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VMWare server 2.02 configure virtual network within host

Posted on 2010-11-12
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Last Modified: 2012-06-27
I Currently have a Host server connected to my LAN on a 172 network and I also have a couple Virtual servers running on that host with bridged networks.  I need to create a couple more virtual servers on the same host server using the Host only option.  The concern I have is that these new host only virtual servers need to be isolated from the  LAN 172 network but I still need the virtual network to be on the same 172 ip subnet.  First  I am concerned that if I change the DHCP for VMnet8 (currently defined with a 192 subnet) to the same 172 network will that cause problems with my existing bridged Virtual servers? Will my new "Host only" Virtual servers connect to the same bridged 172 networks or will they be in their own 172 virtual network?  Whatever I do I do not want to disrupt my current bridged Virtual Servers.
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Question by:djpierce54
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by:justadad
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I assume that you are trying to mirror your production systems for some kind of test.  I have done that before.

Your currently bridged servers will be fine, however your VMWare host can not talk to the VMs / computers on both networks.  That would be an IP routing issue there. You could even lose your ability to connect to the host.

In the past I did something similar for a test network.  I did want the files to be able to be transferred so here is what I did. Note no Internet access for the Guests unless you use NAT on guest 3 which I can explain if you need.

VMWare Host with IP address on VMNet8 192 subnet
Guest 1 - Clone of Prod Server 1 - with Host only connection and static IP address on 172 yet VMnet8
Guest 2 - Clone of Prod Server 1 - with Host only connection and static IP address on 172 yet VMnet8
Guest 3 - One new Guest with 2 IP addresses on same VMNet8 network 192 and 1 on 172 (either 2 addresses one card or 2 cards) but does NOT do routing. - Use the new Guest as file repository for files placed from the VMWare Host and from the VMWare Guests.

If needed you can create even more VMNets if that helps you relate and create on that the VMWare Host doesn't even have an IP address on.  ie make the 172 actually VMNet7 with the VMWare Host having NO ip address on it. Then Guest 3 would have 2 ethernet cards 1 on VMNet 7 and 1 on VMNet8.
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by:djpierce54
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Sorry for the delay in getting back.
I setup the two Host Only and that works fine.  As expected they can see each other but nobody else. I assume that then the Guest 3 will allow me to grab files from the Host machine (which has internet access) and be able to copy through Guest 3 to Guest 1 and 2.  I added a second adapter to Guest 3 and set it to bridged.  Now that machine does see Guest 1 and 2 but it also sees the host and the remainder of my LAN.  I would prefer to only have Guest 3 see the Host but not the LAN.  Is that what you meant by setting up VMNet7. If so, do I add VMNet7 as another host and then setup a new DHCP and NAT address field different from VMNet8?  Then attach the the second adapter on Guest 3 to VMnet7?  Am I heading in the right direction?
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Yes....Or I should have thought about this earlier.  Add the second NIC for Guest 3 to the NAT VLAN.  That would do it. You don't need to create another VLAN...just use the NAT VLAN for it.  Only reason to create and use a VMNet7 was to make sure that the Host couldn't talk to the 2 Guests at all....but you have that working so no need to change it.
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by:djpierce54
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Perfect.  Up and running just the way I wanted it Thanks for the info.
Now I know enough to get me into trouble
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