How to distinguish virtual network card and physical network card?

One 、 What are physical network card and virtual network card ？

Here is the following ： The red part contains VMWare Of is virtual network card .

Usually , We deploy VMWare virtual machine 、VMSphere Virtual cluster 、XenCenter Virtual clusters involve virtual network cards .

Two 、 Identify the application scenarios of physical network card and virtual network card

Scene one ： Generally, when deploying virtual clusters .
Scene two ： Through packet capturing analysis, the source of the data request is the data packet sent by the physical network card , It is also used when sending packets from the virtual network card address . Identification is through mac Address sensitive .
Scene three ： Other scenarios that need to distinguish network cards .

3、 ... and 、 How to distinguish between physical network card and virtual network card ？

Method 1 ： Old fashioned and applicable only to windows operating system .

The principle is roughly as follows ：

First of all GetAdaptersInfo Get the basic information of all network cards . Then use the network card name to find the corresponding hardware information in the registry . If it is a physical network card , Its hardware information usually includes PCI .

for example , The name of a network card is {ACA306D0-1D69-4116-BC2B-919B428AD084}.

The location of his information in the registry is ：

HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Control/Network/{4D36E972-E325-11CE-BFC1-08002BE10318}/{ACA306D0-1D69-4116-BC2B-919B428AD084}/Connection

if PnpInstanceID The value of PCI start , Description is physical network card ,MediaSubType by 01 Is a common network card ,02 For wireless network card .

​

This method is only applicable to windows operating system , Not universal .

Method 2 ： comprehensive stackoverflow and github obtain （2016 year 10 month 8 Japan ）.

1、 Contains the following MAC Address before 8 Bytes （ front 3 paragraph ） It's a virtual network card ：

      
      

       
       "00:05:69"; //vmware1
       
       
"00:0C:29"; //vmware2
       
       
"00:50:56"; //vmware3
       
       
"00:1c:14"; //vmware4
       
       
"00:1C:42"; //parallels1
       
       
"00:03:FF"; //microsoft virtual pc
       
       
"00:0F:4B"; //virtual iron 4
       
       
"00:16:3E"; //red hat xen , oracle vm , xen source, novell xen
       
       
"08:00:27"; //virtualbox
      
      
      
      

       
       
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Take the following network card address for example ：

      
      

       
       Line 34: PhysicalAddress: 00:FF:C4:73:16:0D
       
       
Line 110: PhysicalAddress: 8C:89:A5:BD:1A:6A
       
       
Line 215: PhysicalAddress: 00:50:56:C0:00:01
       
       
Line 316: PhysicalAddress: 00:50:56:C0:00:08
      
      
      
      

       
       
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The last two are marked with 00:50:56 It starts with VMWare Virtual network card address .

Based on this ： The implementation is also very simple , Ideas as follows ：
After obtaining the network card address , Before judgment 8 Bytes , The list above the loop variable , If the former 8 Same bytes , To terminate the program , That is, the virtual network card address ; Otherwise, it is the physical network card address .

2、 The following links discuss the classification of virtual network cards ：

​ ​http://stackoverflow.com/questions/3062594/differentiate-vmware-network-adapter-from-physical-network-adapters-or-detect​​

3、 The following link gives the interface implementation of full classification of virtual network cards ：

​ ​https://github.com/LeMaker/android-actions/blob/6960890188f877ee2cd5d6dbf52b7de25be64085/android/external/chromium_org/chrome/browser/prefs/tracked/pref_hash_calculator_helper_win.cc​​

4、 May be in doubt ？

1） Will it be inaccurate if it does not include all .
Yes , Need to brainstorm , Collect more information , Make it as comprehensive as possible .

Four ： Summary

When I first started, I analyzed the data package , Architects can tell which is at a glance VMWare Sent by the machine , Now I know it's based on Mac The first few digits of the address come to the conclusion .
And I know this principle much later than architects 2 year , this , Maybe it's the gap and something worth working on ！

author ： Mingyi world