diff --git a/package/luci/files/luci/i18n/smartdns.zh-cn.po b/package/luci/files/luci/i18n/smartdns.zh-cn.po
index 1d03550..567cdf1 100644
--- a/package/luci/files/luci/i18n/smartdns.zh-cn.po
+++ b/package/luci/files/luci/i18n/smartdns.zh-cn.po
@@ -112,6 +112,60 @@ msgstr "设置所有域名的TTL最大值"
 msgid "smartdns custom settings"
 msgstr "smartdns 自定义设置，具体配置参数参考指导"
 
+msgid "Second Server Settings"
+msgstr "第二DNS服务器"
+
+msgid "Enable or disable second DNS server."
+msgstr "是否启用第二DNS服务器。"
+
+msgid "Skip Speed Check"
+msgstr "跳过测速"
+
+msgid "Do not check speed."
+msgstr "禁用测速。"
+
+msgid "Server Group"
+msgstr "服务器组"
+
+msgid "Query DNS through specific dns server group, such as office, home."
+msgstr "使用指定服务器组查询，比如office, home。"
+
+msgid "Skip Address Rules"
+msgstr "跳过address规则"
+
+msgid "Skip address rules."
+msgstr "跳过address规则。"
+
+msgid "Skip Nameserver Rule"
+msgstr "跳过Nameserver规则"
+
+msgid "Skip nameserver rules."
+msgstr "跳过Nameserver规则。"
+
+msgid "Skip Ipset Rule"
+msgstr "跳过ipset规则"
+
+msgid "Skip ipset rules."
+msgstr "跳过ipset规则。"
+
+msgid "Skip SOA Address Rule"
+msgstr "跳过address SOA(#)规则"
+
+msgid "Skip SOA address rules."
+msgstr "跳过address SOA(#)规则。"
+
+msgid "Skip Dualstack Selection"
+msgstr "跳过双栈优选"
+
+msgid "Skip Sualstack Selection."
+msgstr "跳过双栈优选。"
+
+msgid "Skip Cache"
+msgstr "跳过cache"
+
+msgid "Skip Cache."
+msgstr "跳过cache。"
+
 msgid "Upstream Servers"
 msgstr "上游服务器"
 
@@ -142,8 +196,8 @@ msgstr "域名地址"
 msgid "TLS Hostname Verify"
 msgstr "校验TLS主机名"
 
-msgid "Set TLS hostname to verify"
-msgstr "设置校验TLS主机名"
+msgid "Set TLS hostname to verify."
+msgstr "设置校验TLS主机名。"
 
 msgid "TLS SNI name"
 msgstr "TLS SNI名称"
@@ -151,8 +205,8 @@ msgstr "TLS SNI名称"
 msgid "HTTP Host"
 msgstr "HTTP主机"
 
-msgid "Sets the server name indication"
-msgstr "设置服务器SNI名称"
+msgid "Sets the server name indication for query."
+msgstr "设置查询时使用的服务器SNI名称。"
 
 msgid "Set the HTTP host used for the query. Use this parameter when the host of the URL address is an IP address."
 msgstr "设置查询时使用的HTTP主机，当URL地址的host是IP地址时，使用此参数。"
@@ -160,7 +214,7 @@ msgstr "设置查询时使用的HTTP主机，当URL地址的host是IP地址时
 msgid "Server Group"
 msgstr "服务器组"
 
-msgid "DNS Server group belongs to, used with nameserver, such as offlce, home."
+msgid "DNS Server group belongs to, used with nameserver, such as office, home."
 msgsr "DNS服务器所属组， 配合nameserver使用，例如：office，home。"
 
 msgid "IP Blacklist Filtering"
diff --git a/package/luci/files/luci/model/cbi/smartdns/smartdns.lua b/package/luci/files/luci/model/cbi/smartdns/smartdns.lua
index 5d1a475..79bb815 100644
--- a/package/luci/files/luci/model/cbi/smartdns/smartdns.lua
+++ b/package/luci/files/luci/model/cbi/smartdns/smartdns.lua
@@ -16,6 +16,7 @@ s = m:section(TypedSection, "smartdns", translate("Settings"), translate("Genera
 s.anonymous = true
 
 s:tab("settings", translate("General Settings"))
+s:tab("seconddns", translate("Second Server Settings"))
 s:tab("custom", translate("Custom Settings"))
 
 ---- Eanble
@@ -92,10 +93,92 @@ o.placeholder = "300"
 o.default     = 300
 o.optional    = true
 
+---- second dns server
 ---- rr-ttl-max
 o = s:taboption("settings", Value, "rr_ttl_max", translate("Domain TTL Max"), translate("Maximum TTL for all domain result."))
 o.rempty      = true
 
+---- Eanble
+o = s:taboption("seconddns", Flag, "seconddns_enabled", translate("Enable"), translate("Enable or disable second DNS server."))
+o.default     = o.disabled
+o.rempty      = false
+
+---- Port
+o = s:taboption("seconddns", Value, "seconddns_port", translate("Local Port"), translate("Smartdns local server port"))
+o.placeholder = 7053
+o.default     = 7053
+o.datatype    = "port"
+o.rempty      = false
+
+---- Enable TCP server
+o = s:taboption("seconddns", Flag, "seconddns_tcp_server", translate("TCP Server"), translate("Enable TCP DNS Server"))
+o.rmempty     = false
+o.default     = o.enabled
+o.cfgvalue    = function(...)
+    return Flag.cfgvalue(...) or "1"
+end
+
+o = s:taboption("seconddns", Flag, "seconddns_no_speed_check", translate("Skip Speed Check"), translate("Do not check speed."))
+o.rmempty     = false
+o.default     = o.disabled
+o.cfgvalue    = function(...)
+    return Flag.cfgvalue(...) or "0"
+end
+
+---- dns server group
+o = s:taboption("seconddns", Value, "seconddns_server_group", translate("Server Group"), translate("Query DNS through specific dns server group, such as office, home."))
+o.rmempty     = true
+o.placeholder = "default"
+o.datatype    = "hostname"
+o.rempty      = true
+
+---- skip address rules
+o = s:taboption("seconddns", Flag, "seconddns_no_rule_addr", translate("Skip Address Rules"), translate("Skip address rules."))
+o.rmempty     = false
+o.default     = o.disabled
+o.cfgvalue    = function(...)
+    return Flag.cfgvalue(...) or "0"
+end
+
+---- skip name server rules
+o = s:taboption("seconddns", Flag, "seconddns_no_rule_nameserver", translate("Skip Nameserver Rule"), translate("Skip nameserver rules."))
+o.rmempty     = false
+o.default     = o.disabled
+o.cfgvalue    = function(...)
+    return Flag.cfgvalue(...) or "0"
+end
+
+---- skip ipset rules
+o = s:taboption("seconddns", Flag, "seconddns_no_rule_ipset", translate("Skip Ipset Rule"), translate("Skip ipset rules."))
+o.rmempty     = false
+o.default     = o.disabled
+o.cfgvalue    = function(...)
+    return Flag.cfgvalue(...) or "0"
+end
+
+---- skip soa address rule
+o = s:taboption("seconddns", Flag, "seconddns_no_rule_soa", translate("Skip SOA Address Rule"), translate("Skip SOA address rules."))
+o.rmempty     = false
+o.default     = o.disabled
+o.cfgvalue    = function(...)
+    return Flag.cfgvalue(...) or "0"
+end
+
+o = s:taboption("seconddns", Flag, "seconddns_no_dualstack_selection", translate("Skip Dualstack Selection"), translate("Skip Sualstack Selection."))
+o.rmempty     = false
+o.default     = o.disabled
+o.cfgvalue    = function(...)
+    return Flag.cfgvalue(...) or "0"
+end
+
+---- skip cache
+o = s:taboption("seconddns", Flag, "seconddns_no_cache", translate("Skip Cache"), translate("Skip Cache."))
+o.rmempty     = false
+o.default     = o.disabled
+o.cfgvalue    = function(...)
+    return Flag.cfgvalue(...) or "0"
+end
+
 ----- custom settings
 custom = s:taboption("custom", Value, "Custom Settings",
 	translate(""), 
diff --git a/package/luci/files/luci/model/cbi/smartdns/upstream.lua b/package/luci/files/luci/model/cbi/smartdns/upstream.lua
index c564eb3..ad5f580 100644
--- a/package/luci/files/luci/model/cbi/smartdns/upstream.lua
+++ b/package/luci/files/luci/model/cbi/smartdns/upstream.lua
@@ -40,7 +40,7 @@ o.default     = "udp"
 o.rempty      = false
 
 ---- TLS host verify
-o = s:option(Value, "tls_host_verify", translate("TLS Hostname Verify"), translate("Set TLS hostname to verify"))
+o = s:option(Value, "tls_host_verify", translate("TLS Hostname Verify"), translate("Set TLS hostname to verify."))
 o.default     = ""
 o.datatype    = "string"
 o.rempty      = true
@@ -48,7 +48,7 @@ o:depends("type", "tls")
 o:depends("type", "https")
 
 ---- SNI host name
-o = s:option(Value, "host_name", translate("TLS SNI name"), translate("Sets the server name indication"))
+o = s:option(Value, "host_name", translate("TLS SNI name"), translate("Sets the server name indication for query."))
 o.default     = ""
 o.datatype    = "hostname"
 o.rempty      = true
@@ -63,7 +63,7 @@ o.rempty      = true
 o:depends("type", "https")
 
 ---- server group
-o = s:option(Value, "server_group", translate("Server Group"), translate("DNS Server group belongs to, used with nameserver, such as offlce, home."))
+o = s:option(Value, "server_group", translate("Server Group"), translate("DNS Server group belongs to, used with nameserver, such as office, home."))
 o.rmempty     = true
 o.placeholder = "default"
 o.datatype    = "hostname"
diff --git a/package/openwrt/files/etc/init.d/smartdns b/package/openwrt/files/etc/init.d/smartdns
index cdacc3b..18aef9a 100644
--- a/package/openwrt/files/etc/init.d/smartdns
+++ b/package/openwrt/files/etc/init.d/smartdns
@@ -233,7 +233,75 @@ load_server()
 	conf_append "$SERVER" "$DNS_ADDRESS $ADDITIONAL_ARGS $addition_arg"
 }
 
-load_service() {
+load_second_server() 
+{
+	local section="$1"
+	local ARGS=""
+	local ADDR=""
+
+	config_get_bool "seconddns_enabled" "$section" "seconddns_enabled" "0"
+	if [ "$seconddns_enabled" = "0" ]; then
+		return
+	fi
+
+	config_get "seconddns_port" "$section" "seconddns_port" "7053"
+
+	config_get_bool "seconddns_no_speed_check" "$section" "seconddns_no_speed_check" "0"
+	if [ "$seconddns_no_speed_check" = "1" ]; then
+		ARGS="$ARGS -no-speed-check"
+	fi
+
+	config_get "seconddns_server_group" "$section" "seconddns_server_group" ""
+	if [ ! -z "$seconddns_server_group" ]; then
+		ARGS="$ARGS -group $seconddns_server_group"
+	fi
+
+	config_get_bool "seconddns_no_rule_addr" "$section" "seconddns_no_rule_addr" "0"
+	if [ "$seconddns_no_rule_addr" = "1" ]; then
+		ARGS="$ARGS -no-rule-addr"
+	fi
+
+	config_get_bool "seconddns_no_rule_nameserver" "$section" "seconddns_no_rule_nameserver" "0"
+	if [ "$seconddns_no_rule_nameserver" = "1" ]; then
+		ARGS="$ARGS -no-rule-nameserver"
+	fi
+
+	config_get_bool "seconddns_no_rule_ipset" "$section" "seconddns_no_rule_ipset" "0"
+	if [ "$seconddns_no_rule_ipset" = "1" ]; then
+		ARGS="$ARGS -no-rule-ipset"
+	fi
+
+	config_get_bool "seconddns_no_rule_soa" "$section" "seconddns_no_rule_soa" "0"
+	if [ "$seconddns_no_rule_soa" = "1" ]; then
+		ARGS="$ARGS -no-rule-soa"
+	fi
+
+	config_get_bool "seconddns_no_dualstack_selection" "$section" "seconddns_no_dualstack_selection" "0"
+	if [ "$seconddns_no_dualstack_selection" = "1" ]; then
+		ARGS="$ARGS -no-dualstack-selection"
+	fi
+
+	config_get_bool "seconddns_no_cache" "$section" "seconddns_no_cache" "0"
+	if [ "$seconddns_no_cache" = "1" ]; then
+		ARGS="$ARGS -no-cache"
+	fi
+
+	config_get "ipv6_server" "$section" "ipv6_server" "1"
+	if [ "$ipv6_server" = "1" ]; then
+		ADDR="[::]"
+	else
+		ADDR=""
+	fi
+
+	conf_append "bind" "$ADDR:$seconddns_port $ARGS"
+	config_get_bool "seconddns_tcp_server" "$section" "seconddns_tcp_server" "1"
+	if [ "$seconddns_tcp_server" = "1" ]; then
+		conf_append "bind-tcp" "$ADDR:$seconddns_port $ARGS"
+	fi
+}
+
+load_service() 
+{
 	local section="$1"
 	args=""
 
@@ -352,6 +420,8 @@ load_service() {
 		set_forward_dnsmasq "$SMARTDNS_PORT"
 	fi
 
+	load_second_server $section
+
 	config_foreach load_server "server"
 
 	echo "conf-file $ADDRESS_CONF" >> $SMARTDNS_CONF_TMP
@@ -378,12 +448,14 @@ load_service() {
 	procd_close_instance
 }
 
-start_service() {
+start_service() 
+{
 	config_load "smartdns"
 	config_foreach load_service "smartdns"
 }
 
-reload_service(){
+reload_service()
+{
 	stop
 	start
 }
diff --git a/src/dns_client.c b/src/dns_client.c
index eef7d2d..22d81a9 100644
--- a/src/dns_client.c
+++ b/src/dns_client.c
@@ -16,6 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#define _GNU_SOURCE
 #include "dns_client.h"
 #include "atomic.h"
 #include "dns.h"
@@ -45,6 +46,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/epoll.h>
+#include <string.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/types.h>
diff --git a/src/dns_conf.c b/src/dns_conf.c
index cbf91f5..0a9b752 100644
--- a/src/dns_conf.c
+++ b/src/dns_conf.c
@@ -745,6 +745,7 @@ static int _config_speed_check_mode(void *data, int argc, char *argv[])
 	char *ptr;
 	int order = 0;
 	int port = 80;
+	int i = 0;
 
 	if (argc <= 1) {
 		return -1;
@@ -778,7 +779,7 @@ static int _config_speed_check_mode(void *data, int argc, char *argv[])
 			dns_conf_check_order.tcp_port = port;
 		} else if (strncmp(field, "none", sizeof("none")) == 0) {
 			dns_conf_check_order.order[order] = DOMAIN_CHECK_NONE;
-			for (int i = order + 1; i < DOMAIN_CHECK_NUM; i++) {
+			for (i = order + 1; i < DOMAIN_CHECK_NUM; i++) {
 				dns_conf_check_order.order[i] = DOMAIN_CHECK_NONE;
 			}