shared: add independent IPv4 and IPv6 collection [CI]

backend/shared/MoShiro.Measurement/Net/Tcp.cs

@@ -39,7 +39,7 @@ public sealed class TcpLink : IDisposable
     /// </summary>
     public static async Task<TcpLink> OpenAsync(BlockEnv env, int port, bool tls, uint streamId, bool sendAuth, CancellationToken ct)
     {
-        var client = new TcpClient { NoDelay = true };
+        var client = new TcpClient(env.PeerAddress!.AddressFamily) { NoDelay = true };
         try
         {
             long start = env.Clock.NowUs();
@@ -153,6 +153,11 @@ public sealed class TcpAcceptor
         foreach (int port in _ports)
         {
             var listener = new TcpListener(_bind, port);
+            if (_bind.Equals(IPAddress.IPv6Any))
+            {
+                listener.Server.DualMode = true;
+            }
+
             listener.Start(128);
             _listeners.Add(listener);
             bound.Add(((IPEndPoint)listener.LocalEndpoint).Port);