Index: frontend/node_modules/default-gateway/win32.js
===================================================================
--- frontend/node_modules/default-gateway/win32.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/default-gateway/win32.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,99 @@
+"use strict";
+
+const {isIP} = require("net");
+const {networkInterfaces} = require("os");
+const execa = require("execa");
+
+const gwArgs = "path Win32_NetworkAdapterConfiguration where IPEnabled=true get DefaultIPGateway,GatewayCostMetric,IPConnectionMetric,Index /format:table".split(" ");
+const ifArgs = index => `path Win32_NetworkAdapter where Index=${index} get NetConnectionID,MACAddress /format:table`.split(" ");
+
+const spawnOpts = {
+  windowsHide: true,
+};
+
+// Parsing tables like this. The final metric is GatewayCostMetric + IPConnectionMetric
+//
+// DefaultIPGateway             GatewayCostMetric  Index  IPConnectionMetric
+// {"1.2.3.4", "2001:db8::1"}   {0, 256}           12     25
+// {"2.3.4.5"}                  {25}               12     55
+function parseGwTable(gwTable, family) {
+  let [bestGw, bestMetric, bestId] = [null, null, null];
+
+  for (let line of (gwTable || "").trim().split(/\r?\n/).splice(1)) {
+    line = line.trim();
+    const [_, gwArr, gwCostsArr, id, ipMetric] = /({.+?}) +?({.+?}) +?([0-9]+) +?([0-9]+)/g.exec(line) || [];
+    if (!gwArr) continue;
+
+    const gateways = (gwArr.match(/"(.+?)"/g) || []).map(match => match.substring(1, match.length - 1));
+    const gatewayCosts = (gwCostsArr.match(/[0-9]+/g) || []);
+
+    for (const [index, gateway] of Object.entries(gateways)) {
+      if (!gateway || `v${isIP(gateway)}` !== family) continue;
+
+      const metric = parseInt(gatewayCosts[index]) + parseInt(ipMetric);
+      if (!bestGw || metric < bestMetric) {
+        [bestGw, bestMetric, bestId] = [gateway, metric, id];
+      }
+    }
+  }
+
+  if (bestGw) return [bestGw, bestId];
+}
+
+function parseIfTable(ifTable) {
+  const line = (ifTable || "").trim().split("\n")[1];
+
+  let [mac, name] = line.trim().split(/\s+/);
+  mac = mac.toLowerCase();
+
+  // try to get the interface name by matching the mac to os.networkInterfaces to avoid wmic's encoding issues
+  // https://github.com/silverwind/default-gateway/issues/14
+  for (const [osname, addrs] of Object.entries(networkInterfaces())) {
+    for (const addr of addrs) {
+      if (addr && addr.mac && addr.mac.toLowerCase() === mac) {
+        return osname;
+      }
+    }
+  }
+  return name;
+}
+
+const promise = async family => {
+  const {stdout} = await execa("wmic", gwArgs, spawnOpts);
+  const [gateway, id] = parseGwTable(stdout, family) || [];
+
+  if (!gateway) {
+    throw new Error("Unable to determine default gateway");
+  }
+
+  let name;
+  if (id) {
+    const {stdout} = await execa("wmic", ifArgs(id), spawnOpts);
+    name = parseIfTable(stdout);
+  }
+
+  return {gateway, interface: name ? name : null};
+};
+
+const sync = family => {
+  const {stdout} = execa.sync("wmic", gwArgs, spawnOpts);
+  const [gateway, id] = parseGwTable(stdout, family) || [];
+
+  if (!gateway) {
+    throw new Error("Unable to determine default gateway");
+  }
+
+  let name;
+  if (id) {
+    const {stdout} = execa.sync("wmic", ifArgs(id), spawnOpts);
+    name = parseIfTable(stdout);
+  }
+
+  return {gateway, interface: name ? name : null};
+};
+
+module.exports.v4 = () => promise("v4");
+module.exports.v6 = () => promise("v6");
+
+module.exports.v4.sync = () => sync("v4");
+module.exports.v6.sync = () => sync("v6");