c# barcode generator example Lesson 1: Understanding and Configuring Network Connections in Visual C#.NET

Printer Quick Response Code in Visual C#.NET Lesson 1: Understanding and Configuring Network Connections

Lesson 1: Understanding and Configuring Network Connections
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Figure 1-20 Manually assigning an IPv4 configuration for a network connection
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By default, network connections are configured to obtain an IP address and DNS server address automatically. To configure a static IP address, therefore, you need to select the Use The Following IP Address option and then specify an IP address, a subnet mask, and (optionally) a default gateway. To assign a static DNS server assignment to the connection, select the Use The Following DNS Server Addresses option, and then specify a preferred and (optionally) alternate DNS server address. Assigning an IPv6 Configuration Manually In most cases, you do not need to configure an IPv6 address manually because static IPv6 addresses are normally assigned only to routers and not to hosts. Typically, an IPv6 configuration is assigned to a host through autoconfiguration. However, you can set an IPv6 address manually by using the Internet Protocol Version 6 (TCP/ IPv6) Properties dialog box. To open this dialog box, in the properties of the network connection, double-click Internet Protocol Version 6 (TCP/IPv6). The Internet Protocol Version 6 (TCP/IPv6) dialog box is shown in Figure 1-21.
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Understanding and Configuring IP
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Figure 1-21 The Internet Protocol Version 6 (TCP/IPv6) dialog box
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As with IPv4, network connections are configured to obtain an IPv6 address automatically and to obtain a DNS server address automatically. To configure a static IPv6 address, select the Use The Following IPv6 Address option and specify an IPv6 address, subnet prefix length (typically 64), and (optionally) a default gateway. Note that if you configure a static IPv6 address, you must also specify a static IPv6 DNS server address. Configuring IPv4 and IPv6 Settings Manually from the Command Prompt You can use the Netsh utility to assign an IP configuration to a connection from the command prompt. To assign a static IPv4 address and subnet mask to a connection from the command propt, type the following, where Connection_Name is the name of the connection (such as Local Area Connection), Address is the IPv4 address, and Subnet_Mask is the subnet mask.
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netsh interface ip set address "Connection_Name" static Address Subnet_Mask
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For example, to set the IPv4 address of the Local Area Connection to 192.168.33.5 with a subnet mask of 255.255.255.0, you would type the following:
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netsh interface ip set address "local area connection" static 192.168.33.5 255.255.255.0
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If you also want to define a default gateway along with the IPv4 configuration, you can add that information to the end of the command. For example, to configure the same IPv4 address for the local area connection with a default gateway of 192.168.33.1, type the following:
Lesson 1: Understanding and Configuring Network Connections
netsh interface ip set address "local area connection" static 192.168.33.5 255.255.255.0 192.168.33.1
NOTE
Alternate Netsh syntax
There are many acceptable variations in Netsh syntax. For example, you can type netsh interface ipv4 instead of netsh interface ip. For more information, use Netsh Help.
To assign a static IPv6 address to a connection from the command prompt, type the following, where Connection_Name is the name of the connection and Address is the IPv6 address.
netsh interface ipv6 set address "Connection_Name" Address
For example, to assign an address of 2001:db8:290c:1291::1 to the Local Area Connection (leaving the default subnet prefix of 64), type the following:
netsh interface ipv6 set address "Local Area Connection" 2001:db8:290c:1291::1
The Netsh utility includes many other options for configuring both IPv4 and IPv6. Use Netsh Help for more information on the options and syntax.
Configuring an IPv4 Connection to Receive an Address Automatically
By default, all connections are configured to receive an IPv4 address automatically. When configured in this way, a computer owning this type of a connection is known as a DHCP client. As a result of this setting, all network connections will obtain an IPv4 address from a DHCP server if one is available. If no DHCP server is available, a connection will automatically assign itself any alternate configuration that you have defined for it. If you have defined no alternate configuration, the connection will automatically assign itself an Automatic Private IP Addressing (APIPA) address for IPv4. To configure a connection to obtain an IPv4 address automatically, select the appropriate option in the Internet Protocol Version 4 (TCP/IPv4) Properties dialog box, as shown in Figure 1-22.
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