Gnall Networking in VMware Workstation 8 READ Using Vmware Workstation 8 Manual Chapter 5 -...

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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

Networking in VMware 2

Gnall

Virtual Networks

• Ten virtual "switches" which define ten virtual networks– VMnet 0 - VMnet 9– Switches are actually hubs

• All attached devices are in one collision domain• All VMs see all packets

– 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:

• 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– VMnet 2, 3, 4, 5, 6, 7 and 9

• Pre-configured Switches (see next three slides)– VMnet 0 Bridged

• connected directly to the physical network– VMnet 1 Host-Only

• 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• 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

Networking in VMware 3

GnallNetworking in VMware 4

VMnet 2, 3, 4, 5, 6, 7, 9 (custom)

VMnetX

Switch(Hub)

Guest OS VMVirtual NIC

(Network Adapter)


(Network Adapter)


VMnet 0 - Bridged (pre-configured)

VMnet0

Switch(Hub)


(Network Adapter)

Host OSPhysical NIC

Bridge


(Network Adapter)

PhysicalLAN


VMnet 1 - Host-Only (pre-configured)

VMnet1

Switch(Hub)


(Network Adapter)

VMwareDHCP Service

Host OSVirtual NIC

(Virtual Adapter)


(Network Adapter)

Host OS


VMnet 8 - NAT (pre-configured)

VMnet8

Switch(Hub)


(Network Adapter)

VMwareDHCP Service

Host OSVirtual NIC

(Virtual Adapter)

NAPT / GatewayDNS / WINS Proxy

Host OSPhysical NIC


(Network Adapter)

Host OS

PhysicalLAN

VMs share the host's MAC and IP address


Connecting Multiple Switches

VMnet 3Switch

RouterXP

N NI IC C1 2

DHCPService

(a)

VMnet 2Switch

XPB

N IC

XPA

NI C

DHCPService

(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.


Virtual Network Components - All

VMnetX

Switch(Hub)


(Network Adapter)

VMwareDHCP Service

Host OSVirtual NIC

(Virtual Adapter)

Host OSPhysical NIC

Bridge


Host OSPhysical NIC

PhysicalLAN


(Network Adapter)

Host OS

PhysicalLAN


VMnet 2-7, 9 (custom)

VMnet2 - 7, 9Switch(Hub)


(Network Adapter)

VMwareDHCP Server

Host OSVirtual NIC

(Virtual Adapter)

Host OSPhysical NIC

Bridge


Host OSPhysical NIC


(Network Adapter)

Any combination of VMware provided virtual network components can be added to any of the custom switches.

Host OS

PhysicalLAN

PhysicalLAN


Customize Virtual Network Settings

Edit Menu…Virtual Network Editor… (this is dangerous - be careful)


Customize VMware NAPT Router

Edit…Virtual Network Editor…NAT Settings…– 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


Customize VMware DHCP Server

Edit…Virtual Network Editor…DHCP Settings…DHCP scope can be configured

DHCP lease time can be configured


Virtual Network Components• Switch

– 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)

• Network Adapter– 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– 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– 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)


Virtual Network Components• Host Virtual Adapter

– 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.

– 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

– In essence, installing VMware causes the host OS to become multi-homed.

– 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.

– Additional virtual network adapters can be installed in the host OS.

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