMonitor.java:295)
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#Wed Apr 29 18:31:26 CEST 2015
#Node manager properties
#Wed Apr 29 17:18:21 CEST 2015
DomainsFile=/opt/app/soalb_domain/nodemanager/nodemanager.domains
LogLimit=0
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LogLevel=INFO
DomainsFileEnabled=true
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LogToStderr=true
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Regards,
András

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http://download.oracle.com/docs/cd/E13222_01/wls/docs92/config_scripting/reference.html
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http://middlewaremagic.com/weblogic/
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