diff --git a/include/ZeroTier.h b/include/ZeroTier.h
index 60aa17e..464d56c 100644
--- a/include/ZeroTier.h
+++ b/include/ZeroTier.h
@@ -555,7 +555,7 @@ ZT_SOCKET_API int ZTCALL zts_core_running();
  * @usage Call this after zts_start(), zts_startjoin() and/or zts_join()
  * @return Number of networks joined by this node
  */
-ZT_SOCKET_API int ZTCALL zts_get_num_joined_networks();
+ZT_SOCKET_API size_t ZTCALL zts_get_num_joined_networks();
 
 /**
  * @brief Populates a structure with details for a given network
@@ -749,7 +749,7 @@ ZT_SOCKET_API int zts_get_peer_count();
  * @usage Call this after zts_start() has succeeded
  * @return
  */
-ZT_SOCKET_API int zts_get_peers(struct zts_peer_details *pds, int *num);
+ZT_SOCKET_API int zts_get_peers(struct zts_peer_details *pds, unsigned int *num);
 
 /**
  * @brief Return details of a given peer.
diff --git a/src/Controls.cpp b/src/Controls.cpp
index f3befdc..d2c00f5 100644
--- a/src/Controls.cpp
+++ b/src/Controls.cpp
@@ -298,8 +298,8 @@ void *_zts_run_callbacks(void *thread_id)
 	while (_run_callbacks || _callbackMsgQueue.size_approx() > 0)
     {
         struct zts_callback_msg *msg;
-		int sz = _callbackMsgQueue.size_approx();
-		for (int j = 0; j < sz; j++) {
+		size_t sz = _callbackMsgQueue.size_approx();
+		for (size_t j = 0; j < sz; j++) {
 			if (_callbackMsgQueue.try_dequeue(msg)) {
 				_process_callback_event(msg);
 				delete msg;
@@ -695,7 +695,6 @@ JNIEXPORT void JNICALL Java_com_zerotier_libzt_ZeroTier_restart(
 int zts_free()
 {
 	Mutex::Lock _l(_service_lock);
-	int retval = 0;
 	if (_freeHasBeenCalled) {
 		return ZTS_ERR_INVALID_OP;
 	}
@@ -735,6 +734,7 @@ int zts_get_6plane_addr(struct sockaddr_storage *addr, const uint64_t nwid, cons
 	InetAddress _6planeAddr = InetAddress::makeIpv66plane(nwid,nodeId);
 	struct sockaddr_in6 *in6 = (struct sockaddr_in6*)addr;
 	memcpy(in6->sin6_addr.s6_addr, _6planeAddr.rawIpData(), sizeof(struct in6_addr));
+	return ZTS_ERR_OK;
 }
 
 int zts_get_rfc4193_addr(struct sockaddr_storage *addr, const uint64_t nwid, const uint64_t nodeId)
@@ -745,6 +745,7 @@ int zts_get_rfc4193_addr(struct sockaddr_storage *addr, const uint64_t nwid, con
 	InetAddress _rfc4193Addr = InetAddress::makeIpv6rfc4193(nwid,nodeId);
 	struct sockaddr_in6 *in6 = (struct sockaddr_in6*)addr;
 	memcpy(in6->sin6_addr.s6_addr, _rfc4193Addr.rawIpData(), sizeof(struct in6_addr));
+	return ZTS_ERR_OK;
 }
 
 uint64_t zts_generate_adhoc_nwid_from_range(uint16_t startPortOfRange, uint16_t endPortOfRange)
@@ -774,7 +775,7 @@ JNIEXPORT jlong JNICALL Java_com_zerotier_libzt_ZeroTier_get_1peer_1count(
 }
 #endif
 
-int zts_get_peers(struct zts_peer_details *pds, int *num)
+int zts_get_peers(struct zts_peer_details *pds, unsigned int *num)
 {
 	Mutex::Lock _l(_service_lock);
 	if (!pds || !num) {
@@ -792,7 +793,7 @@ int zts_get_peers(struct zts_peer_details *pds, int *num)
 		*num = pl->peerCount;
 		for(unsigned long i=0;i<pl->peerCount;++i) {
 			memcpy(&(pds[i]), &(pl->peers[i]), sizeof(struct zts_peer_details));
-			for (int j=0; j<pl->peers[i].pathCount; j++) {
+			for (unsigned int j=0; j<pl->peers[i].pathCount; j++) {
 				memcpy(&(pds[i].paths[j].address),
 					&(pl->peers[i].paths[j].address), sizeof(struct sockaddr_storage));
 			}
@@ -819,7 +820,7 @@ int zts_get_peer(struct zts_peer_details *pd, uint64_t peerId)
 		for(unsigned long i=0;i<pl->peerCount;++i) {
 			if (pl->peers[i].address == peerId) {
 				memcpy(pd, &(pl->peers[i]), sizeof(struct zts_peer_details));
-				for (int j=0; j<pl->peers[i].pathCount; j++) {
+				for (unsigned int j=0; j<pl->peers[i].pathCount; j++) {
 					memcpy(&(pd->paths[j].address),
 						&(pl->peers[i].paths[j].address), sizeof(struct sockaddr_storage));
 				}
@@ -838,10 +839,9 @@ int zts_get_peer(struct zts_peer_details *pd, uint64_t peerId)
 // Networks                                                                 //
 //////////////////////////////////////////////////////////////////////////////
 
-int zts_get_num_joined_networks()
+size_t zts_get_num_joined_networks()
 {
 	Mutex::Lock _l(_service_lock);
-	int retval = ZTS_ERR_OK;
 	if (!_zts_can_perform_service_operation()) {
 		return ZTS_ERR_SERVICE;
 	}
diff --git a/src/Service.cpp b/src/Service.cpp
index b3bc011..e9e587a 100644
--- a/src/Service.cpp
+++ b/src/Service.cpp
@@ -439,11 +439,9 @@ public:
 			_lastRestart = clockShouldBe;
 			int64_t lastTapMulticastGroupCheck = 0;
 			int64_t lastBindRefresh = 0;
-			int64_t lastUpdateCheck = clockShouldBe;
 			int64_t lastMultipathModeUpdate = 0;
 			int64_t lastCleanedPeersDb = 0;
 			int64_t lastLocalInterfaceAddressCheck = (clockShouldBe - ZT_LOCAL_INTERFACE_CHECK_INTERVAL) + 15000; // do this in 15s to give portmapper time to configure and other things time to settle
-			int64_t lastLocalConfFileCheck = OSUtils::now();
 			for(;;) {
 				_run_m.lock();
 				if (!_run) {
@@ -891,12 +889,12 @@ public:
 				}
 				// Previously known peer, update status
 				else {
-					if (peerCache[pl->peers[i].address] == 0 && pl->peers[i].pathCount > 0) {
+					if ((peerCache[pl->peers[i].address] == false) && pl->peers[i].pathCount > 0) {
 						pd = new zts_peer_details;
 						memcpy(pd, &(pl->peers[i]), sizeof(struct zts_peer_details));
 						postEvent(ZTS_EVENT_PEER_P2P, (void*)pd);
 					}
-					if (peerCache[pl->peers[i].address] > 0 && pl->peers[i].pathCount == 0) {
+					if ((peerCache[pl->peers[i].address] == true) && pl->peers[i].pathCount == 0) {
 						pd = new zts_peer_details;
 						memcpy(pd, &(pl->peers[i]), sizeof(struct zts_peer_details));
 						postEvent(ZTS_EVENT_PEER_RELAY, (void*)pd);
@@ -909,7 +907,7 @@ public:
 		_node->freeQueryResult((void *)pl);
 	}
 
-	inline int networkCount()
+	inline size_t networkCount()
 	{
 		Mutex::Lock _l(_nets_m);
 		return _nets.size();
@@ -974,6 +972,9 @@ public:
 					OSUtils::ztsnprintf(p,sizeof(p),"%s" ZT_PATH_SEPARATOR_S "%.16llx.conf",dirname,(unsigned long long)id[0]);
 					secure = true;
 				}
+				else {
+					return;
+				}
 				break;
 			case ZT_STATE_OBJECT_PEER:
 				if (_peer_caching_enabled) {
@@ -1034,6 +1035,9 @@ public:
 				if (_network_caching_enabled) {
 					OSUtils::ztsnprintf(p,sizeof(p),"%s" ZT_PATH_SEPARATOR_S "networks.d" ZT_PATH_SEPARATOR_S "%.16llx.conf",_homePath.c_str(),(unsigned long long)id[0]);
 				}
+				else {
+					return -1;
+				}
 				break;
 			case ZT_STATE_OBJECT_PEER:
 				if (_peer_caching_enabled) {
diff --git a/src/Service.hpp b/src/Service.hpp
index cc44b61..b111d5f 100644
--- a/src/Service.hpp
+++ b/src/Service.hpp
@@ -152,7 +152,7 @@ public:
 	 */
 	virtual void getRoutes(uint64_t nwid, void *routeArray, unsigned int *numRoutes) = 0;
 
-	virtual int networkCount() = 0;
+	virtual size_t networkCount() = 0;
 	virtual void leaveAll() = 0;
 	virtual void join(uint64_t nwid) = 0;
 	virtual void leave(uint64_t nwid) = 0;
diff --git a/src/VirtualTap.cpp b/src/VirtualTap.cpp
index b4272d9..88b6861 100644
--- a/src/VirtualTap.cpp
+++ b/src/VirtualTap.cpp
@@ -156,7 +156,7 @@ bool VirtualTap::addIp(const InetAddress &ip)
 		return false;
 	}
 	if (std::find(_ips.begin(),_ips.end(),ip) == _ips.end()) {
-		lwip_init_interface((void*)this, this->_mac, ip);
+		lwip_init_interface((void*)this, ip);
 		// TODO: Add ZTS_EVENT_ADDR_NEW ?
 		_ips.push_back(ip);
 		// Send callback message
diff --git a/src/lwipDriver.cpp b/src/lwipDriver.cpp
index 454b602..b8fa9e2 100644
--- a/src/lwipDriver.cpp
+++ b/src/lwipDriver.cpp
@@ -36,7 +36,10 @@
 #include "lwip/ip_addr.h"
 #include "lwip/nd6.h"
 #include "lwip/netifapi.h"
+
+#ifdef LWIP_STATS
 #include "lwip/stats.h"
+#endif
 
 #include "VirtualTap.hpp"
 #include "lwipDriver.hpp"
@@ -143,7 +146,7 @@ void lwip_driver_init()
 #if defined(_WIN32)
 	sys_init(); // Required for win32 init of critical sections
 #endif
-	void *st = (void*)sys_thread_new(ZTS_LWIP_DRIVER_THREAD_NAME, main_lwip_driver_loop,
+	sys_thread_new(ZTS_LWIP_DRIVER_THREAD_NAME, main_lwip_driver_loop,
 		NULL, DEFAULT_THREAD_STACKSIZE, DEFAULT_THREAD_PRIO);
 }
 
@@ -255,7 +258,7 @@ void lwip_eth_rx(VirtualTap *tap, const MAC &from, const MAC &to, unsigned int e
 		*/
 	}
 
-	p = pbuf_alloc(PBUF_RAW, len+sizeof(struct eth_hdr), PBUF_RAM);
+	p = pbuf_alloc(PBUF_RAW, (uint16_t)len+sizeof(struct eth_hdr), PBUF_RAM);
 	if (!p) {
 		DEBUG_ERROR("dropped packet: unable to allocate memory for pbuf");
 		return;
@@ -461,7 +464,7 @@ static err_t netif_init6(struct netif *n)
 	return ERR_OK;
 }
 
-void lwip_init_interface(void *tapref, const MAC &mac, const InetAddress &ip)
+void lwip_init_interface(void *tapref, const InetAddress &ip)
 {
 	char ipbuf[INET6_ADDRSTRLEN];
 	char macbuf[ZTS_MAC_ADDRSTRLEN];
diff --git a/src/lwipDriver.hpp b/src/lwipDriver.hpp
index 7467c7e..c2bcd9a 100644
--- a/src/lwipDriver.hpp
+++ b/src/lwipDriver.hpp
@@ -138,11 +138,10 @@ static void netif_link_callback(struct netif *netif);
  *
  * @param
  * @param tapref Reference to VirtualTap that will be responsible for sending and receiving data
- * @param mac Virtual hardware address for this ZeroTier VirtualTap interface
  * @param ip Virtual IP address for this ZeroTier VirtualTap interface
  * @return
  */
-void lwip_init_interface(void *tapref, const MAC &mac, const InetAddress &ip);
+void lwip_init_interface(void *tapref, const InetAddress &ip);
 
 /**
  * @brief Called from the stack, outbound ethernet frames from the network stack enter the ZeroTier virtual wire here.