PrefixOrigin Enumeration
Specifies how an IP address network prefix was located.
Assembly: System (in System.dll)
| Member name | Description | |
|---|---|---|
| Other | The prefix was located using an unspecified source. | |
| Manual | The prefix was manually configured. | |
| WellKnown | The prefix is a well-known prefix. Well-known prefixes are specified in standard-track Request for Comments (RFC) documents and assigned by the Internet Assigned Numbers Authority (Iana) or an address registry. Such prefixes are reserved for special purposes. | |
| Dhcp | The prefix was supplied by a Dynamic Host Configuration Protocol (DHCP) server. | |
| RouterAdvertisement | The prefix was supplied by a router advertisement. |
IP addresses are divided into two parts: the prefix and the suffix. The address prefix identifies the network portion of an IP address, and the address suffix identifies the host portion. Prefixes are assigned by global authorities, and suffixes are assigned by local system administrators.
This enumeration is used by the UnicastIPAddressInformation and MulticastIPAddressInformation classes. Instances of this class are returned when you retrieve the address information for a NetworkInterface object.
The following code example displays prefix and suffix information for unicast addresses.
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(); } } }
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.