diff --git a/include/applet/dnsproxy.h b/include/applet/dnsproxy.h
index 81a26e7..6a8bce8 100644
--- a/include/applet/dnsproxy.h
+++ b/include/applet/dnsproxy.h
@@ -7,6 +7,7 @@
 typedef struct {
     uint16_t port;
     uint32_t cache;
+    uint8_t ipv6; // bool value
     uint8_t debug; // bool value
     uint8_t verify; // bool value
     uint8_t parallel; // bool value
diff --git a/include/loader/config.h b/include/loader/config.h
index d0c5f33..2a2f9bc 100644
--- a/include/loader/config.h
+++ b/include/loader/config.h
@@ -5,6 +5,7 @@
 
 typedef struct {
     uint16_t port;
+    uint8_t ipv6; // bool value
     uint8_t verify; // bool value
     uint8_t parallel; // bool value
     char **bootstrap;
diff --git a/src/applet/dnsproxy.c b/src/applet/dnsproxy.c
index 593b4b2..4b86264 100644
--- a/src/applet/dnsproxy.c
+++ b/src/applet/dnsproxy.c
@@ -21,6 +21,7 @@ dnsproxy* dnsproxy_init(uint16_t port) { // init dnsproxy options
     dnsproxy *info = (dnsproxy *)malloc(sizeof(dnsproxy));
     info->port = port;
     info->cache = 0; // disable cache in default
+    info->ipv6 = TRUE;
     info->debug = FALSE;
     info->verify = TRUE;
     info->parallel = TRUE;
@@ -35,6 +36,7 @@ void dnsproxy_dump(const char *caption, dnsproxy *info) { // show dnsproxy optio
     char *str_dump;
     log_debug("%s port -> %u", caption, info->port);
     log_debug("%s cache -> %u", caption, info->cache);
+    log_debug("%s ipv6 -> %s", caption, show_bool(info->ipv6));
     log_debug("%s debug -> %s", caption, show_bool(info->debug));
     log_debug("%s verify -> %s", caption, show_bool(info->verify));
     log_debug("%s parallel -> %s", caption, show_bool(info->parallel));
@@ -94,6 +96,8 @@ char* dnsproxy_config(dnsproxy *info) { // generate json configure from dnsproxy
     if (info->optimistic) {
         cJSON_AddTrueToObject(config, "cache-optimistic"); // cache-optimistic --(default)--> `false`
     }
+    // TODO: load ipv6 option
+    log_warn("TODO: load ipv6 option");
 
     cJSON *port = cJSON_CreateArray();
     cJSON_AddItemToArray(port, cJSON_CreateNumber(info->port));
diff --git a/src/loader/config.c b/src/loader/config.c
index e5b3117..f462337 100644
--- a/src/loader/config.c
+++ b/src/loader/config.c
@@ -14,6 +14,7 @@ cleardns_config* config_init() { // init config struct of cleardns
     config->cache.optimistic = FALSE;
 
     config->domestic.port = DOMESTIC_PORT;
+    config->domestic.ipv6 = TRUE;
     config->domestic.verify = TRUE;
     config->domestic.parallel = TRUE;
     config->domestic.bootstrap = string_list_init();
@@ -21,6 +22,7 @@ cleardns_config* config_init() { // init config struct of cleardns
     config->domestic.primary = string_list_init();
 
     config->foreign.port = FOREIGN_PORT;
+    config->foreign.ipv6 = TRUE;
     config->foreign.verify = TRUE;
     config->foreign.parallel = TRUE;
     config->foreign.bootstrap = string_list_init();
@@ -56,6 +58,7 @@ void config_dump(cleardns_config *config) { // dump config info of cleardns
     log_debug("Cache optimistic -> %s", show_bool(config->cache.optimistic));
 
     log_debug("Domestic port -> %u", config->domestic.port);
+    log_debug("Domestic ipv6 -> %s", show_bool(config->domestic.ipv6));
     log_debug("Domestic verify -> %s", show_bool(config->domestic.verify));
     log_debug("Domestic parallel -> %s", show_bool(config->domestic.parallel));
     string_list_debug("Domestic bootstrap", config->domestic.bootstrap);
@@ -63,6 +66,7 @@ void config_dump(cleardns_config *config) { // dump config info of cleardns
     string_list_debug("Domestic primary", config->domestic.primary);
 
     log_debug("Foreign port -> %u", config->foreign.port);
+    log_debug("Foreign ipv6 -> %s", show_bool(config->foreign.ipv6));
     log_debug("Foreign verify -> %s", show_bool(config->foreign.verify));
     log_debug("Foreign parallel -> %s", show_bool(config->foreign.parallel));
     string_list_debug("Foreign bootstrap", config->foreign.bootstrap);
diff --git a/src/loader/loader.c b/src/loader/loader.c
index 6914654..09b3bd2 100644
--- a/src/loader/loader.c
+++ b/src/loader/loader.c
@@ -29,6 +29,7 @@ void load_diverter_assets() {
 
 dnsproxy* load_domestic(cleardns_config *config) {
     dnsproxy *domestic = dnsproxy_init(config->domestic.port);
+    domestic->ipv6 = config->domestic.ipv6;
     domestic->verify = config->domestic.verify;
     domestic->parallel = config->domestic.parallel;
     if (config->cache.enable) {
@@ -43,6 +44,7 @@ dnsproxy* load_domestic(cleardns_config *config) {
 
 dnsproxy* load_foreign(cleardns_config *config) {
     dnsproxy *foreign = dnsproxy_init(config->foreign.port);
+    foreign->ipv6 = config->foreign.ipv6;
     foreign->verify = config->foreign.verify;
     foreign->parallel = config->foreign.parallel;
     if (config->cache.enable) {
diff --git a/src/loader/parser.c b/src/loader/parser.c
index b03c657..ca8d9d7 100644
--- a/src/loader/parser.c
+++ b/src/loader/parser.c
@@ -37,6 +37,11 @@ void upstream_parser(char *caption, upstream_config *config, cJSON *json) { // u
             config->port = json_int_value(key_name, json);
             free(key_name);
         }
+        if (!strcmp(json->string, "ipv6")) {
+            key_name = string_join(caption, ".ipv6");
+            config->ipv6 = json_bool_value(key_name, json);
+            free(key_name);
+        }
         if (!strcmp(json->string, "verify")) {
             key_name = string_join(caption, ".verify");
             config->verify = json_bool_value(key_name, json);