public static bool IsOnLAN(IPAddress address)
{
if (IsLocalAddress(address))
{
return true;
}
var info = NetworkInterface.GetAllNetworkInterfaces()
.Where(x => x.OperationalStatus == OperationalStatus.Up && x.NetworkInterfaceType != NetworkInterfaceType.Loopback)
.SelectMany(x => x.GetIPProperties().UnicastAddresses)
.Where(x => x.Address.AddressFamily == AddressFamily.InterNetwork)
.Where(x => x.IPv4Mask != null)
.First();
return address.IsInSameSubnet(info.Address, info.IPv4Mask);
}
public static bool IsOnLAN(IPAddress address)
{
if (IsLocalAddress(address))
return true;
var systemAddresses = NetworkInterface.GetAllNetworkInterfaces()
.Where(x => x.OperationalStatus == OperationalStatus.Up && x.NetworkInterfaceType != NetworkInterfaceType.Loopback)
.SelectMany(x => x.GetIPProperties().UnicastAddresses);
if (address.AddressFamily == AddressFamily.InterNetwork)
{
return systemAddresses
.Where(x => x.Address.AddressFamily == AddressFamily.InterNetwork)
.Where(x => x.IPv4Mask != null)
.Any(x => address.IsInSameSubnet(x.Address, x.IPv4Mask.GetAddressBytes()));
}
else
{
// TODO: Get the IPv6 subnet mask from the .NET framework
byte[] subnetMask = new byte[16] { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
return systemAddresses
.Where(x => x.Address.AddressFamily == AddressFamily.InterNetworkV6)
.Any(x => address.IsInSameSubnet(x.Address, subnetMask));
}
}