PrefixOrigin Перечисление

  • Ссылка

Определение

Пространство имен:
System.Net.NetworkInformation
Сборка:
System.Net.NetworkInformation.dll
Сборка:
System.dll
Сборка:
netstandard.dll

Указывает, каким образом был задан префикс сети IP-адреса.

public enum class PrefixOrigin
public enum PrefixOrigin
type PrefixOrigin = 
Public Enum PrefixOrigin
Наследование
Object
ValueType
Enum
PrefixOrigin

Поля

Dhcp 3

Префикс был назначен DHCP-сервером.
Manual 1

Префикс был настроен вручную.
Other 0

Префикс был задан с помощью неопределенного источника.
RouterAdvertisement 4

Префикс был назначен с помощью объявления маршрутизатора.
WellKnown 2

Префикс является общеизвестным. Общеизвестные префиксы указаны в стандартных документах RFC и назначены Администрацией адресного пространства Интернет (Iana) или в реестре адресов. Эти префиксы зарезервированы для особых целей.

Примеры

В следующем примере кода отображаются сведения о префиксе и суффиксе для адресов одноадресной рассылки.

void DisplayUnicastAddresses()
{
   Console::WriteLine( "Unicast Addresses" );
   array<NetworkInterface^>^adapters = NetworkInterface::GetAllNetworkInterfaces();
   System::Collections::IEnumerator^ myEnum17 = adapters->GetEnumerator();
   while ( myEnum17->MoveNext() )
   {
      NetworkInterface ^ adapter = safe_cast<NetworkInterface ^>(myEnum17->Current);
      IPInterfaceProperties ^ adapterProperties = adapter->GetIPProperties();
      UnicastIPAddressInformationCollection ^ uniCast = adapterProperties->UnicastAddresses;
      if ( uniCast->Count > 0 )
      {
         Console::WriteLine( adapter->Description );
         String^ lifeTimeFormat = "dddd, MMMM dd, yyyy  hh:mm:ss tt";
         System::Collections::IEnumerator^ myEnum18 = uniCast->GetEnumerator();
         while ( myEnum18->MoveNext() )
         {
            UnicastIPAddressInformation ^ uni = safe_cast<UnicastIPAddressInformation ^>(myEnum18->Current);
            DateTime when;
            Console::WriteLine( "  Unicast Address ......................... : {0}", 
               uni->Address );
            Console::WriteLine( "     Prefix Origin ........................ : {0}", 
               uni->PrefixOrigin );
            Console::WriteLine( "     Suffix Origin ........................ : {0}", 
               uni->SuffixOrigin );
            Console::WriteLine( "     Duplicate Address Detection .......... : {0}", 
               uni->DuplicateAddressDetectionState );
            
            // Format the lifetimes as Sunday, February 16, 2003 11:33:44 PM
            // if en-us is the current culture.
            // Calculate the date and time at the end of the lifetimes.    
            when = DateTime::UtcNow + TimeSpan::FromSeconds( (double)uni->AddressValidLifetime );
            when = when.ToLocalTime();
            Console::WriteLine( "     Valid Life Time ...................... : {0}", 
               when.ToString( lifeTimeFormat, System::Globalization::CultureInfo::CurrentCulture ) );
            when = DateTime::UtcNow + TimeSpan::FromSeconds( (double)uni->AddressPreferredLifetime );
            when = when.ToLocalTime();
            Console::WriteLine( "     Preferred life time .................. : {0}", 
               when.ToString( lifeTimeFormat, System::Globalization::CultureInfo::CurrentCulture ) );
            when = DateTime::UtcNow + TimeSpan::FromSeconds( (double)uni->DhcpLeaseLifetime );
            when = when.ToLocalTime();
            Console::WriteLine( "     DHCP Leased Life Time ................ : {0}", 
               when.ToString( lifeTimeFormat, System::Globalization::CultureInfo::CurrentCulture ) );
         }
         Console::WriteLine();
      }
   }
}

public static void DisplayUnicastAddresses()
{
    Console.WriteLine("Unicast Addresses");
    NetworkInterface[] adapters  = NetworkInterface.GetAllNetworkInterfaces();
    foreach (NetworkInterface adapter in adapters)
    {
        IPInterfaceProperties adapterProperties = adapter.GetIPProperties();
        UnicastIPAddressInformationCollection uniCast = adapterProperties.UnicastAddresses;
        if (uniCast.Count >0)
        {
            Console.WriteLine(adapter.Description);
            string lifeTimeFormat = "dddd, MMMM dd, yyyy  hh:mm:ss tt";
            foreach (UnicastIPAddressInformation uni in uniCast)
            {
                DateTime when;

                Console.WriteLine("  Unicast Address ......................... : {0}", uni.Address);
                Console.WriteLine("     Prefix Origin ........................ : {0}", uni.PrefixOrigin);
                Console.WriteLine("     Suffix Origin ........................ : {0}", uni.SuffixOrigin);
                Console.WriteLine("     Duplicate Address Detection .......... : {0}",
                    uni.DuplicateAddressDetectionState);

                // Format the lifetimes as Sunday, February 16, 2003 11:33:44 PM
                // if en-us is the current culture.

                // Calculate the date and time at the end of the lifetimes.
                when = DateTime.UtcNow + TimeSpan.FromSeconds(uni.AddressValidLifetime);
                when = when.ToLocalTime();
                Console.WriteLine("     Valid Life Time ...................... : {0}",
                    when.ToString(lifeTimeFormat,System.Globalization.CultureInfo.CurrentCulture)
                );
                when = DateTime.UtcNow + TimeSpan.FromSeconds(uni.AddressPreferredLifetime);
                when = when.ToLocalTime();
                Console.WriteLine("     Preferred life time .................. : {0}",
                    when.ToString(lifeTimeFormat,System.Globalization.CultureInfo.CurrentCulture)
                );

                when = DateTime.UtcNow + TimeSpan.FromSeconds(uni.DhcpLeaseLifetime);
                when = when.ToLocalTime();
                Console.WriteLine("     DHCP Leased Life Time ................ : {0}",
                    when.ToString(lifeTimeFormat,System.Globalization.CultureInfo.CurrentCulture)
                );
            }
            Console.WriteLine();
        }
    }
}

Public Shared Sub DisplayUnicastAddresses() 

    Console.WriteLine("Unicast Addresses")
    Dim adapters As NetworkInterface() = NetworkInterface.GetAllNetworkInterfaces()
    Dim adapter As NetworkInterface
    For Each adapter In  adapters
        Dim adapterProperties As IPInterfaceProperties = adapter.GetIPProperties()
        Dim uniCast As UnicastIPAddressInformationCollection = adapterProperties.UnicastAddresses
        If uniCast.Count > 0 Then
            Console.WriteLine(adapter.Description)
            Dim lifeTimeFormat As String = "dddd, MMMM dd, yyyy  hh:mm:ss tt"
            Dim uni As UnicastIPAddressInformation
            For Each uni In  uniCast
                Dim [when] As DateTime
                
                Console.WriteLine("  Unicast Address ......................... : {0}", uni.Address)
                Console.WriteLine("     Prefix Origin ........................ : {0}", uni.PrefixOrigin)
                Console.WriteLine("     Suffix Origin ........................ : {0}", uni.SuffixOrigin)
                Console.WriteLine("     Duplicate Address Detection .......... : {0}", uni.DuplicateAddressDetectionState)
                
                ' Format the lifetimes as Sunday, February 16, 2003 11:33:44 PM
                ' if en-us is the current culture.
                ' Calculate the date and time at the end of the lifetimes.    
                [when] = DateTime.UtcNow + TimeSpan.FromSeconds(uni.AddressValidLifetime)
                [when] = [when].ToLocalTime()
                Console.WriteLine("     Valid Life Time ...................... : {0}", [when].ToString(lifeTimeFormat, System.Globalization.CultureInfo.CurrentCulture))
                [when] = DateTime.UtcNow + TimeSpan.FromSeconds(uni.AddressPreferredLifetime)
                [when] = [when].ToLocalTime()
                Console.WriteLine("     Preferred life time .................. : {0}", [when].ToString(lifeTimeFormat, System.Globalization.CultureInfo.CurrentCulture))
                
                [when] = DateTime.UtcNow + TimeSpan.FromSeconds(uni.DhcpLeaseLifetime)
                [when] = [when].ToLocalTime()
                Console.WriteLine("     DHCP Leased Life Time ................ : {0}", [when].ToString(lifeTimeFormat, System.Globalization.CultureInfo.CurrentCulture))
            Next uni
            Console.WriteLine()
        End If
    Next adapter

End Sub

Комментарии

IP-адреса делятся на две части: префикс и суффикс. Префикс адреса определяет сетевую часть IP-адреса, а суффикс адреса определяет часть узла. Префиксы назначаются глобальными центрами, а суффиксы — локальными системными администраторами.

Это перечисление используется классами UnicastIPAddressInformation и MulticastIPAddressInformation . Экземпляры этого класса возвращаются при получении сведений об адресе NetworkInterface для объекта .

Применяется к