Index: frontend/node_modules/default-gateway/ibmi.js
===================================================================
--- frontend/node_modules/default-gateway/ibmi.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/default-gateway/ibmi.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,36 @@
+"use strict";
+
+const execa = require("execa");
+
+const db2util = "/QOpenSys/pkgs/bin/db2util";
+const sql = "select NEXT_HOP, LOCAL_BINDING_INTERFACE from QSYS2.NETSTAT_ROUTE_INFO where ROUTE_TYPE='DFTROUTE' and NEXT_HOP!='*DIRECT' and CONNECTION_TYPE=?";
+
+const parse = stdout => {
+  let result;
+  try {
+    const resultObj = JSON.parse(stdout);
+    const gateway = resultObj.records[0].NEXT_HOP;
+    const iface = resultObj.records[0].LOCAL_BINDING_INTERFACE;
+    result = {gateway, iface};
+  } catch {}
+  if (!result) {
+    throw new Error("Unable to determine default gateway");
+  }
+  return result;
+};
+
+const promise = async family => {
+  const {stdout} = await execa(db2util, [sql, "-p", family, "-o", "json"]);
+  return parse(stdout);
+};
+
+const sync = family => {
+  const {stdout} = execa.sync(db2util, [sql, "-p", family, "-o", "json"]);
+  return parse(stdout);
+};
+
+module.exports.v4 = () => promise("IPV4");
+module.exports.v6 = () => promise("IPV6");
+
+module.exports.v4.sync = () => sync("IPV4");
+module.exports.v6.sync = () => sync("IPV6");