diff --git a/src/com/captainalm/lib/calmnet/marshal/CandidateClient.java b/src/com/captainalm/lib/calmnet/marshal/CandidateClient.java
new file mode 100644
index 0000000..e57860a
--- /dev/null
+++ b/src/com/captainalm/lib/calmnet/marshal/CandidateClient.java
@@ -0,0 +1,34 @@
+package com.captainalm.lib.calmnet.marshal;
+
+import java.net.InetAddress;
+
+/**
+ * This class provides a candidate client for {@link NetMarshalServer}s.
+ *
+ * @author Captain ALM
+ */
+public final class CandidateClient {
+    /**
+     * The remote address of the candidate.
+     */
+    public final InetAddress address;
+    /**
+     * The remote port of the candidate.
+     */
+    public final int port;
+    /**
+     * Whether the candidate should be accepted.
+     */
+    public boolean accept = true;
+
+    /**
+     * Constructs a new instance of CandidateClient with an address and port.
+     *
+     * @param address The remote address of the candidate.
+     * @param port The remote port of the candidate.
+     */
+    public CandidateClient(InetAddress address, int port) {
+        this.address = address;
+        this.port = port;
+    }
+}
diff --git a/src/com/captainalm/lib/calmnet/marshal/NetMarshalServer.java b/src/com/captainalm/lib/calmnet/marshal/NetMarshalServer.java
new file mode 100644
index 0000000..1c561a0
--- /dev/null
+++ b/src/com/captainalm/lib/calmnet/marshal/NetMarshalServer.java
@@ -0,0 +1,269 @@
+package com.captainalm.lib.calmnet.marshal;
+
+import com.captainalm.lib.calmnet.packet.IPacket;
+import com.captainalm.lib.calmnet.packet.PacketException;
+import com.captainalm.lib.calmnet.packet.PacketLoader;
+import com.captainalm.lib.calmnet.packet.factory.IPacketFactory;
+import com.captainalm.lib.calmnet.stream.NetworkInputStream;
+
+import java.io.Closeable;
+import java.io.IOException;
+import java.io.PipedOutputStream;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.function.BiConsumer;
+import java.util.function.Consumer;
+
+/**
+ * This class provides a way of networking on the server side and holds a collection of {@link NetMarshalClient}s.
+ * NOTE: Methods that are synchronised are used here, do NOT use instances of these classes as monitors.
+ *
+ * @author Captain ALM
+ */
+public class NetMarshalServer implements Closeable {
+    protected boolean running;
+
+    protected ServerSocket socket;
+    protected DatagramSocket dsocket;
+    protected final NetworkInputStream dInputStream;
+    protected final Map<NetMarshalClient, PipedOutputStream> outputs;
+    protected final List<NetMarshalClient> clients = new ArrayList<>();
+
+    protected BiConsumer<IPacket, NetMarshalClient> receiveBiConsumer;
+    protected BiConsumer<Exception, NetMarshalClient> receiveExceptionBiConsumer;
+    protected BiConsumer<Exception, NetMarshalServer> acceptExceptionBiConsumer;
+    protected Consumer<NetMarshalClient> closedConsumer;
+    protected BiConsumer<CandidateClient, NetMarshalServer> acceptanceBiConsumer;
+    protected BiConsumer<Socket, NetMarshalServer> socketSetupBiConsumer;
+    protected BiConsumer<DatagramSocket, NetMarshalServer> dSocketSetupBiConsumer;
+
+    protected final Thread acceptThread;
+
+    protected final InetAddress localAddress;
+    protected final int localPort;
+    protected final IPacketFactory factory;
+    protected final PacketLoader loader;
+    protected final FragmentationOptions fragmentationOptions;
+
+    private NetMarshalServer(InetAddress localAddress, int localPort, IPacketFactory factory, PacketLoader loader, boolean isSocketNull, FragmentationOptions fragmentationOptions, DatagramSocket dsock) {
+        if (isSocketNull) throw new NullPointerException("socketIn is null");
+        if (localAddress == null) throw new NullPointerException("localAddress is null");
+        this.localAddress = localAddress;
+        if (localPort < 0) throw new IllegalArgumentException("localPort is less than 0");
+        if (localPort > 65535) throw new IllegalArgumentException("localPort is greater than 65535");
+        this.localPort = localPort;
+        if (factory == null) throw new NullPointerException("factory is null");
+        this.factory = factory;
+        if (loader == null) throw new NullPointerException("loader is null");
+        this.loader = loader;
+        this.fragmentationOptions = fragmentationOptions;
+        if (fragmentationOptions != null) fragmentationOptions.validate();
+        if (dsock == null) {
+            dInputStream = null;
+            outputs = null;
+            acceptThread = new Thread(() -> {
+                while (running) acceptThreadExecutedSocket();
+            }, "thread_accept_" + localAddress.getHostAddress() + ":" + localPort);
+        } else {
+            dInputStream = new NetworkInputStream(dsock);
+            outputs = new HashMap<>();
+            acceptThread = new Thread(() -> {
+                while (running) acceptThreadExecutedDSocket();
+            }, "thread_accept_" + localAddress.getHostAddress() + ":" + localPort);
+        }
+    }
+
+    /**
+     * Constructs a new NetMarshalServer with the specified {@link ServerSocket}, {@link IPacketFactory}, {@link PacketLoader} and {@link FragmentationOptions}.
+     *
+     * @param socketIn The server socket to use.
+     * @param factory The packet factory to use.
+     * @param loader The packet loader to use.
+     * @param fragmentationOptions The fragmentation options, null to disable fragmentation.
+     * @throws NullPointerException socketIn, factory or loader is null.
+     * @throws IllegalArgumentException Fragmentation options failed validation.
+     */
+    public NetMarshalServer(ServerSocket socketIn, IPacketFactory factory, PacketLoader loader, FragmentationOptions fragmentationOptions) {
+        this((socketIn == null) ? null : socketIn.getInetAddress(), (socketIn == null) ? -1 : socketIn.getLocalPort(), factory, loader, socketIn == null, fragmentationOptions, null);
+        socket = socketIn;
+    }
+
+    /**
+     * Constructs a new NetMarshalServer with the specified {@link DatagramSocket}, {@link IPacketFactory}, {@link PacketLoader} and {@link FragmentationOptions}.
+     *
+     * @param socketIn The datagram socket to use.
+     * @param factory The packet factory to use.
+     * @param loader The packet loader to use.
+     * @param fragmentationOptions The fragmentation options, null to disable fragmentation.
+     * @throws NullPointerException socketIn, factory or loader is null.
+     * @throws IllegalArgumentException Fragmentation options failed validation.
+     */
+    public NetMarshalServer(DatagramSocket socketIn, IPacketFactory factory, PacketLoader loader, FragmentationOptions fragmentationOptions) {
+        this((socketIn == null) ? null : socketIn.getInetAddress(), (socketIn == null) ? -1 : socketIn.getLocalPort(), factory, loader, socketIn == null, fragmentationOptions, socketIn);
+        dsocket = socketIn;
+    }
+
+    /**
+     * Opens the marshal.
+     */
+    public synchronized final void open() {
+        if (running) return;
+        running = true;
+        acceptThread.start();
+    }
+
+    /**
+     * Gets the packet factory in use.
+     *
+     * @return The packet factory.
+     */
+    public IPacketFactory getPacketFactory() {
+        return factory;
+    }
+
+    /**
+     * Gets the packet loader in use.
+     *
+     * @return The packet loader.
+     */
+    public PacketLoader getPacketLoader() {
+        return loader;
+    }
+
+    /**
+     * Get the local {@link InetAddress}.
+     *
+     * @return The local address or null.
+     */
+    public InetAddress localAddress() {
+        return localAddress;
+    }
+
+    /**
+     * Get the local port.
+     *
+     * @return The local port or -1.
+     */
+    public int localPort() {
+        return localPort;
+    }
+
+    /**
+     * Gets if the marshal is running.
+     *
+     * @return If the marshal is running.
+     */
+    public synchronized final boolean isRunning() {
+        return running;
+    }
+
+    /**
+     * Gets the {@link FragmentationOptions} of the client.
+     *
+     * @return The fragmentation options or null if fragmentation is disabled.
+     */
+    public FragmentationOptions getFragmentationOptions() {
+        return fragmentationOptions;
+    }
+
+    /**
+     * Gets the current set of connected {@link NetMarshalClient}s.
+     *
+     * @return An array of connected clients.
+     */
+    public synchronized final NetMarshalClient[] getConnectedClients() {
+        synchronized ((socket == null) ? dsocket : socket) {
+            return clients.toArray(new NetMarshalClient[0]);
+        }
+    }
+
+    /**
+     * Broadcasts a {@link IPacket}.
+     *
+     * @param packetIn The packet to broadcast.
+     * @param directSend Whether the packet should be sent directly or through the fragmentation system.
+     * @throws IOException A stream exception has occurred.
+     * @throws PacketException An exception has occurred.
+     * @throws NullPointerException packetIn is null.
+     */
+    public synchronized final void broadcastPacket(IPacket packetIn, boolean directSend) throws IOException, PacketException {
+        if (packetIn == null) throw new NullPointerException("packetIn is null");
+        synchronized ((socket == null) ? dsocket : socket) {
+            for (NetMarshalClient c : clients)
+                if (c.isRunning()) c.sendPacket(packetIn, directSend);
+        }
+    }
+
+    /**
+     * Flushes all the output streams on all the clients.
+     *
+     * @throws IOException A stream exception has occurred.
+     */
+    public synchronized final void flush() throws IOException {
+        synchronized ((socket == null) ? dsocket : socket) {
+            for (NetMarshalClient c : clients)
+                if (c.isRunning()) c.flush();
+        }
+    }
+
+    /**
+     * Disconnects all the clients (By closing them).
+     *
+     * @throws IOException An I/O Exception has occurred.
+     */
+    public synchronized final void disconnectAll() throws IOException {
+        disconnectAllInternal();
+    }
+
+    private void disconnectAllInternal() throws IOException {
+        synchronized ((socket == null) ? dsocket : socket) {
+            for (NetMarshalClient c : clients)
+                if (c.isRunning()) c.close();
+        }
+    }
+
+    /**
+     * Connects to a remote endpoint.
+     *
+     * @param remoteAddress The remote address to connect to.
+     * @param remotePort The remote port to connect to.
+     * @return A NetMarshalClient instance or null for non-accepted connection.
+     * @throws IOException A connection error has occurred.
+     */
+    public synchronized final NetMarshalClient connect(InetAddress remoteAddress, int remotePort) throws IOException {
+        return null;
+    }
+
+    /**
+     * Closes the marshal, closing all the connected clients.
+     *
+     * @throws IOException An I/O Exception has occurred.
+     */
+    @Override
+    public synchronized final void close() throws IOException {
+        if (running) {
+            running = false;
+            if (Thread.currentThread() != acceptThread) acceptThread.interrupt();
+            try {
+                if (socket != null) socket.close();
+                if (dInputStream != null) dInputStream.close();
+            } finally {
+                disconnectAllInternal();
+            }
+        }
+    }
+
+    protected void acceptThreadExecutedSocket() {
+
+    }
+
+    protected void acceptThreadExecutedDSocket() {
+
+    }
+}