Networking in VMware Workstation 8
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Using Vmware Workstation 8 Manual
Chapter 5 - Configuring Network Connections
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Ten Virtual Networks
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Virtual Networks
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Ten virtual "switches" which define ten virtual networks
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VMnet 0 - VMnet 9
Switches are actually hubs
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Any number of virtual machines can be connected to a switch
Seven switches (2, 3, 4, 5, 6, 7, 9) provide isolated networks with no pre-attached devices
Three switches (0, 1, 8) are preconfigured with some combination of the following:
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Direct bridged connection to the physical network
NAPT connection to the physical network with DNS and WINS proxy
Internal connection to virtual NIC on the physical host
VMware DHCP server
Custom Switches - no pre-attached devices
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All attached devices are in one collision domain
All VMs see all packets
VMnet 2, 3, 4, 5, 6, 7 and 9
Pre-configured Switches (see next three slides)
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VMnet 0 Bridged
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VMnet 1 Host-Only
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connected directly to the physical network
connected directly to the physical host via a virtual NIC installed by VMware in the physical host
connected to VMware DHCP server
VMnet 8 NAT
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connected directly to the physical host via a virtual NIC installed by VMware in the physical host
connected via NAPT to the physical network with DNS and WINS proxy
VMs share the physical host's MAC and IP address
connected to VMware DHCP server
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VMnet 2, 3, 4, 5, 6, 7, 9 (custom)
Guest OS VM
Virtual NIC
(Network Adapter)
Guest OS VM
Virtual NIC
(Network Adapter)
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VMnet
X
Switch
(Hub)
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VMnet 0 - Bridged (pre-configured)
Guest OS VM
Virtual NIC
(Network Adapter)
Guest OS VM
Virtual NIC
(Network Adapter)
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VMnet
0
Switch
(Hub)
Bridge
Host OS
Physical NIC
Physical
LAN
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VMnet 1 - Host-Only (pre-configured)
Host OS
Virtual NIC
(Virtual Adapter)
Guest OS VM
Virtual NIC
(Network Adapter)
Guest OS VM
Virtual NIC
(Network Adapter)
Host OS
VMnet
1
Switch
(Hub)
VMware
DHCP Service
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VMnet 8 - NAT (pre-configured)
Host OS
Virtual NIC
(Virtual Adapter)
Guest OS VM
Virtual NIC
(Network Adapter)
Guest OS VM
Virtual NIC
(Network Adapter)
VMware
DHCP Service
VMnet
8
Switch
(Hub)
VMs share the
host's MAC and
IP address
NAPT / Gateway
DNS / WINS Proxy
Networking in VMware
Host OS
Host OS
Physical NIC
Physical
LAN
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Connecting Multiple Switches
VMnet 2
Switch
VMnet 3
Switch
RouterXP
XPA
N
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1
N
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DHCP
Service
(a)
XPB
N
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2
N
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DHCP
Service
(b)
RouterXP could be a dual-homed Windows OS with routing enabled.
The DHCP services can either be VMware's built in DHCP service or DHCP Server VMs.
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Virtual Network Components - All
Guest OS VM
Virtual NIC
(Network Adapter)
Guest OS VM
Virtual NIC
(Network Adapter)
VMnet
X
Switch
(Hub)
Host OS
Virtual NIC
(Virtual Adapter)
Host OS
Bridge
Host OS
Physical NIC
Physical
LAN
Host OS
Physical NIC
Physical
LAN
VMware
DHCP Service
NAPT / Gateway
DNS / WINS Proxy
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VMnet 2-7, 9 (custom)
Any combination of VMware provided virtual network components can be added to any of the custom switches.
Guest OS VM
Virtual NIC
(Network Adapter)
Guest OS VM
Virtual NIC
(Network Adapter)
VMnet
2 - 7, 9
Switch
(Hub)
Host OS
Virtual NIC
(Virtual Adapter)
Host OS
Bridge
Host OS
Physical NIC
Physical
LAN
Host OS
Physical NIC
Physical
LAN
VMware
DHCP Server
NAPT / Gateway
DNS / WINS Proxy
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Customize Virtual Network Settings
Edit Menu…Virtual Network Editor… (this is dangerous - be careful)
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Customize VMware NAPT Router
Edit…Virtual Network Editor…NAT Settings…
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Can only be assigned to one virtual network at a time
Assigned by default to VMnet8 (NAT)
Router IP address can be configured
Port forwarding can be configured
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Customize VMware DHCP Server
Edit…Virtual Network Editor…DHCP Settings…
DHCP scope can be configured
DHCP lease time can be configured
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Virtual Network Components
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Switch
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Network Adapter
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Each VM is configured with a virtual NIC, which is connected to the virtual switch belonging
to a virtual network
In VMware Workstation 5.5, a maximum of 3 virtual NICs can be assigned to each VM
In VMware Workstation 6+, a maximum of 10 virtual NICs can be assigned to each VM
DHCP Service
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Total of 10 virtual switches
Switches are actually hubs, not switches - no MAC filtering, one collision domain
Use to connect other virtual components together, such as VMs, built in DHCP server, built in
NAPT device, host virtual adapter, bridge to physical network
An unlimited number of virtual components can be connected to a virtual switch
(theoretically, allows the creation of an infinite number of virtual network configurations)
Assigns IP numbers from the 192.168.Y.Z address space
Can be added to the other virtual networks
Each network is assigned a different subnet
The value of the third octet (Y) used for a specific network may be different for each
installation of VMware (depending on the version of VMware)
Assigned by default to VMnet 1 (host-only) and VMnet 8 (NAT)
Bridge
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Connects a virtual switch directly to the physical network
Additional custom bridges can be configured to simultaneously connect a virtual switch to
each physical network to which the physical machine is attached
Assigned by default to VMnet 0 (Bridged)
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Virtual Network Components
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Host Virtual Adapter
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In order for the host OS (not the guest OS) to connect to a virtual switch in VMware, and
thereby communicate directly with the VMs, it needs a virtual network adapter, with it’s own
IP and MAC address.
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When VMware is installed, the host OS will automatically be given two virtual network
adapters, one which is connected to the VMnet 1 (host-only) switch and one which is
connected to the VMnet 8 (NAT) switch.
These will be identified on the host OS (XP) as:
• VMware Network Adapter VMnet1
• VMware Network Adapter VMnet8
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In essence, installing VMware causes the host OS to become multi-homed.
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The host virtual adapters do not provide VMs access to the physical network unless a proxy
server is set up on the host OS to establish a connection between the virtual network adapter
and the physical NIC.
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Additional virtual network adapters can be installed in the host OS.
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