有关网卡操作的两个对象之一：

Win32_NetworkAdapterConfiguration   网卡配置信息

定义如下：

 1 class Win32_NetworkAdapterConfiguration : CIM_Setting 
 2 { 
 3 boolean ArpAlwaysSourceRoute; 
 4 boolean ArpUseEtherSNAP; 
 5 string Caption;//网卡名称 
 6 string DatabasePath; 
 7 boolean DeadGWDetectEnabled; 
 8 string DefaultIPGateway[];//默认网关 
 9 uint8 DefaultTOS; 
10 uint8 DefaultTTL; 
11 string Description; 
12 boolean DHCPEnabled; //是否启用DHCP
13 datetime DHCPLeaseExpires; 
14 datetime DHCPLeaseObtained; 
15 string DHCPServer; 
16 string DNSDomain; 
17 string DNSDomainSuffixSearchOrder[]; 
18 boolean DNSEnabledForWINSResolution; 
19 string DNSHostName; 
20 string DNSServerSearchOrder[];//DNS（包括主、备） 
21 boolean DomainDNSRegistrationEnabled; 
22 uint32 ForwardBufferMemory; 
23 boolean FullDNSRegistrationEnabled; 
24 uint16 GatewayCostMetric[]; 
25 uint8 IGMPLevel; 
26 uint32 Index; //网卡在所有网卡中的序号
27 uint32 InterfaceIndex; 
28 string IPAddress[];//IP地址 
29 uint32 IPConnectionMetric; 
30 boolean IPEnabled; //是不是启用IP
31 boolean IPFilterSecurityEnabled; 
32 boolean IPPortSecurityEnabled; 
33 string IPSecPermitIPProtocols[]; 
34 string IPSecPermitTCPPorts[]; 
35 string IPSecPermitUDPPorts[]; 
36 string IPSubnet[]; //子网掩码
37 boolean IPUseZeroBroadcast; 
38 string IPXAddress; 
39 boolean IPXEnabled; 
40 uint32 IPXFrameType[]; 
41 uint32 IPXMediaType; 
42 string IPXNetworkNumber[]; 
43 string IPXVirtualNetNumber; 
44 uint32 KeepAliveInterval; 
45 uint32 KeepAliveTime; 
46 string MACAddress; //MAC地址
47 uint32 MTU; 
48 uint32 NumForwardPackets; 
49 boolean PMTUBHDetectEnabled; 
50 boolean PMTUDiscoveryEnabled; 
51 string ServiceName; 
52 string SettingID; 
53 uint32 TcpipNetbiosOptions; 
54 uint32 TcpMaxConnectRetransmissions; 
55 uint32 TcpMaxDataRetransmissions; 
56 uint32 TcpNumConnections; 
57 boolean TcpUseRFC1122UrgentPointer; 
58 uint16 TcpWindowSize; 
59 boolean WINSEnableLMHostsLookup; 
60 string WINSHostLookupFile; 
61 string WINSPrimaryServer; 
62 string WINSScopeID; 
63 string WINSSecondaryServer; 
64 };

Win32_NetworkAdapterConfiguration 有如下方法：

方法名描述信息
DisableIPSec

Disables IPsec on this TCP/IP-enabled network adapter.
EnableDHCP

Enables the Dynamic Host Configuration Protocol (DHCP) for service with this network adapter.开启DCHP，使IP自动获取！
EnableDNS

Enables the Domain Name System (DNS) for service on this TCP/IP-bound network adapter.
EnableIPFilterSec

Enables IPsec globally across all IP-bound network adapters.
EnableIPSec

Enables IPsec on this specific TCP/IP-enabled network adapter.
EnableStatic

Enables static TCP/IP addressing for the target network adapter.关闭DHCP，手动设置IP、子网掩码
EnableWINS

Enables WINS settings specific to TCP/IP, but independent of the network adapter.
ReleaseDHCPLease

Releases the IP address bound to a specific DHCP-enabled network adapter.
ReleaseDHCPLeaseAll

Releases the IP addresses bound to all DHCP-enabled network adapters.
RenewDHCPLease

Renews the IP address on specific DHCP-enabled network adapters.
RenewDHCPLeaseAll

Renews the IP addresses on all DHCP-enabled network adapters.
SetArpAlwaysSourceRoute

Sets the transmission of ARP queries by the TCP/IP.
SetArpUseEtherSNAP

Enables Ethernet packets to use 802.3 SNAP encoding.
SetDatabasePath

Sets the path to the standard Internet database files (HOSTS, LMHOSTS, NETWORKS, and PROTOCOLS).
SetDeadGWDetect

Enables dead gateway detection.
SetDefaultTOS

Obsolete. This method sets the default Type of Service (TOS) value in the header of outgoing IP packets.
SetDefaultTTL

Sets the default Time to Live (TTL) value in the header of outgoing IP packets.
SetDNSDomain

Sets the DNS domain.
SetDNSServerSearchOrder

Sets the server search order as an array of elements.设置DNS服务器。
SetDNSSuffixSearchOrder

Sets the suffix search order as an array of elements.
SetDynamicDNSRegistration

Indicates dynamic DNS registration of IP addresses for this IP-bound adapter. This method is new for Windows XP.
SetForwardBufferMemory

Specifies how much memory IP allocates to store packet data in the router packet queue.
SetGateways

Specifies a list of gateways for routing packets destined for a different subnet than the one this adapter is connected to.设置默认网关。
SetIGMPLevel

Sets the extent to which the system supports IP multicasting and participates in the Internet Group Management Protocol.
SetIPConnectionMetric

Sets the routing metric associated with this IP-bound adapter.

Windows 2000 with SP2 and earlier:  This method is not available.
SetIPUseZeroBroadcast

Sets IP zero broadcast usage.
SetIPXFrameTypeNetworkPairs

The Internetwork Packet Exchange (IPX) technology is no longer available for use as of Windows Vista, and this method is obsolete.

Windows Server 2003, Windows XP, and Windows 2000:  Sets IPX network number or frame pairs for this network adapter.
SetIPXVirtualNetworkNumber

The Internetwork Packet Exchange (IPX) technology is no longer available for use as of Windows Vista, and this method is obsolete.

Windows Server 2003, Windows XP, and Windows 2000:  Sets the Internetwork Packet Exchange (IPX) virtual network number on the target computer system.
SetKeepAliveInterval

Sets the interval separating Keep Alive Retransmissions until a response is received.
SetKeepAliveTime

Sets how often TCP attempts to verify that an idle connection is still available by sending a Keep Alive packet.
SetMTU

Sets the default Maximum Transmission Unit (MTU) for a network interface.

This method is not supported.
SetNumForwardPackets

Sets the number of IP packet headers allocated for the router packet queue.
SetPMTUBHDetect

Enables detection of Black Hole routers.
SetPMTUDiscovery

Enables Maximum Transmission Unit (MTU) discovery.
SetTcpipNetbios

Sets the default operation of NetBIOS over TCP/IP.

Windows 2000:  This property is not available.
SetTcpMaxConnectRetransmissions

Sets the number of attempts TCP will retransmit a connect request before aborting.
SetTcpMaxDataRetransmissions

Sets the number of times TCP will retransmit an individual data segment before aborting the connection.
SetTcpNumConnections

Sets the maximum number of connections that TCP may have open simultaneously.
SetTcpUseRFC1122UrgentPointer

Specifies whether TCP uses the RFC 1122 specification for urgent data, or the mode used by Berkeley Software Design (BSD) derived systems.
SetTcpWindowSize

Sets the maximum TCP Receive Window size offered by the system.
SetWINSServer

Sets the primary and secondary Windows Internet Naming Service (WINS) servers on this TCP/IP-bound network adapter.

 以上引自MSDN：http://msdn.microsoft.com/en-us/library/aa394217.aspx

 C#代码示例：

 1 using System.Management; // System.Management 
 2 using System.Collections; // System.Collections 
 3 
 4 namespace Win32_NetworkAdapterConfiguration
 5 {
 6 public partial class Form1 : Form
 7 {
 8 ArrayList AryLst = new ArrayList(); // ArrayList 
 9 ManagementObject objCls; // ManagementObject 
10 string strCls = "Win32_NetworkAdapterConfiguration"; // WMI 命名空间 ( Namespace )
11 string strNS = "root\\CIMV2"; // WMI 类 (Class)
12 string strIndex; // 用来记录网卡界面 Index
13 Public Form1()
14 {
15 InitializeComponent();
16 }
17 private void Form1_Load(object sender, EventArgs e)
18 {
19 GetAdtInfo(); // 获取网卡信息
20 }
21 private void GetAdtInfo()
22 {
23 // 指定查询网卡信息 ( IPEnabled 为 True 的 )
24 string strQry = "Select * from Win32_NetworkAdapterConfiguration where IPEnabled=True";
25 // ManagementObjectSearcher 类 ,根据指定的查询获取物理控件的集合。
26 ManagementObjectSearcher objSc = new ManagementObjectSearcher(strQry);
27 // 用foreach获取元素
28 foreach (ManagementObject objQry in objSc.Get())
29 {
30 AryLst.Add(objQry["Index"]); 
31 ComboBox.Items.Add(objQry["Description"]); 
32 }
33 }
34 //
35 private void button1_Click(object sender, EventArgs e)
36 {
37 string strIP = "192.168.1.3"; // IP地址
38 string strSubmask = "255.255.255.0"; // 子网掩码
39 string strGateway = "192.168.1.1"; // 网关
40 string strDNS1 = "168.95.1.1"; // 首选DNS 
41 string strDNS2 = "168.95.192.1"; // 备用DNS
42 // 调用SetNetCfg()方法设定网卡信息
43 SetNetCfg(strIP, strSubmask, strGateway, strDNS1, strDNS2);
44 }
45 public void SetNetCfg(string strIP, string strSubmask, string strGateway, string strDNS1, string strDNS2)
46 {
47 // 建立 ManagementObject 物件 ( Scope , Path , options )
48 objCls = new ManagementObject(strNS, strCls + ".INDEX=" + strIndex, null);
49 ManagementBaseObject objInPara; // 
50 objInPara = objCls.GetMethodParameters("EnableStatic");
51 objInPara["IPAddress"] = new string[] { strIP }; // 设置IP
52 objInPara["SubnetMask"] = new string[] { strSubmask }; // 设置子网掩码
53 objCls.InvokeMethod("EnableStatic", objInPara, null);
54 objInPara = objCls.GetMethodParameters("SetGateways");
55 objInPara["DefaultIPGateway"] = new string[] { strGateway }; // 设置网关
56 objCls.InvokeMethod("SetGateways", objInPara, null);
57 objInPara = objCls.GetMethodParameters("SetDNSServerSearchOrder");
58 objInPara["DNSServerSearchOrder"] = new string[] { strDNS1, strDNS2 }; // 设置DNS
59 objCls.InvokeMethod("SetDNSServerSearchOrder", objInPara, null);
60 // GetMethodParameters 方法 : 用來取得 SetDNSServerSearchOrder 的参数列表。
61 // InvokeMethod 方法 : 调用。
62 }
63 // Button2 使用 DHCP自动获取 IP
64 private void button2_Click(object sender, EventArgs e)
65 {
66 SetAuto(); // 调用SetAuto方法
67 }
68 public void SetAuto()
69 {
70 // 建立 ManagementObject 对象 ( Scope , Path , options )
71 objCls = new ManagementObject(strNS, strCls + ".INDEX=" + strIndex, null)
72 // InvokeMethod 方法 : 在对象上调用方法。
73 objCls.InvokeMethod("EnableDHCP", null); // 设置自动获取 IP
74 objCls.InvokeMethod("ReleaseDHCPLease", null); // 释放 IP
75 objCls.InvokeMethod("RenewDHCPLease", null); // 重新取得 IP
76 }
77 private void ComboBox_SelectedIndexChanged(object sender, EventArgs e)
78 {
79 strIndex = (ComboBox.SelectedIndex + 1).ToString();
80 }
81 }
82 }

上面代码来自：http://www.cnblogs.com/sunnyliu357/archive/2012/03/06/2381400.html