Getting underlying IP used in database connection

Getting underlying IP used in database connection - c#

I'm trying to see how pooled database connections are affecting the load balancing of commands between a fleet of read only MySQL database replicas. The data source in the connection string is a DNS entry that has several entries which are served to the client in a round robin fashion.
Is it possible to take the database connection object and extract the IP address that the connection is using to connect?
Update
In this code example:
MySql.Data.MySqlClient.MySqlConnection _mySQL = new MySql.Data.MySqlClient.MySqlConnection(_AuroraClusterEndPoint);
Update #2
My question is more of how to determine what IP an active connection is using and not really how to evenly distribute traffic.
Pseudo Code:
MySql.Data.MySqlClient.MySqlConnection _mySQL = new MySql.Data.MySqlClient.MySqlConnection(_AuroraClusterEndPoint);
_mySQL.Open();
Console.WriteLine(_mySQL.ConnectionInfo.IPAddress); //This is the unknown part
_mySQL.Close();
How would I take _mySQL and extract the IP address it is using?

Yes and no,
Don't store the dns hostname in your connection string. Build the connection string on the fly, (anyway you can or want to store the information).
When building the connection string in code lookup the dns alias/host name to get it's ip addresses (should only return 1 ipv4 address)
IPAddress[] ipv4Addresses = Array.FindAll(
Dns.GetHostEntry("hostnamehere").AddressList,
a => a.AddressFamily == AddressFamily.InterNetwork);
Test it and debug if you get multiple addresses.
Once you get the IP you now know what IP address the round robin gave the request, you can log it, then build your connection string with the IP address instead of the host name.
Here's a rough and dirty example I wrote in 5 minutes:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApp3
{
class Program
{
static void Main(string[] args)
{
string ipAddress;
var newConnectionString = SwapConnectionStringDNSWithIP("Server=google.com;Database=myDataBase;Uid=myUsername;Pwd=myPassword;", out ipAddress);
Console.WriteLine(ipAddress);
Console.WriteLine(newConnectionString);
Console.ReadKey(true);
}
public static string SwapConnectionStringDNSWithIP(string connectionString, out string ipAddress)
{
ipAddress = null;
if (string.IsNullOrEmpty(connectionString))
return null;
var dict = new Dictionary<string, string>();
var pParts = connectionString.Split(';');
foreach (var part in pParts)
{
if (part.IndexOf('=') == -1)
break;
var sParts = part.Split('=');
if (sParts.Length != 2)
break;
string key = sParts[0].ToLower().Trim();
string value = sParts[1];
if (!dict.ContainsKey(key))
{
dict.Add(key, value);
}
}
var server = dict.ContainsKey("server") ? dict["server"] : null;
if (server == null)
return null;
var ret = Dns.GetHostEntry(server);
var addresses = ret.AddressList.Select(a => a.GetAddressBytes()).ToArray();
if (addresses != null && addresses.Length > 0)
{
ipAddress = string.Join(".", addresses[0]);
dict["server"] = ipAddress;
var newConnectionString = string.Join(string.Empty, dict.Keys.Select(k => k + "=" + dict[k] + ";").ToArray());
return newConnectionString;
}
return null;
}
}
}

Related

Is it possible pinging with C# like in the CMD?

I'm trying to get IP address of a dns server with the code:
var address = Dns.GetHostAddresses(domain)[0];
Its working on my pc, but when I'm doing it through someone else pc its giving him different result (IPv6 instead of IPv4).
I did try to use the method
var ipV4Address = address.MapToIPv4();
but that just returning the wrong IP address
p.s: btw, when using the command ping dns.address.blabla on both computers the result is the same.

If the domain have IPv4 and IPv6 addresses, you'll get both. Filter by AddressFamily to InterNetwork only (IPv4) instead of InterNetworkV6 (IPv6)
var ipV4Address = Dns.GetHostAddresses(domain)
.First(a => a.AddressFamily == AddressFamily.InterNetwork);

To answer your specific question in the header: Yes, it is. Here's an outline of how to do that:
using System.Net.NetworkInformation;
...
private static bool PingWithResponse(int timeout, string iP, out string response)
{
bool result = false;
using (var p = new Ping())
{
var r = p.Send(iP, timeout);
response = $"Ping to {iP} [{r.Address}]";
if (r.Status == IPStatus.Success)
{
response += $" Successful Response delay = {r.RoundtripTime} ms";
result = true;
}
else
{
response += $" Failed Status: {r.Status}";
}
}
return result;
}

How to Change Public IP Address in C#

I am creating a C# winform application, in which I want to change the Public IP Address, NOT the IPv4 Address like (Hotspot-Shield, ZenMate, OpenVPN, and others do).
I have checked the following links but didn't find enough help, so I am posting this question:
How can you change Network settings (IP Address, DNS, WINS, Host Name) with code in C#
Changing IP address in C#
I write the same code as in the answer of 1st link and also used the libraries but when I check my IP address through google.com it remains the same. I don't know the socket programming.
Here is my code:
namespace WindowsFormsApplication1
{
class ChangeIP
{
public void SetIP(string ipAddress, string subnetMask, string gateway)
{
using (var networkConfigMng = new ManagementClass("Win32_NetworkAdapterConfiguration"))
{
using (var networkConfigs = networkConfigMng.GetInstances())
{
foreach (var managementObject in networkConfigs.Cast<ManagementObject>().Where(managementObject => (bool)managementObject["IPEnabled"]))
{
using (var newIP = managementObject.GetMethodParameters("EnableStatic"))
{
// Set new IP address and subnet if needed
if ((!String.IsNullOrEmpty(ipAddress)) || (!String.IsNullOrEmpty(subnetMask)))
{
if (!String.IsNullOrEmpty(ipAddress))
{
newIP["IPAddress"] = new[] { ipAddress };
}
if (!String.IsNullOrEmpty(subnetMask))
{
newIP["SubnetMask"] = new[] { subnetMask };
}
managementObject.InvokeMethod("EnableStatic", newIP, null);
}
// Set mew gateway if needed
if (!String.IsNullOrEmpty(gateway))
{
using (var newGateway = managementObject.GetMethodParameters("SetGateways"))
{
newGateway["DefaultIPGateway"] = new[] { gateway };
newGateway["GatewayCostMetric"] = new[] { 1 };
managementObject.InvokeMethod("SetGateways", newGateway, null);
}
}
}
}
}
}
}
/// <summary>
/// Set's the DNS Server of the local machine
/// </summary>
/// <param name="nic">NIC address</param>
/// <param name="dnsServers">Comma seperated list of DNS server addresses</param>
/// <remarks>Requires a reference to the System.Management namespace</remarks>
public void SetNameservers(string nic, string dnsServers)
{
using (var networkConfigMng = new ManagementClass("Win32_NetworkAdapterConfiguration"))
{
using (var networkConfigs = networkConfigMng.GetInstances())
{
foreach (var managementObject in networkConfigs.Cast<ManagementObject>().Where(objMO => (bool)objMO["IPEnabled"] && objMO["Caption"].Equals(nic)))
{
using (var newDNS = managementObject.GetMethodParameters("SetDNSServerSearchOrder"))
{
newDNS["DNSServerSearchOrder"] = dnsServers.Split(',');
managementObject.InvokeMethod("SetDNSServerSearchOrder", newDNS, null);
}
}
}
}
}
}
}
And Here is how I am calling those methods:
{
static string local_ip;
string public_ip;
public static string GetLocalIPAddress() //Method For Getting Local Machine IP
{
var host = Dns.GetHostEntry(Dns.GetHostName());
foreach (var ip in host.AddressList)
{
if (ip.AddressFamily == AddressFamily.InterNetwork)
{
return ip.ToString();
}
}
throw new Exception("Local IP Address Not Found!");
}
// Mehod End
local_ip = GetLocalIPAddress();
ChangeIP ip = new ChangeIP();
ip.SetIP(local_ip, null, null); // Calling Method
var getNIC = NetworkInterface.GetAllNetworkInterfaces();
NetworkInterface[] NI = NetworkInterface.GetAllNetworkInterfaces();
string nic = string.Empty;
string dnsServer = string.Empty;
foreach(var r in getNIC)
{
nic = r.Name;
}
foreach(NetworkInterface ninter in NI)
{
if(ninter.OperationalStatus == OperationalStatus.Up)
{
IPInterfaceProperties ipProperties = ninter.GetIPProperties();
IPAddressCollection dnsAddresses = ipProperties.DnsAddresses;
foreach(IPAddress dnsAdrs in dnsAddresses)
{
dnsServer = dnsAdrs.ToString();
}
}
}
ip.SetNameservers(nic, dnsServer); // Calling Method
public_ip = new WebClient().DownloadString("http://icanhazip.com");
}

How you've described your question is not how the internet (is supposed to) work(s).
Windows doesn't let you write raw IP packets, for this you need to use a TAP/TUN driver. But although you send out packets spoofing the source IP address, the internet between you and the destination won't return the route.
If you're operating behind a block of IP addresses, and only want to spoof another in that block, the return address will get back to your local router, but still won't necessary route back to you.
Unless you use TAP/TUN, there's no other way to steal someone else's Public IP address, excluding other network security vulnerability exploitations which are beyond the scope of this forum.
And even with TAP/TUN you're very limited in what you can achieve over spoofed IP packets in one direction. In fact, ISPs may filter out spoofed IP addresses.

Converting IPAddress[] to string

I've got a server application which I'm trying to automatically set the IP address to, taken from the machine's dynamically allocated IP address. So far I've got this to get the IPv4 but it's returned as type IPAddress[] which I have some trouble converting to a string[] so my HttpListener can use it. Any hint to how I can convert it? Or am I going about this the wrong way?
This is what I'm using to get the IP address:
class Program
{
static void Main(string[] args)
{
string name = (args.Length < 1) ? Dns.GetHostName() : args[0];
try
{
IPAddress[] addrs = Array.FindAll(Dns.GetHostEntry(string.Empty).AddressList,
a => a.AddressFamily == AddressFamily.InterNetwork);
Console.WriteLine("Your IP address is: ");
foreach (IPAddress addr in addrs)
Console.WriteLine("{0} {1}", name, addr);
//Here I'm trying to convert the IPAddress[] into a string[] to use in my listener
string str = addrs.ToString();
string[] ipString = { str };
Response.Listener(ipString);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
//current way of setting the IP address - not optimal
string[] ipstring = new string[1] {"10.10.180.11:8080"};
Response.Listener(ipstring);
}
}
And the listener for good times sake:
public static void Listener(string[] prefixes)
{
if (!HttpListener.IsSupported)
{
Console.WriteLine("Windows XP SP2 or Server 2003 is required to use the HttpListener class.");
return;
}
// URI prefixes are required,
// for example "http://contoso.com:8080/index/".
if (prefixes == null || prefixes.Length == 0)
throw new ArgumentException("prefixes");
// Create a listener.
HttpListener listener = new HttpListener();
// Add the prefixes.
foreach (string s in prefixes)
{
listener.Prefixes.Add("http://" + s + "/");
}
listener.Start();

This should do the trick.
string[] ips = addresses.Select(ip => ip.ToString()).ToArray();
Make sure you have a using statement for System.Linq

You are trying to convert an IPAdress's array like one IPAdress.
You can use LINQ to convert each IPAdress, then you can make the String's array :
String[] strAddrs = (from cad in addrs select cad.ToString()).ToArray();
Don't forget : using System.Linq;

If you have an IPAddress object, you can get the string representation like this:
v4:
validIP4.MapToIPv4().ToString();
v6:
validIP4.MapToIPv6().ToString();

How to obtain Public IP of a device using C# with out using external API/Services

public static string GetPublicIp()
{
HttpContext context = HttpContext.Current;
string ipAddress = context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
if (!string.IsNullOrEmpty(ipAddress))
{
string[] addresses = ipAddress.Split(',');
if (addresses.Length != 0)
{
return addresses[0];
}
}
return context.Request.ServerVariables["REMOTE_ADDR"];
}
I'm trying to get the client Public IP but the above code only returns the client Local IP. If different people are connecting to my organisation from the same organisations network, i want to get only their public IP address. I'm not intrested in their local IPs, is this possible.
Below is one solution i have so far seen but i'm NOT liking it.
public static string GetPublicIp()
{
string direction = "";
WebRequest request = WebRequest.Create("http://checkip.dyndns.org");
using (WebResponse response1 = request.GetResponse())
using (StreamReader stream1 = new StreamReader(response1.GetResponseStream()))
{
direction = stream1.ReadToEnd();
}
//Search for the ip in the html
int first1 = direction.IndexOf("Address: ") + 9;
int last1 = direction.LastIndexOf("</body>");
direction = direction.Substring(first1, last1 - first1);
return direction;
}
The above sample solution can get me the public IP but i don't want to be tied to an external service that i have no control over because if that service is down then iam screwed and the performance is terrible.
Does any one know how i can get the clients public IP with out calling external services?

This method gives you the local ip address. I've copied it from a WinRT-Solution, maybe the class names are a bit different in other .NET environments.
private static string GetLocalAddress()
{
var hostnames = NetworkInformation.GetHostNames();
foreach (var hn in hostnames)
{
//IanaInterfaceType == 71 => Wifi
//IanaInterfaceType == 6 => Ethernet (Emulator)
if (hn.IPInformation != null &&
(hn.IPInformation.NetworkAdapter.IanaInterfaceType == 71
|| hn.IPInformation.NetworkAdapter.IanaInterfaceType == 6))
{
return hn.DisplayName;
}
}
return IpAddress.Broadcast.Address;
}
EDIT: The following method prints out all local ip addresses.
private static void PrintLocalAddresses()
{
var interfaces = NetworkInterface.GetAllNetworkInterfaces();
foreach (var ni in interfaces)
{
if (ni.NetworkInterfaceType == NetworkInterfaceType.Ethernet ||
ni.NetworkInterfaceType == NetworkInterfaceType.Wireless80211)
{
var adapterProperties = ni.GetIPProperties();
foreach (var x in adapterProperties.UnicastAddresses)
{
if (x.Address.AddressFamily == AddressFamily.InterNetwork)
{
Console.WriteLine(x.Address);
}
}
}
}
}

Reliable method to get machine's MAC address in C#

I need a way to get a machine's MAC address, regardless of the OS it is running, by using C#.
The application will need to work on XP/Vista/Win7 32bit and 64bit, as well as on those OSs but with a foreign language default. Also, many of the C# commands and OS queries don't work across all the OSs.
Do you have any ideas?
I have been scraping the output of ipconfig /all but this is terribly unreliable as the output format differs on every machine.

Cleaner solution
var macAddr =
(
from nic in NetworkInterface.GetAllNetworkInterfaces()
where nic.OperationalStatus == OperationalStatus.Up
select nic.GetPhysicalAddress().ToString()
).FirstOrDefault();
Or:
String firstMacAddress = NetworkInterface
.GetAllNetworkInterfaces()
.Where( nic => nic.OperationalStatus == OperationalStatus.Up && nic.NetworkInterfaceType != NetworkInterfaceType.Loopback )
.Select( nic => nic.GetPhysicalAddress().ToString() )
.FirstOrDefault();

Here's some C# code which returns the MAC address of the first operational network interface. Assuming the NetworkInterface assembly is implemented in the runtime (i.e. Mono) used on other operating systems then this would work on other operating systems.
New version: returns the NIC with the fastest speed that also has a valid MAC address.
/// <summary>
/// Finds the MAC address of the NIC with maximum speed.
/// </summary>
/// <returns>The MAC address.</returns>
private string GetMacAddress()
{
const int MIN_MAC_ADDR_LENGTH = 12;
string macAddress = string.Empty;
long maxSpeed = -1;
foreach (NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces())
{
log.Debug(
"Found MAC Address: " + nic.GetPhysicalAddress() +
" Type: " + nic.NetworkInterfaceType);
string tempMac = nic.GetPhysicalAddress().ToString();
if (nic.Speed > maxSpeed &&
!string.IsNullOrEmpty(tempMac) &&
tempMac.Length >= MIN_MAC_ADDR_LENGTH)
{
log.Debug("New Max Speed = " + nic.Speed + ", MAC: " + tempMac);
maxSpeed = nic.Speed;
macAddress = tempMac;
}
}
return macAddress;
}
Original Version: just returns the first one.
/// <summary>
/// Finds the MAC address of the first operation NIC found.
/// </summary>
/// <returns>The MAC address.</returns>
private string GetMacAddress()
{
string macAddresses = string.Empty;
foreach (NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces())
{
if (nic.OperationalStatus == OperationalStatus.Up)
{
macAddresses += nic.GetPhysicalAddress().ToString();
break;
}
}
return macAddresses;
}
The only thing I don't like about this approach is if you have like a Nortel Packet Miniport or some type of VPN connection it has the potential of being chosen. As far as I can tell, there is no way to distinguish an actual physical device's MAC from some type of virtual network interface.

IMHO returning first mac address isn't good idea, especially when virtual machines are hosted. Therefore i check send/received bytes sum and select most used connection, that is not perfect, but should be correct 9/10 times.
public string GetDefaultMacAddress()
{
Dictionary<string, long> macAddresses = new Dictionary<string, long>();
foreach (NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces())
{
if (nic.OperationalStatus == OperationalStatus.Up)
macAddresses[nic.GetPhysicalAddress().ToString()] = nic.GetIPStatistics().BytesSent + nic.GetIPStatistics().BytesReceived;
}
long maxValue = 0;
string mac = "";
foreach(KeyValuePair<string, long> pair in macAddresses)
{
if (pair.Value > maxValue)
{
mac = pair.Key;
maxValue = pair.Value;
}
}
return mac;
}

The MACAddress property of the Win32_NetworkAdapterConfiguration WMI class can provide you with an adapter's MAC address. (System.Management Namespace)
MACAddress
Data type: string
Access type: Read-only
Media Access Control (MAC) address of the network adapter. A MAC address is assigned by the manufacturer to uniquely identify the network adapter.
Example: "00:80:C7:8F:6C:96"
If you're not familiar with the WMI API (Windows Management Instrumentation), there's a good overview here for .NET apps.
WMI is available across all version of windows with the .Net runtime.
Here's a code example:
System.Management.ManagementClass mc = default(System.Management.ManagementClass);
ManagementObject mo = default(ManagementObject);
mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
ManagementObjectCollection moc = mc.GetInstances();
foreach (var mo in moc) {
if (mo.Item("IPEnabled") == true) {
Adapter.Items.Add("MAC " + mo.Item("MacAddress").ToString());
}
}

WMI is the best solution if the machine you are connecting to is a windows machine, but if you are looking at a linux, mac, or other type of network adapter, then you will need to use something else. Here are some options:
Use the DOS command nbtstat -a . Create a process, call this command, parse the output.
First Ping the IP to make sure your NIC caches the command in it's ARP table, then use the DOS command arp -a . Parse the output of the process like in option 1.
Use a dreaded unmanaged call to sendarp in the iphlpapi.dll
Heres a sample of item #3. This seems to be the best option if WMI isn't a viable solution:
using System.Runtime.InteropServices;
...
[DllImport("iphlpapi.dll", ExactSpelling = true)]
public static extern int SendARP(int DestIP, int SrcIP, byte[] pMacAddr, ref uint PhyAddrLen);
...
private string GetMacUsingARP(string IPAddr)
{
IPAddress IP = IPAddress.Parse(IPAddr);
byte[] macAddr = new byte[6];
uint macAddrLen = (uint)macAddr.Length;
if (SendARP((int)IP.Address, 0, macAddr, ref macAddrLen) != 0)
throw new Exception("ARP command failed");
string[] str = new string[(int)macAddrLen];
for (int i = 0; i < macAddrLen; i++)
str[i] = macAddr[i].ToString("x2");
return string.Join(":", str);
}
To give credit where it is due, this is the basis for that code:
http://www.pinvoke.net/default.aspx/iphlpapi.sendarp#

We use WMI to get the mac address of the interface with the lowest metric, e.g. the interface windows will prefer to use, like this:
public static string GetMACAddress()
{
ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT * FROM Win32_NetworkAdapterConfiguration where IPEnabled=true");
IEnumerable<ManagementObject> objects = searcher.Get().Cast<ManagementObject>();
string mac = (from o in objects orderby o["IPConnectionMetric"] select o["MACAddress"].ToString()).FirstOrDefault();
return mac;
}
Or in Silverlight (needs elevated trust):
public static string GetMACAddress()
{
string mac = null;
if ((Application.Current.IsRunningOutOfBrowser) && (Application.Current.HasElevatedPermissions) && (AutomationFactory.IsAvailable))
{
dynamic sWbemLocator = AutomationFactory.CreateObject("WbemScripting.SWBemLocator");
dynamic sWbemServices = sWbemLocator.ConnectServer(".");
sWbemServices.Security_.ImpersonationLevel = 3; //impersonate
string query = "SELECT * FROM Win32_NetworkAdapterConfiguration where IPEnabled=true";
dynamic results = sWbemServices.ExecQuery(query);
int mtu = int.MaxValue;
foreach (dynamic result in results)
{
if (result.IPConnectionMetric < mtu)
{
mtu = result.IPConnectionMetric;
mac = result.MACAddress;
}
}
}
return mac;
}

This method will determine the MAC address of the Network Interface used to connect to the specified url and port.
All the answers here are not capable of achieving this goal.
I wrote this answer years ago (in 2014). So I decided to give it a little "face lift". Please look at the updates section
/// <summary>
/// Get the MAC of the Netowrk Interface used to connect to the specified url.
/// </summary>
/// <param name="allowedURL">URL to connect to.</param>
/// <param name="port">The port to use. Default is 80.</param>
/// <returns></returns>
private static PhysicalAddress GetCurrentMAC(string allowedURL, int port = 80)
{
//create tcp client
var client = new TcpClient();
//start connection
client.Client.Connect(new IPEndPoint(Dns.GetHostAddresses(allowedURL)[0], port));
//wai while connection is established
while(!client.Connected)
{
Thread.Sleep(500);
}
//get the ip address from the connected endpoint
var ipAddress = ((IPEndPoint)client.Client.LocalEndPoint).Address;
//if the ip is ipv4 mapped to ipv6 then convert to ipv4
if(ipAddress.IsIPv4MappedToIPv6)
ipAddress = ipAddress.MapToIPv4();
Debug.WriteLine(ipAddress);
//disconnect the client and free the socket
client.Client.Disconnect(false);
//this will dispose the client and close the connection if needed
client.Close();
var allNetworkInterfaces = NetworkInterface.GetAllNetworkInterfaces();
//return early if no network interfaces found
if(!(allNetworkInterfaces?.Length > 0))
return null;
foreach(var networkInterface in allNetworkInterfaces)
{
//get the unicast address of the network interface
var unicastAddresses = networkInterface.GetIPProperties().UnicastAddresses;
//skip if no unicast address found
if(!(unicastAddresses?.Count > 0))
continue;
//compare the unicast addresses to see
//if any match the ip address used to connect over the network
for(var i = 0; i < unicastAddresses.Count; i++)
{
var unicastAddress = unicastAddresses[i];
//this is unlikely but if it is null just skip
if(unicastAddress.Address == null)
continue;
var ipAddressToCompare = unicastAddress.Address;
Debug.WriteLine(ipAddressToCompare);
//if the ip is ipv4 mapped to ipv6 then convert to ipv4
if(ipAddressToCompare.IsIPv4MappedToIPv6)
ipAddressToCompare = ipAddressToCompare.MapToIPv4();
Debug.WriteLine(ipAddressToCompare);
//skip if the ip does not match
if(!ipAddressToCompare.Equals(ipAddress))
continue;
//return the mac address if the ip matches
return networkInterface.GetPhysicalAddress();
}
}
//not found so return null
return null;
}
To call it you need to pass a URL to connect to like this:
var mac = GetCurrentMAC("www.google.com");
You can also specify a port number. If not specified default is 80.
UPDATES:
2020
Added comments to explain the code.
Corrected to be used with newer
operating systems that use IPV4 mapped to IPV6 ( like windows 10 ).
Reduced nesting.
Upgraded the code use "var".

public static PhysicalAddress GetMacAddress()
{
var myInterfaceAddress = NetworkInterface.GetAllNetworkInterfaces()
.Where(n => n.OperationalStatus == OperationalStatus.Up && n.NetworkInterfaceType != NetworkInterfaceType.Loopback)
.OrderByDescending(n => n.NetworkInterfaceType == NetworkInterfaceType.Ethernet)
.Select(n => n.GetPhysicalAddress())
.FirstOrDefault();
return myInterfaceAddress;
}

You could go for the NIC ID:
foreach (NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces()) {
if (nic.OperationalStatus == OperationalStatus.Up){
if (nic.Id == "yay!")
}
}
It's not the MAC address, but it is a unique identifier, if that's what you're looking for.

I really like AVee's solution with the lowest IP connection metric! But if a second nic with the same metric is installed, the MAC comparison could fail...
Better you store the description of the interface with the MAC. In later comparisons you can identify the right nic by this string. Here is a sample code:
public static string GetMacAndDescription()
{
ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT * FROM Win32_NetworkAdapterConfiguration where IPEnabled=true");
IEnumerable<ManagementObject> objects = searcher.Get().Cast<ManagementObject>();
string mac = (from o in objects orderby o["IPConnectionMetric"] select o["MACAddress"].ToString()).FirstOrDefault();
string description = (from o in objects orderby o["IPConnectionMetric"] select o["Description"].ToString()).FirstOrDefault();
return mac + ";" + description;
}
public static string GetMacByDescription( string description)
{
ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT * FROM Win32_NetworkAdapterConfiguration where IPEnabled=true");
IEnumerable<ManagementObject> objects = searcher.Get().Cast<ManagementObject>();
string mac = (from o in objects where o["Description"].ToString() == description select o["MACAddress"].ToString()).FirstOrDefault();
return mac;
}

let's say I have a TcpConnection using my local ip of 192.168.0.182. Then if I will like to know the mac address of that NIC I will call the meothod as: GetMacAddressUsedByIp("192.168.0.182")
public static string GetMacAddressUsedByIp(string ipAddress)
{
var ips = new List<string>();
string output;
try
{
// Start the child process.
Process p = new Process();
// Redirect the output stream of the child process.
p.StartInfo.UseShellExecute = false;
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.UseShellExecute = false;
p.StartInfo.CreateNoWindow = true;
p.StartInfo.FileName = "ipconfig";
p.StartInfo.Arguments = "/all";
p.Start();
// Do not wait for the child process to exit before
// reading to the end of its redirected stream.
// p.WaitForExit();
// Read the output stream first and then wait.
output = p.StandardOutput.ReadToEnd();
p.WaitForExit();
}
catch
{
return null;
}
// pattern to get all connections
var pattern = #"(?xis)
(?<Header>
(\r|\n) [^\r]+ : \r\n\r\n
)
(?<content>
.+? (?= ( (\r\n\r\n)|($)) )
)";
List<Match> matches = new List<Match>();
foreach (Match m in Regex.Matches(output, pattern))
matches.Add(m);
var connection = matches.Select(m => new
{
containsIp = m.Value.Contains(ipAddress),
containsPhysicalAddress = Regex.Match(m.Value, #"(?ix)Physical \s Address").Success,
content = m.Value
}).Where(x => x.containsIp && x.containsPhysicalAddress)
.Select(m => Regex.Match(m.content, #"(?ix) Physical \s address [^:]+ : \s* (?<Mac>[^\s]+)").Groups["Mac"].Value).FirstOrDefault();
return connection;
}

Really hate to dig up this old post but I feel the question deserves another answer specific to windows 8-10.
Using NetworkInformation from the Windows.Networking.Connectivity namespace, you can get the Id of the network adapter windows is using. Then you can get the interface MAC Address from the previously mentioned GetAllNetworkInterfaces().
This will not work in Windows Store Apps as NetworkInterface in System.Net.NetworkInformation does not expose GetAllNetworkInterfaces.
string GetMacAddress()
{
var connectionProfile = NetworkInformation.GetInternetConnectionProfile();
if (connectionProfile == null) return "";
var inUseId = connectionProfile.NetworkAdapter.NetworkAdapterId.ToString("B").ToUpperInvariant();
if(string.IsNullOrWhiteSpace(inUseId)) return "";
var mac = NetworkInterface.GetAllNetworkInterfaces()
.Where(n => inUseId == n.Id)
.Select(n => n.GetPhysicalAddress().GetAddressBytes().Select(b=>b.ToString("X2")))
.Select(macBytes => string.Join(" ", macBytes))
.FirstOrDefault();
return mac;
}

string mac = "";
foreach (NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces())
{
if (nic.OperationalStatus == OperationalStatus.Up && (!nic.Description.Contains("Virtual") && !nic.Description.Contains("Pseudo")))
{
if (nic.GetPhysicalAddress().ToString() != "")
{
mac = nic.GetPhysicalAddress().ToString();
}
}
}
MessageBox.Show(mac);

Changed blak3r his code a bit. In case you have two adapters with the same speed. Sort by MAC, so you always get the same value.
public string GetMacAddress()
{
const int MIN_MAC_ADDR_LENGTH = 12;
string macAddress = string.Empty;
Dictionary<string, long> macPlusSpeed = new Dictionary<string, long>();
try
{
foreach(NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces())
{
System.Diagnostics.Debug.WriteLine("Found MAC Address: " + nic.GetPhysicalAddress() + " Type: " + nic.NetworkInterfaceType);
string tempMac = nic.GetPhysicalAddress().ToString();
if(!string.IsNullOrEmpty(tempMac) && tempMac.Length >= MIN_MAC_ADDR_LENGTH)
macPlusSpeed.Add(tempMac, nic.Speed);
}
macAddress = macPlusSpeed.OrderByDescending(row => row.Value).ThenBy(row => row.Key).FirstOrDefault().Key;
}
catch{}
System.Diagnostics.Debug.WriteLine("Fastest MAC address: " + macAddress);
return macAddress;
}

foreach (NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces())
{
if (nic.OperationalStatus == OperationalStatus.Up)
{
PhysicalAddress Mac = nic.GetPhysicalAddress();
}
}

ipconfig.exe is implemented using various DLLs including iphlpapi.dll ... Googling for iphlpapi reveals a corresponding Win32 API documented in MSDN.

Try this:
/// <summary>
/// returns the first MAC address from where is executed
/// </summary>
/// <param name="flagUpOnly">if sets returns only the nic on Up status</param>
/// <returns></returns>
public static string[] getOperationalMacAddresses(Boolean flagUpOnly)
{
string[] macAddresses = new string[NetworkInterface.GetAllNetworkInterfaces().Count()];
int i = 0;
foreach (NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces())
{
if (nic.OperationalStatus == OperationalStatus.Up || !flagUpOnly)
{
macAddresses[i] += ByteToHex(nic.GetPhysicalAddress().GetAddressBytes());
//break;
i++;
}
}
return macAddresses;
}

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