zerotier · adamierymenko · Jan 20, 2026 · Nov 4, 2025 · Nov 4, 2025 · Nov 5, 2025
diff --git a/RELEASE-NOTES.md b/RELEASE-NOTES.md
@@ -1,6 +1,13 @@
 ZeroTier Release Notes
 ======
 
+## 2025-12-22 -- Version 1.16.1
+
+  * Metrics collection is now disabled by default. It can be enabled via the `enableMetrics` setting in `local.conf`.
+  * Fix for an issue where metrics were not being recorded while running in daemon mode.
+  * Fix debug dumpfile being written to the root directory.
+  * Minor bug fixes in Mac and BSD tun/tap code.
+
 ## 2025-08-21 -- Version 1.16.0
 
   * License Changes

diff --git a/debian/changelog b/debian/changelog
@@ -1,3 +1,9 @@
+zerotier-one (1.16.1) unstable; urgency=medium
+
+  * See RELEASE-NOTES.md for release notes.
+
+ -- Adam Ierymenko <adam.ierymenko@zerotier.com>  Mon, 12 Dec 2025 01:00:00 -0700
+
 zerotier-one (1.16.0-2) unstable; urgency=medium
 
   * Fix build settings to include controller.

diff --git a/ext/installfiles/mac/ZeroTier One.pkgproj b/ext/installfiles/mac/ZeroTier One.pkgproj
@@ -702,7 +702,7 @@
 				<key>USE_HFS+_COMPRESSION</key>
 				<false />
 				<key>VERSION</key>
-				<string>1.16.0</string>
+				<string>1.16.1</string>
 			</dict>
 			<key>TYPE</key>
 			<integer>0</integer>

diff --git a/ext/installfiles/windows/ZeroTier One.aip b/ext/installfiles/windows/ZeroTier One.aip
@@ -21,10 +21,10 @@
     <ROW Property="AiFeatIcoZeroTierOne" Value="ZeroTierIcon.exe" Type="8"/>
     <ROW Property="MSIFASTINSTALL" MultiBuildValue="DefaultBuild:2"/>
     <ROW Property="Manufacturer" Value="ZeroTier, Inc."/>
-    <ROW Property="ProductCode" Value="1033:{C805CD5B-45F5-49F7-B428-142396DE03CA} " Type="16"/>
+    <ROW Property="ProductCode" Value="1033:{83B4ADDB-1653-4B88-AE50-614649687DA9} " Type="16"/>
     <ROW Property="ProductLanguage" Value="1033"/>
     <ROW Property="ProductName" Value="ZeroTier One"/>
-    <ROW Property="ProductVersion" Value="1.16.0" Options="32"/>
+    <ROW Property="ProductVersion" Value="1.16.1" Options="32"/>
     <ROW Property="REBOOT" MultiBuildValue="DefaultBuild:ReallySuppress"/>
     <ROW Property="SecureCustomProperties" Value="OLDPRODUCTS;AI_NEWERPRODUCTFOUND;AI_SETUPEXEPATH;SETUPEXEDIR"/>
     <ROW Property="UpgradeCode" Value="{B0E2A5F3-88B6-4E77-B922-CB4739B4C4C8}"/>
@@ -62,7 +62,7 @@
     <ROW Directory="regid.201001.com.zerotier_Dir" Directory_Parent="CommonAppDataFolder" DefaultDir="REGID2~1.ZER|regid.2010-01.com.zerotier" DirectoryOptions="12"/>
   </COMPONENT>
   <COMPONENT cid="caphyon.advinst.msicomp.MsiCompsComponent">
-    <ROW Component="AI_CustomARPName" ComponentId="{A3752E9B-9B23-4433-B186-24C3C5C4BC4A}" Directory_="APPDIR" Attributes="4" KeyPath="DisplayName" Options="1"/>
+    <ROW Component="AI_CustomARPName" ComponentId="{8633F45B-5725-4FB8-B1B6-D945785D4629}" Directory_="APPDIR" Attributes="4" KeyPath="DisplayName" Options="1"/>
     <ROW Component="AI_DisableModify" ComponentId="{46FFA8C5-A0CB-4E05-9AD3-911D543DE8CA}" Directory_="APPDIR" Attributes="4" KeyPath="NoModify" Options="1"/>
     <ROW Component="AI_ExePath" ComponentId="{8E02B36C-7A19-429B-A93E-77A9261AC918}" Directory_="APPDIR" Attributes="4" KeyPath="AI_ExePath"/>
     <ROW Component="APPDIR" ComponentId="{4DD7907D-D7FE-4CD6-B1A0-B5C1625F5133}" Directory_="APPDIR" Attributes="0"/>
@@ -515,7 +515,7 @@
     <ROW XmlAttribute="xsischemaLocation" XmlElement="swidsoftware_identification_tag" Name="xsi:schemaLocation" Flags="14" Order="3" Value="http://standards.iso.org/iso/19770/-2/2008/schema.xsd software_identification_tag.xsd"/>
   </COMPONENT>
   <COMPONENT cid="caphyon.advinst.msicomp.XmlElementComponent">
-    <ROW XmlElement="swidbuild" ParentElement="swidnumeric" Name="swid:build" Condition="1" Order="2" Flags="14" Text="0" UpdateIndexInParent="0"/>
+    <ROW XmlElement="swidbuild" ParentElement="swidnumeric" Name="swid:build" Condition="1" Order="2" Flags="14" Text="1" UpdateIndexInParent="0"/>
     <ROW XmlElement="swidentitlement_required_indicator" ParentElement="swidsoftware_identification_tag" Name="swid:entitlement_required_indicator" Condition="1" Order="0" Flags="14" Text="false" UpdateIndexInParent="0"/>
     <ROW XmlElement="swidmajor" ParentElement="swidnumeric" Name="swid:major" Condition="1" Order="0" Flags="14" Text="1" UpdateIndexInParent="0"/>
     <ROW XmlElement="swidminor" ParentElement="swidnumeric" Name="swid:minor" Condition="1" Order="1" Flags="14" Text="16" UpdateIndexInParent="0"/>

diff --git a/ext/installfiles/windows/ZeroTier One.back.aip b/ext/installfiles/windows/ZeroTier One.back.aip
diff --git a/ext/prometheus-cpp-lite-1.0/core/include/prometheus/save_to_file.h b/ext/prometheus-cpp-lite-1.0/core/include/prometheus/save_to_file.h
@@ -50,6 +50,16 @@ namespace prometheus {
   public:
     SaveToFile() = default;
 
+    void stop() {
+      must_die = true;
+      worker_thread.join();
+    }
+
+    void restart() {
+      must_die = false;
+      worker_thread = std::thread(&SaveToFile::worker_function, this);
+    }
+
     ~SaveToFile() {
       must_die = true;
       worker_thread.join();

diff --git a/one.cpp b/one.cpp
@@ -1196,12 +1196,13 @@ static int cli(int argc, char** argv)
 			return 0;
 		}
 
-		snprintf((char*)path, sizeof(path), "%s%szerotier_dump.txt", (char*)path, ZT_PATH_SEPARATOR_S);
+		char dumpfile[PATH_MAX];
+		snprintf(dumpfile, sizeof(dumpfile), "%s%szerotier_dump.txt", (char*)path, ZT_PATH_SEPARATOR_S);
 
-		fprintf(stdout, "Writing dump to: %s\n", path);
-		int fd = open((char*)path, O_CREAT | O_RDWR, 0664);
+		fprintf(stdout, "Writing dump to: %s\n", dumpfile);
+		int fd = open(dumpfile, O_CREAT | O_WRONLY | O_TRUNC, 0664);
 		if (fd == -1) {
-			fprintf(stderr, "Error creating file.\n");
+			perror("Error creating file");
 			return 1;
 		}
 		write(fd, dump.str().c_str(), dump.str().size());
@@ -1278,9 +1279,9 @@ static int cli(int argc, char** argv)
 				return 0;
 			}
 
-			BOOL err = WriteFile(file, dump.str().c_str(), dump.str().size(), NULL, NULL);
-			if (err = FALSE) {
-				fprintf(stderr, "Error writing file");
+			BOOL ok = WriteFile(file, dump.str().c_str(), dump.str().size(), NULL, NULL);
+			if (ok == FALSE) {
+				fprintf(stderr, "Error writing file\n");
 				return 1;
 			}
 			CloseHandle(file);
@@ -1346,12 +1347,15 @@ static int cli(int argc, char** argv)
 		}
 		close(sock);
 		char cwd[16384];
-		getcwd(cwd, sizeof(cwd));
-		snprintf(cwd, sizeof(cwd), "%s%szerotier_dump.txt", cwd, ZT_PATH_SEPARATOR_S);
-		fprintf(stdout, "Writing dump to: %s\n", cwd);
-		int fd = open(cwd, O_CREAT | O_RDWR, 0664);
+		if (getcwd(cwd, sizeof(cwd)) == nullptr) {
+			strcpy(cwd, ".");
+		}
+		char dumpfile[sizeof(cwd) + 32];
+		snprintf(dumpfile, sizeof(dumpfile), "%s%szerotier_dump.txt", cwd, ZT_PATH_SEPARATOR_S);
+		fprintf(stdout, "Writing dump to: %s\n", dumpfile);
+		int fd = open(dumpfile, O_CREAT | O_WRONLY | O_TRUNC, 0664);
 		if (fd == -1) {
-			fprintf(stderr, "Error creating file.\n");
+			perror("Error creating file");
 			return 1;
 		}
 		write(fd, dump.str().c_str(), dump.str().size());
@@ -2330,14 +2334,18 @@ int main(int argc, char** argv)
 	}
 #endif	 // !ZT_ONE_NO_ROOT_CHECK
 	if (runAsDaemon) {
+		prometheus::simpleapi::saver.stop();
+
 		long p = (long)fork();
 		if (p < 0) {
 			fprintf(stderr, "%s: could not fork" ZT_EOL_S, argv[0]);
 			return 1;
 		}
 		else if (p > 0)
-			return 0;	// forked
+			_Exit(0);	// forked
 						// else p == 0, so we are daemonized
+
+		prometheus::simpleapi::saver.restart();
 	}
 #endif	 // __UNIX_LIKE__
 

diff --git a/osdep/BSDEthernetTap.cpp b/osdep/BSDEthernetTap.cpp
@@ -339,7 +339,7 @@ std::vector<InetAddress> BSDEthernetTap::ips() const
 		freeifaddrs(ifa);
 
 	std::sort(r.begin(), r.end());
-	std::unique(r.begin(), r.end());
+	r.erase(std::unique(r.begin(), r.end()), r.end());
 
 	_ifaddrs = r;
 
@@ -394,7 +394,7 @@ void BSDEthernetTap::scanMulticastGroups(std::vector<MulticastGroup>& added, std
 		newGroups.push_back(MulticastGroup::deriveMulticastGroupForAddressResolution(*ip));
 
 	std::sort(newGroups.begin(), newGroups.end());
-	std::unique(newGroups.begin(), newGroups.end());
+	newGroups.erase(std::unique(newGroups.begin(), newGroups.end()), newGroups.end());
 
 	for (std::vector<MulticastGroup>::iterator m(newGroups.begin()); m != newGroups.end(); ++m) {
 		if (! std::binary_search(_multicastGroups.begin(), _multicastGroups.end(), *m))

diff --git a/osdep/MacKextEthernetTap.cpp b/osdep/MacKextEthernetTap.cpp
@@ -607,7 +607,7 @@ void MacKextEthernetTap::scanMulticastGroups(std::vector<MulticastGroup>& added,
 		newGroups.push_back(MulticastGroup::deriveMulticastGroupForAddressResolution(*ip));
 
 	std::sort(newGroups.begin(), newGroups.end());
-	std::unique(newGroups.begin(), newGroups.end());
+	newGroups.erase(std::unique(newGroups.begin(), newGroups.end()), newGroups.end());
 
 	for (std::vector<MulticastGroup>::iterator m(newGroups.begin()); m != newGroups.end(); ++m) {
 		if (! std::binary_search(_multicastGroups.begin(), _multicastGroups.end(), *m))

diff --git a/osdep/NetBSDEthernetTap.cpp b/osdep/NetBSDEthernetTap.cpp
@@ -316,7 +316,7 @@ std::vector<InetAddress> NetBSDEthernetTap::ips() const
 		freeifaddrs(ifa);
 
 	std::sort(r.begin(), r.end());
-	std::unique(r.begin(), r.end());
+	r.erase(std::unique(r.begin(), r.end()), r.end());
 
 	return r;
 }
@@ -367,7 +367,7 @@ void NetBSDEthernetTap::scanMulticastGroups(std::vector<MulticastGroup>& added,
 		newGroups.push_back(MulticastGroup::deriveMulticastGroupForAddressResolution(*ip));
 
 	std::sort(newGroups.begin(), newGroups.end());
-	std::unique(newGroups.begin(), newGroups.end());
+	newGroups.erase(std::unique(newGroups.begin(), newGroups.end()), newGroups.end());
 
 	for (std::vector<MulticastGroup>::iterator m(newGroups.begin()); m != newGroups.end(); ++m) {
 		if (! std::binary_search(_multicastGroups.begin(), _multicastGroups.end(), *m))

diff --git a/service/OneService.cpp b/service/OneService.cpp
@@ -988,7 +988,6 @@ class OneServiceImpl : public OneService {
 		_ports[1] = 0;
 		_ports[2] = 0;
 
-		prometheus::simpleapi::saver.set_registry(prometheus::simpleapi::registry_ptr);
 		prometheus::simpleapi::saver.set_delay(std::chrono::seconds(5));
 		prometheus::simpleapi::saver.set_out_file(_homePath + ZT_PATH_SEPARATOR + "metrics.prom");
 
@@ -2610,8 +2609,8 @@ class OneServiceImpl : public OneService {
 		_controlPlaneV6.set_pre_routing_handler(authCheck);
 
 #if ZT_DEBUG == 1
-		_controlPlane.set_logger([](const httplib::Request& req, const httplib::Response& res) { fprintf(stderr, "%s", http_log(req, res).c_str()); });
-		_controlPlaneV6.set_logger([](const httplib::Request& req, const httplib::Response& res) { fprintf(stderr, "%s", http_log(req, res).c_str()); });
+		//_controlPlane.set_logger([](const httplib::Request& req, const httplib::Response& res) { fprintf(stderr, "%s", http_log(req, res).c_str()); });
+		//_controlPlaneV6.set_logger([](const httplib::Request& req, const httplib::Response& res) { fprintf(stderr, "%s", http_log(req, res).c_str()); });
 #endif
 		if (_primaryPort == 0) {
 			fprintf(stderr, "unable to determine local control port");
@@ -2931,6 +2930,15 @@ class OneServiceImpl : public OneService {
 					_allowManagementFrom.push_back(nw);
 			}
 		}
+
+		bool enableMetrics = OSUtils::jsonBool(settings["enableMetrics"], false);
+		if (enableMetrics) {
+			prometheus::simpleapi::saver.set_registry(prometheus::simpleapi::registry_ptr);
+		}
+		else {
+			std::shared_ptr<prometheus::Registry> registry;
+			prometheus::simpleapi::saver.set_registry(registry);
+		}
 	}
 
 #if ZT_VAULT_SUPPORT

diff --git a/service/README.md b/service/README.md
@@ -41,7 +41,7 @@ Settings available in `local.conf` (this is not valid JSON, and JSON does not al
 		"allowManagementFrom": [ "NETWORK/bits", ...] |null, /* If non-NULL, allow JSON/HTTP management from this IP network. Default is 127.0.0.1 only. */
 		"bind": [ "ip",... ], /* If present and non-null, bind to these IPs instead of to each interface (wildcard IP allowed) */
 		"allowTcpFallbackRelay": true|false, /* Allow or disallow establishment of TCP relay connections (true by default) */
-		"multipathMode": 0|1|2 /* multipath mode: none (0), random (1), proportional (2) */
+		"enableMetrics": true|false /* If true, enable the collection of metrics in metrics.prom. */
 	}
 }
 ```

diff --git a/version.h b/version.h
@@ -22,7 +22,7 @@
 /**
  * Revision
  */
-#define ZEROTIER_ONE_VERSION_REVISION 0
+#define ZEROTIER_ONE_VERSION_REVISION 1
 
 /**
  * Build version

diff --git a/zerotier-one.spec b/zerotier-one.spec
@@ -1,5 +1,5 @@
 Name:           zerotier-one
-Version:        1.16.0
+Version:        1.16.1
 Release:        1%{?dist}
 Summary:        ZeroTier network virtualization service
 
@@ -155,6 +155,9 @@ chmod 0755 $RPM_BUILD_ROOT/etc/init.d/zerotier-one
 %endif
 
 %changelog
+* Fri Dec 12 2025 Adam Ierymenko <adam.ierymenko@zerotier.com> - 1.16.1
+- see https://github.com/zerotier/ZeroTierOne for release notes
+
 * Wed Oct 23 2024 Adam Ierymenko <adam.ierymenko@zerotier.com> - 1.14.2
 - see https://github.com/zerotier/ZeroTierOne for release notes