diff --git a/debug.html b/debug.html
index 7aac6d96..5749da57 100644
--- a/debug.html
+++ b/debug.html
@@ -147,6 +147,10 @@
                 </td>
             </tr>
 
+            <tr>
+                <td colspan="2"><hr></td>
+            </tr>
+
             <tr>
                 <td><label for="relay_url">Networking proxy (leave blank to disable)</label></td>
                 <td>
@@ -154,6 +158,24 @@
                 </td>
             </tr>
 
+            <tr>
+                <td><label for="net_device_type">Network Device Type</label></td>
+                <td>
+                    <select id="net_device_type">
+                        <option value="ne2k">ne2k</option>
+                        <option value="virtio">virtio</option>
+                    </select>
+                 </td>
+            </tr>
+
+            <tr>
+                <td><label for="mtu">Network MTU (only used for virtio)</label></td>
+                <td>
+                    <input id="mtu" type="number" value="1500" min="68" max="65535" step="1"> B<br>
+                 </td>
+            </tr>
+
+
             <tr>
                 <td colspan="2"><hr></td>
             </tr>
diff --git a/index.html b/index.html
index 37bfe324..9b2bbfc7 100644
--- a/index.html
+++ b/index.html
@@ -247,6 +247,10 @@
                 </td>
             </tr>
 
+            <tr>
+                <td colspan="2"><hr></td>
+            </tr>
+
             <tr>
                 <td><label for="relay_url">Networking proxy</label><br>
                     Presets: <a id="network_none">none</a>, <a id="network_inbrowser">inbrowser</a>, <a id="network_relay">public relay</a>, <a id="network_wisp">wisp</a>, <a id="network_fetch">fetch</a></td>
@@ -255,6 +259,23 @@
                 </td>
             </tr>
 
+            <tr>
+                <td><label for="net_device_type">Network Device Type</label></td>
+                <td>
+                    <select id="net_device_type">
+                        <option value="ne2k">ne2k</option>
+                        <option value="virtio">virtio</option>
+                    </select>
+                 </td>
+            </tr>
+
+            <tr>
+                <td><label for="mtu">Network MTU (only used for virtio)</label></td>
+                <td>
+                    <input id="mtu" type="number" value="1500" min="68" max="65535" step="1"> B<br>
+                 </td>
+            </tr>
+
             <tr>
                 <td colspan="2"><hr></td>
             </tr>
diff --git a/src/browser/main.js b/src/browser/main.js
index cacc704f..65101c24 100644
--- a/src/browser/main.js
+++ b/src/browser/main.js
@@ -12,6 +12,8 @@ const DEFAULT_NETWORKING_PROXIES = ["wss://relay.widgetry.org/", "ws://localhost
 const DEFAULT_MEMORY_SIZE = 128;
 const DEFAULT_VGA_MEMORY_SIZE = 8;
 const DEFAULT_BOOT_ORDER = 0;
+const DEFAULT_MTU = 1500;
+const DEFAULT_NIC_TYPE = "ne2k";
 
 const MAX_ARRAY_BUFFER_SIZE_MB = 2000;
 
@@ -1689,6 +1691,8 @@ function onload()
     if(query_args.has("mute")) $("disable_audio").checked = bool_arg(query_args.get("mute"));
     if(query_args.has("acpi")) $("acpi").checked = bool_arg(query_args.get("acpi"));
     if(query_args.has("boot_order")) $("boot_order").value = query_args.get("boot_order");
+    if(query_args.has("net_device_type")) $("net_device_type").value = query_args.get("net_device_type");
+    if(query_args.has("mtu")) $("mtu").value = query_args.get("mtu");
 
     for(const dev of ["fda", "fdb"])
     {
@@ -2091,12 +2095,12 @@ function start_emulation(profile, query_args)
             settings.acpi = query_args.has("acpi") ? bool_arg(query_args.get("acpi")) : settings.acpi;
             settings.use_bochs_bios = query_args.get("bios") === "bochs";
             settings.net_device_type = query_args.get("net_device_type") || settings.net_device_type;
+            settings.mtu = parseInt(query_args.get("mtu"), 10) || undefined;
         }
 
         settings.relay_url = query_args.get("relay_url");
         settings.disable_jit = bool_arg(query_args.get("disable_jit"));
         settings.disable_audio = bool_arg(query_args.get("mute"));
-        settings.mtu = parseInt(query_args.get("mtu"), 10) || undefined;
     }
 
     if(!settings.relay_url)
@@ -2240,6 +2244,21 @@ function start_emulation(profile, query_args)
             settings.bios = { url: BIOSPATH + "bochs-bios.bin" };
             settings.vga_bios = { url: BIOSPATH + "bochs-vgabios.bin" };
         }
+
+        const nic_type = $("net_device_type").value || DEFAULT_NIC_TYPE;
+        if(!settings.net_device_type || nic_type !== DEFAULT_NIC_TYPE)
+        {
+            settings.net_device_type = nic_type;
+        }
+        if(settings.net_device_type !== DEFAULT_NIC_TYPE) new_query_args.set("net_device_type", settings.net_device_type);
+
+        const mtu = parseInt($("mtu").value, 10) || DEFAULT_MTU;
+        if(!settings.mtu || mtu !== DEFAULT_MTU)
+        {
+            settings.mtu = mtu;
+        }
+        if(settings.mtu !== DEFAULT_MTU) new_query_args.set("mtu", settings.mtu.toString());
+
     }
 
     if(!query_args)
@@ -2254,7 +2273,7 @@ function start_emulation(profile, query_args)
             use_graphical_text: false,
         },
         net_device: {
-            type: settings.net_device_type || "ne2k",
+            type: settings.net_device_type || DEFAULT_NIC_TYPE,
             relay_url: settings.relay_url,
             cors_proxy: settings.cors_proxy,
             mtu: settings.mtu
diff --git a/src/virtio_net.js b/src/virtio_net.js
index ee7ad94c..f73cc281 100644
--- a/src/virtio_net.js
+++ b/src/virtio_net.js
@@ -9,6 +9,8 @@ import * as marshall from "../lib/marshall.js";
 import { CPU } from "./cpu.js";
 import { BusConnector } from "./bus.js";
 
+const DEFAULT_MTU = 1500;
+
 const VIRTIO_NET_F_MAC = 5;
 const VIRTIO_NET_F_CTRL_VQ = 17;
 const VIRTIO_NET_F_STATUS = 16;
@@ -24,9 +26,9 @@ const VIRTIO_NET_CTRL_MAC_ADDR_SET = 1;
  * @param {CPU} cpu
  * @param {BusConnector} bus
  * @param {Boolean} preserve_mac_from_state_image
- * @param {Number} mtu
+ * @param {number} mtu
  */
-export function VirtioNet(cpu, bus, preserve_mac_from_state_image, mtu = 1500)
+export function VirtioNet(cpu, bus, preserve_mac_from_state_image, mtu = DEFAULT_MTU)
 {
     /** @const @type {BusConnector} */
     this.bus = bus;