The difference between bridging, nat and host mode provided by VMWare virtual machines

VMNet0 (bridge mode), a cluster-free physical virtual network card, is actually just a quiet protocol infiltration bucket, which will add the VMware Bridge Protocol bridge protocol to the corresponding network card, which is relative to using a virtual switch to connect virtual machines and.

1. VMware bridging mode, that is, the virtual network adapter of the virtual machine is handed over to the physical network adapter of the host, and the virtual network adapter in the virtual machine can be directly accessed to the external network through the physical network adapter in the host (such as the LAN and Internet shown in the figure). In a nutshell, it's like adding a new, stand-alone computer to the LAN shown in the diagram above.

2. NAT is the abbreviation of network addresstranslation, which means network address translation. NAT mode is also the default network connection mode for VMware to create virtual machines. When using NAT mode network connectivity, VMware establishes a separate private network on the host to communicate with each other between the primary pure excitation machine and the virtual machine.

Bridge mode).

In the bridged mode, the host NIC communicates with the virtual NIC of the virtual machine using a virtual bridge. In bridging mode, the IP address of the VM needs to be in the same network segment as the host, and if the network needs to be connected, the DNS and DNS of the VM must be the same as the host NIC. This mode is suitable for situations where there is no barrier to communication with the host and other hosts on the local area network.

Network Address Translation Mode).

NAT mode uses a virtual NAT device and a virtual DHCP server to connect a virtual machine to the Internet. This mode is suitable for situations where there is a shortage of IP addresses in the network environment.

Sell only laughing limb host mode).

The host-only mode separates the virtual machine from the external network, making the virtual machine an independent system that only communicates with the host. This mode is suitable for some special network debugging work, that is, only the host can access the virtual machine, and the virtual machine cannot access the external network.

VMware on the difference between bridging and NAT:

1) Bridged networking: A bridge allows users to connect virtual machines to the local area network (LAN) where the host is located. This connects the virtual Ethernet switch in the virtual machine to the physical Ethernet adapter in the host;

2) NAT: Network Address Translation (NAT) devices allow users to connect virtual machines to an external network where there is only one IP network address and that address is already in use by the host.

VMware's several virtual appliances:

1. VMNet0: This is a virtual switch used by VMware for virtual bridging network;

2. VMNet1: This is a virtual switch used by VMware for virtual host-only networks;

3. VMNet8: This is a virtual switch used by VMware for virtual NAT networks;

4. VMware Network Adapter VMNet1: This is the virtual NIC used by the host to communicate with the host-only virtual network.

5. VMware Network Adapter VMNet8: This is the virtual NIC used by the host to communicate with the NAT virtual network;

1. Bridge network: The virtual machine can be simulated to be connected to the local area network where the host is located.

2. NAT network: In the NAT network, the VMware network on the VMNet8 virtual switch and host will be used

The VMNet8 virtual NIC adapter is connected to the VMNET8 switch to communicate with the guest, but the VMware Network Adapter VMNET8 NIC is only used to communicate with the VMNET8 network segment, it does not provide routing functions for the VMNet8 network segment, and the guest in the virtual NAT network is connected to the Internet using the virtual NAT server.

At this time, your guest and host can communicate with each other, and if your host is connected to the Internet at this time, then your guest can also connect to the Internet. So what role does the VMware Network Adapter VMNet8 virtual NIC play here? It only provides an interface for the communication between the host and the guest in the NAT virtual network, so even if the virtual NIC is disabled, the guest can still access the Internet, but the host can no longer access the vmnet8 network segment.

In this mode, the host needs to enable VMDHCP and VMNAT services.

How to set up the network connection (NAT mode and bridge mode) on the CentOS system installed on the virtual machine