System.Net.Sockets.Socket.CheckCacheRemote C# (CSharp) Method

        private Internals.SocketAddress CheckCacheRemote(ref EndPoint remoteEP, bool isOverwrite)
        {
            IPEndPoint ipSnapshot = remoteEP as IPEndPoint;

            if (ipSnapshot != null)
            {
                // Snapshot to avoid external tampering and malicious derivations if IPEndPoint.
                ipSnapshot = ipSnapshot.Snapshot();

                // DualMode: Do the security check on the user input address, but return an IPEndPoint 
                // mapped to an IPv6 address.
                remoteEP = RemapIPEndPoint(ipSnapshot);
            }

            // This doesn't use SnapshotAndSerialize() because we need the ipSnapshot later.
            Internals.SocketAddress socketAddress = CallSerializeCheckDnsEndPoint(remoteEP);

            // We remember the first peer with which we have communicated.
            Internals.SocketAddress permittedRemoteAddress = _permittedRemoteAddress;
            if (permittedRemoteAddress != null && permittedRemoteAddress.Equals(socketAddress))
            {
                return permittedRemoteAddress;
            }

            // Cache only the first peer with which we communicated.
            if (_permittedRemoteAddress == null || isOverwrite)
            {
                _permittedRemoteAddress = socketAddress;
            }

            return socketAddress;
        }