I have a need to figure out which adapter is used when a connection is created. In other words, if I have multiple NIC cards (i.e. wireless, lan, etc) on my machine, which card is being used for the connection?
If anyone can point me in the right direction...
In C#
foreach(var nic in NetworkInterface.GetAllNetworkInterfaces.Where(n => n.OperationalStatus == OperationStatus.UP)
{
if(nic.GetIsNetworkAvailable())
{
//nic is attached to some form of network
}
}
VB .NET
ForEach nic in NetworkInterface.GetAllNetworkInterfaces.Where(Function(n) n.OperationalStatus = OperationStatus.UP)
If nic.GetIsNetworkAvailable() Then
//nic is attached to some form of network
End If
Next
This will only test active working Network Interfaces that are connected to an active network.
Why don't you use the MAC address?
Maybe you could map it by the MAC Address:
var nics = NetworkInterface.GetAllNetworkInterfaces();
foreach (var nic in nics)
{
if (nic.OperationalStatus == OperationalStatus.Up)
{
var mac = nic.GetPhysicalAddress().ToString();
if (mac == "your:connections:mac:address")
{
/* ... */
}
}
}
The "your:connections:mac:address" part you can figure out following this method, using the IP address of the LocalEndPoint.
How do I obtain the physical (MAC) address of an IP address using C#?
It's not beautiful, but it could work.
Related
I'm coding a part where the software need to obtain MAC Address of the current PC and found this solution which works for offline too:
https://stackoverflow.com/a/15784105/9641721
I obtained the same MAC Address using method 1 but somehow get different Addresses during offline vs online when using method 2, anyone can explain to me why? FYI my laptop only has one network card.
Method 2:
public static string GetMACAddress2()
{
NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces();
String sMacAddress = string.Empty;
foreach (NetworkInterface adapter in nics)
{
if (sMacAddress == String.Empty)// only return MAC Address from first card
{
sMacAddress = adapter.GetPhysicalAddress().ToString();
}
}
return sMacAddress;
}
My result:
Online:
Method1: C85B76FD53xx
Method2: 6A00E3D94Exx
Offline:
Method1: C85B76FD53xx
Method2: C85B76FD53xx
Thanks.
There are a lot of questions about getting the name and IP addresses of the local machine and several about getting IP addresses of other machines on the LAN (not all answered correctly). This is different.
In windows explorer if I select Network on the side bar I get a view of local machines on my LAN listed by machine name (in a windows workgroup, anyway). How do I get that same information programatically in C#?
You can try using the System.DirectoryServices namespace.
var root = new DirectoryEntry("WinNT:");
foreach (var dom in root.Children) {
foreach (var entry in dom.Children) {
if (entry.Name != "Schema") {
Console.WriteLine(entry.Name);
}
}
}
You need to broadcast an ARP request for all IPs within a given range. Start by defining the base IP on your network and then setting an upper identifier.
I was going to write up some code examples etc but it looks like someone has covered this comprehensively here;
Stackoverflow ARP question
This seems to be what you are after: How get list of local network computers?
In C#: you can use Gong Solutions
Shell Library
(https://sourceforge.net/projects/gong-shell/)
public List<String> ListNetworkComputers()
{
List<String> _ComputerNames = new List<String>();
String _ComputerSchema = "Computer";
System.DirectoryServices.DirectoryEntry _WinNTDirectoryEntries = new System.DirectoryServices.DirectoryEntry("WinNT:");
foreach (System.DirectoryServices.DirectoryEntry _AvailDomains in _WinNTDirectoryEntries.Children)
{
foreach (System.DirectoryServices.DirectoryEntry _PCNameEntry in _AvailDomains.Children)
{
if (_PCNameEntry.SchemaClassName.ToLower().Contains(_ComputerSchema.ToLower()))
{
_ComputerNames.Add(_PCNameEntry.Name);
}
}
}
return _ComputerNames;
}
I have a WCF service.
How can i know if the call to my service comes from local machine or a machine from network?
Thanks,
Adrya
You could check the IP of the caller. If it is from the local machine should be "127.0.0.1".
You can get the IP of the caller (the remote address) from the OperationContext object.
More info here:
http://www.danrigsby.com/blog/index.php/2008/05/21/get-the-clients-address-in-wcf/
I'd compile a list at startup of ALL the known IP addresses on the local machine using something like....
NetworkInterface[] nis = NetworkInterface.GetAllNetworkInterfaces();
List<string> addressList = new List<string>();
foreach (NetworkInterface ni in nis)
{
IPInterfaceProperties iip = ni.GetIPProperties();
UnicastIPAddressInformationCollection unis = iip.UnicastAddresses;
foreach (UnicastIPAddressInformation uni in unis)
{
string address = uni.Address.ToString();
addressList.Add(address);
}
}
and then check the addressList to see if it contains the 'remote' IP address.
That should cover any request presenting itself from the local machine with an IP addy other than 127.0.0.1.
Is there any way i can retrieve MAC Address when Network Adapter is disabled in .net?
Thanks in advance,
It is not possible to get the MAC address of an adapter which is disabled: this is because getting the MAC address requires querying the driver, and the driver for a disabled adapter is not loaded (source).
You can, however get the MAC address of an adapter which is not currently connected.
The WMI route is no good here, because it shows the MAC address as null for adapters which are not connected. The good news is that the NetworkInterface.GetAllNetworkInterfaces() route works just fine:
// using System.Net.NetworkInformation;
var nics = NetworkInterface.GetAllNetworkInterfaces();
// pick your NIC!
var selectedNic = nics.First();
var macAddress = selectedNic.GetPhysicalAddress().ToString();
Refer this link.
http://msdn.microsoft.com/en-us/library/system.net.networkinformation.physicaladdress.aspx
The example here displays physical address of all interface irrespective of their operational stage. HTH.
You can use WMI:
public static string GetMACAddress()
{
ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
ManagementObjectCollection moc = mc.GetInstances();
string MACAddress=String.Empty;
foreach(ManagementObject mo in moc)
{
if(MACAddress==String.Empty) // only return MAC Address from first card
{
MACAddress= mo["MacAddress"].ToString() ;
}
mo.Dispose();
}
return MACAddress;
}
Using MS PowerShell command get-NetAdapter one can get the disabled network adapter's MAC Address.
More info at get-NetAdapter
I need to get the actual local network IP address of the computer (e.g. 192.168.0.220) from my program using C# and .NET 3.5. I can't just use 127.0.0.1 in this case.
How can I accomplish this?
If you are looking for the sort of information that the command line utility, ipconfig, can provide, you should probably be using the System.Net.NetworkInformation namespace.
This sample code will enumerate all of the network interfaces and dump the addresses known for each adapter.
using System;
using System.Net;
using System.Net.NetworkInformation;
class Program
{
static void Main(string[] args)
{
foreach ( NetworkInterface netif in NetworkInterface.GetAllNetworkInterfaces() )
{
Console.WriteLine("Network Interface: {0}", netif.Name);
IPInterfaceProperties properties = netif.GetIPProperties();
foreach ( IPAddress dns in properties.DnsAddresses )
Console.WriteLine("\tDNS: {0}", dns);
foreach ( IPAddressInformation anycast in properties.AnycastAddresses )
Console.WriteLine("\tAnyCast: {0}", anycast.Address);
foreach ( IPAddressInformation multicast in properties.MulticastAddresses )
Console.WriteLine("\tMultiCast: {0}", multicast.Address);
foreach ( IPAddressInformation unicast in properties.UnicastAddresses )
Console.WriteLine("\tUniCast: {0}", unicast.Address);
}
}
}
You are probably most interested in the UnicastAddresses.
Using Dns requires that your computer be registered with the local DNS server, which is not necessarily true if you're on a intranet, and even less likely if you're at home with an ISP. It also requires a network roundtrip -- all to find out info about your own computer.
The proper way:
NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces();
foreach(NetworkInterface adapter in nics)
{
foreach(var x in adapter.GetIPProperties().UnicastAddresses)
{
if (x.Address.AddressFamily == AddressFamily.InterNetwork && x.IsDnsEligible)
{
Console.WriteLine(" IPAddress ........ : {0:x}", x.Address.ToString());
}
}
}
(UPDATE 31-Jul-2015: Fixed some problems with the code)
Or for those who like just a line of Linq:
NetworkInterface.GetAllNetworkInterfaces()
.SelectMany(adapter=> adapter.GetIPProperties().UnicastAddresses)
.Where(adr=>adr.Address.AddressFamily == AddressFamily.InterNetwork && adr.IsDnsEligible)
.Select (adr => adr.Address.ToString());
In How to get IP addresses in .NET with a host name by John Spano, it says to add the System.Net namespace, and use the following code:
//To get the local IP address
string sHostName = Dns.GetHostName ();
IPHostEntry ipE = Dns.GetHostByName (sHostName);
IPAddress [] IpA = ipE.AddressList;
for (int i = 0; i < IpA.Length; i++)
{
Console.WriteLine ("IP Address {0}: {1} ", i, IpA[i].ToString ());
}
As a machine can have multiple ip addresses, the correct way to figure out your ip address that you're going to be using to route to the general internet is to open a socket to a host on the internet, then inspect the socket connection to see what the local address that is being used in that connection is.
By inspecting the socket connection, you will be able to take into account weird routing tables, multiple ip addresses and whacky hostnames. The trick with the hostname above can work, but I wouldn't consider it entirely reliable.
If you know there are one or more IPv4 addresses for your computer, this will provide one of them:
Dns.GetHostAddresses(Dns.GetHostName())
.First(a => a.AddressFamily == AddressFamily.InterNetwork).ToString()
GetHostAddresses normally blocks the calling thread while it queries the DNS server, and throws a SocketException if the query fails. I don't know whether it skips the network call when looking up your own host name.