diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -579,6 +579,7 @@
 	interfaces/chain.cpp
 	interfaces/node.cpp
 	invrequest.cpp
+	mapport.cpp
 	miner.cpp
 	minerfund.cpp
 	net.cpp
diff --git a/src/init.cpp b/src/init.cpp
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -34,6 +34,7 @@
 #include <interfaces/chain.h>
 #include <interfaces/node.h>
 #include <key.h>
+#include <mapport.h>
 #include <miner.h>
 #include <net.h>
 #include <net_permissions.h>
diff --git a/src/interfaces/node.cpp b/src/interfaces/node.cpp
--- a/src/interfaces/node.cpp
+++ b/src/interfaces/node.cpp
@@ -13,6 +13,7 @@
 #include <interfaces/chain.h>
 #include <interfaces/handler.h>
 #include <interfaces/wallet.h>
+#include <mapport.h>
 #include <net.h>
 #include <net_processing.h>
 #include <netaddress.h>
diff --git a/src/mapport.h b/src/mapport.h
new file mode 100644
--- /dev/null
+++ b/src/mapport.h
@@ -0,0 +1,19 @@
+// Copyright (c) 2011-2020 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_MAPPORT_H
+#define BITCOIN_MAPPORT_H
+
+/** -upnp default */
+#ifdef USE_UPNP
+static const bool DEFAULT_UPNP = USE_UPNP;
+#else
+static const bool DEFAULT_UPNP = false;
+#endif
+
+void StartMapPort();
+void InterruptMapPort();
+void StopMapPort();
+
+#endif // BITCOIN_MAPPORT_H
diff --git a/src/mapport.cpp b/src/mapport.cpp
new file mode 100644
--- /dev/null
+++ b/src/mapport.cpp
@@ -0,0 +1,141 @@
+// Copyright (c) 2011-2020 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#if defined(HAVE_CONFIG_H)
+#include <config/bitcoin-config.h>
+#endif
+
+#include <mapport.h>
+
+#include <clientversion.h>
+#include <logging.h>
+#include <net.h>
+#include <netaddress.h>
+#include <netbase.h>
+#include <threadinterrupt.h>
+#include <util/system.h>
+#include <util/thread.h>
+
+#ifdef USE_UPNP
+#include <miniupnpc/miniupnpc.h>
+#include <miniupnpc/upnpcommands.h>
+#include <miniupnpc/upnperrors.h>
+// The minimum supported miniUPnPc API version is set to 10. This keeps
+// compatibility with Ubuntu 16.04 LTS and Debian 8 libminiupnpc-dev packages.
+static_assert(MINIUPNPC_API_VERSION >= 10,
+              "miniUPnPc API version >= 10 assumed");
+#endif
+
+#include <cassert>
+#include <chrono>
+#include <functional>
+#include <string>
+#include <thread>
+
+#ifdef USE_UPNP
+static CThreadInterrupt g_upnp_interrupt;
+static std::thread g_upnp_thread;
+static void ThreadMapPort() {
+    std::string port = strprintf("%u", GetListenPort());
+    const char *multicastif = nullptr;
+    const char *minissdpdpath = nullptr;
+    struct UPNPDev *devlist = nullptr;
+    char lanaddr[64];
+
+    int error = 0;
+#if MINIUPNPC_API_VERSION < 14
+    devlist = upnpDiscover(2000, multicastif, minissdpdpath, 0, 0, &error);
+#else
+    devlist = upnpDiscover(2000, multicastif, minissdpdpath, 0, 0, 2, &error);
+#endif
+
+    struct UPNPUrls urls;
+    struct IGDdatas data;
+    int r;
+
+    r = UPNP_GetValidIGD(devlist, &urls, &data, lanaddr, sizeof(lanaddr));
+    if (r == 1) {
+        if (fDiscover) {
+            char externalIPAddress[40];
+            r = UPNP_GetExternalIPAddress(
+                urls.controlURL, data.first.servicetype, externalIPAddress);
+            if (r != UPNPCOMMAND_SUCCESS) {
+                LogPrintf("UPnP: GetExternalIPAddress() returned %d\n", r);
+            } else {
+                if (externalIPAddress[0]) {
+                    CNetAddr resolved;
+                    if (LookupHost(externalIPAddress, resolved, false)) {
+                        LogPrintf("UPnP: ExternalIPAddress = %s\n",
+                                  resolved.ToString());
+                        AddLocal(resolved, LOCAL_UPNP);
+                    }
+                } else {
+                    LogPrintf("UPnP: GetExternalIPAddress failed.\n");
+                }
+            }
+        }
+
+        std::string strDesc = PACKAGE_NAME " " + FormatFullVersion();
+
+        do {
+            r = UPNP_AddPortMapping(urls.controlURL, data.first.servicetype,
+                                    port.c_str(), port.c_str(), lanaddr,
+                                    strDesc.c_str(), "TCP", 0, "0");
+
+            if (r != UPNPCOMMAND_SUCCESS) {
+                LogPrintf(
+                    "AddPortMapping(%s, %s, %s) failed with code %d (%s)\n",
+                    port, port, lanaddr, r, strupnperror(r));
+            } else {
+                LogPrintf("UPnP Port Mapping successful.\n");
+            }
+        } while (g_upnp_interrupt.sleep_for(std::chrono::minutes(20)));
+
+        r = UPNP_DeletePortMapping(urls.controlURL, data.first.servicetype,
+                                   port.c_str(), "TCP", 0);
+        LogPrintf("UPNP_DeletePortMapping() returned: %d\n", r);
+        freeUPNPDevlist(devlist);
+        devlist = nullptr;
+        FreeUPNPUrls(&urls);
+    } else {
+        LogPrintf("No valid UPnP IGDs found\n");
+        freeUPNPDevlist(devlist);
+        devlist = nullptr;
+        if (r != 0) {
+            FreeUPNPUrls(&urls);
+        }
+    }
+}
+
+void StartMapPort() {
+    if (!g_upnp_thread.joinable()) {
+        assert(!g_upnp_interrupt);
+        g_upnp_thread = std::thread(&util::TraceThread, "upnp", &ThreadMapPort);
+    }
+}
+
+void InterruptMapPort() {
+    if (g_upnp_thread.joinable()) {
+        g_upnp_interrupt();
+    }
+}
+
+void StopMapPort() {
+    if (g_upnp_thread.joinable()) {
+        g_upnp_thread.join();
+        g_upnp_interrupt.reset();
+    }
+}
+
+#else
+void StartMapPort() {
+    // Intentionally left blank.
+}
+void InterruptMapPort() {
+    // Intentionally left blank.
+}
+void StopMapPort() {
+    // Intentionally left blank.
+}
+#endif
diff --git a/src/net.h b/src/net.h
--- a/src/net.h
+++ b/src/net.h
@@ -83,12 +83,6 @@
 static const int MAX_FEELER_CONNECTIONS = 1;
 /** -listen default */
 static const bool DEFAULT_LISTEN = true;
-/** -upnp default */
-#ifdef USE_UPNP
-static const bool DEFAULT_UPNP = USE_UPNP;
-#else
-static const bool DEFAULT_UPNP = false;
-#endif
 /**
  * The maximum number of peer connections to maintain.
  * This quantity might not be reachable on some systems, especially on platforms
@@ -224,9 +218,6 @@
 };
 
 void Discover();
-void StartMapPort();
-void InterruptMapPort();
-void StopMapPort();
 uint16_t GetListenPort();
 
 enum {
diff --git a/src/net.cpp b/src/net.cpp
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -39,16 +39,6 @@
 #include <poll.h>
 #endif
 
-#ifdef USE_UPNP
-#include <miniupnpc/miniupnpc.h>
-#include <miniupnpc/upnpcommands.h>
-#include <miniupnpc/upnperrors.h>
-// The minimum supported miniUPnPc API version is set to 10. This keeps
-// compatibility with Ubuntu 16.04 LTS and Debian 8 libminiupnpc-dev packages.
-static_assert(MINIUPNPC_API_VERSION >= 10,
-              "miniUPnPc API version >= 10 assumed");
-#endif
-
 #include <algorithm>
 #include <array>
 #include <cmath>
@@ -1926,113 +1916,6 @@
     condMsgProc.notify_one();
 }
 
-#ifdef USE_UPNP
-static CThreadInterrupt g_upnp_interrupt;
-static std::thread g_upnp_thread;
-static void ThreadMapPort() {
-    std::string port = strprintf("%u", GetListenPort());
-    const char *multicastif = nullptr;
-    const char *minissdpdpath = nullptr;
-    struct UPNPDev *devlist = nullptr;
-    char lanaddr[64];
-
-    int error = 0;
-#if MINIUPNPC_API_VERSION < 14
-    devlist = upnpDiscover(2000, multicastif, minissdpdpath, 0, 0, &error);
-#else
-    devlist = upnpDiscover(2000, multicastif, minissdpdpath, 0, 0, 2, &error);
-#endif
-
-    struct UPNPUrls urls;
-    struct IGDdatas data;
-    int r;
-
-    r = UPNP_GetValidIGD(devlist, &urls, &data, lanaddr, sizeof(lanaddr));
-    if (r == 1) {
-        if (fDiscover) {
-            char externalIPAddress[40];
-            r = UPNP_GetExternalIPAddress(
-                urls.controlURL, data.first.servicetype, externalIPAddress);
-            if (r != UPNPCOMMAND_SUCCESS) {
-                LogPrintf("UPnP: GetExternalIPAddress() returned %d\n", r);
-            } else {
-                if (externalIPAddress[0]) {
-                    CNetAddr resolved;
-                    if (LookupHost(externalIPAddress, resolved, false)) {
-                        LogPrintf("UPnP: ExternalIPAddress = %s\n",
-                                  resolved.ToString());
-                        AddLocal(resolved, LOCAL_UPNP);
-                    }
-                } else {
-                    LogPrintf("UPnP: GetExternalIPAddress failed.\n");
-                }
-            }
-        }
-
-        std::string strDesc = PACKAGE_NAME " " + FormatFullVersion();
-
-        do {
-            r = UPNP_AddPortMapping(urls.controlURL, data.first.servicetype,
-                                    port.c_str(), port.c_str(), lanaddr,
-                                    strDesc.c_str(), "TCP", 0, "0");
-
-            if (r != UPNPCOMMAND_SUCCESS) {
-                LogPrintf(
-                    "AddPortMapping(%s, %s, %s) failed with code %d (%s)\n",
-                    port, port, lanaddr, r, strupnperror(r));
-            } else {
-                LogPrintf("UPnP Port Mapping successful.\n");
-            }
-        } while (g_upnp_interrupt.sleep_for(std::chrono::minutes(20)));
-
-        r = UPNP_DeletePortMapping(urls.controlURL, data.first.servicetype,
-                                   port.c_str(), "TCP", 0);
-        LogPrintf("UPNP_DeletePortMapping() returned: %d\n", r);
-        freeUPNPDevlist(devlist);
-        devlist = nullptr;
-        FreeUPNPUrls(&urls);
-    } else {
-        LogPrintf("No valid UPnP IGDs found\n");
-        freeUPNPDevlist(devlist);
-        devlist = nullptr;
-        if (r != 0) {
-            FreeUPNPUrls(&urls);
-        }
-    }
-}
-
-void StartMapPort() {
-    if (!g_upnp_thread.joinable()) {
-        assert(!g_upnp_interrupt);
-        g_upnp_thread = std::thread(&util::TraceThread, "upnp", &ThreadMapPort);
-    }
-}
-
-void InterruptMapPort() {
-    if (g_upnp_thread.joinable()) {
-        g_upnp_interrupt();
-    }
-}
-
-void StopMapPort() {
-    if (g_upnp_thread.joinable()) {
-        g_upnp_thread.join();
-        g_upnp_interrupt.reset();
-    }
-}
-
-#else
-void StartMapPort() {
-    // Intentionally left blank.
-}
-void InterruptMapPort() {
-    // Intentionally left blank.
-}
-void StopMapPort() {
-    // Intentionally left blank.
-}
-#endif
-
 void CConnman::ThreadDNSAddressSeed() {
     FastRandomContext rng;
     std::vector<std::string> seeds =
diff --git a/src/qt/optionsmodel.cpp b/src/qt/optionsmodel.cpp
--- a/src/qt/optionsmodel.cpp
+++ b/src/qt/optionsmodel.cpp
@@ -9,6 +9,7 @@
 #include <qt/optionsmodel.h>
 
 #include <interfaces/node.h>
+#include <mapport.h>
 #include <net.h>
 #include <netbase.h>
 #include <qt/bitcoinunits.h>