diff --git a/src/idempotency/client/client_channel.c b/src/idempotency/client/client_channel.c
index 822f008..6170d50 100644
--- a/src/idempotency/client/client_channel.c
+++ b/src/idempotency/client/client_channel.c
@@ -175,12 +175,19 @@ static struct fast_task_info *alloc_channel_task(IdempotencyClientChannel
         const char *server_ip, const uint16_t port, int *err_no)
 {
     struct fast_task_info *task;
+    SFAddressFamilyHandler *fh;
     SFNetworkHandler *handler;
 
-    if (comm_type == fc_comm_type_sock) {
-        handler = g_sf_context.handlers + SF_SOCKET_NETWORK_HANDLER_INDEX;
+    if (is_ipv6_addr(server_ip)) {
+        fh = g_sf_context.handlers + SF_IPV6_ADDRESS_FAMILY_INDEX;
     } else {
-        handler = g_sf_context.handlers + SF_RDMACM_NETWORK_HANDLER_INDEX;
+        fh = g_sf_context.handlers + SF_IPV4_ADDRESS_FAMILY_INDEX;
+    }
+
+    if (comm_type == fc_comm_type_sock) {
+        handler = fh->handlers + SF_SOCKET_NETWORK_HANDLER_INDEX;
+    } else {
+        handler = fh->handlers + SF_RDMACM_NETWORK_HANDLER_INDEX;
     }
     if ((task=sf_alloc_init_task(handler, -1)) == NULL) {
         *err_no = ENOMEM;
diff --git a/src/sf_connection_manager.c b/src/sf_connection_manager.c
index e7e35d0..b275cfe 100644
--- a/src/sf_connection_manager.c
+++ b/src/sf_connection_manager.c
@@ -521,7 +521,6 @@ int sf_connection_manager_init_ex(SFConnectionManager *cm,
         connect_done_callback, void *args, FCServerConfig *server_cfg,
         const bool bg_thread_enabled)
 {
-    const int socket_domain = AF_UNSPEC;
     struct {
         ConnectionExtraParams holder;
         ConnectionExtraParams *ptr;
@@ -553,8 +552,8 @@ int sf_connection_manager_init_ex(SFConnectionManager *cm,
         extra_params.ptr = &extra_params.holder;
     }
     if ((result=conn_pool_init_ex1(&cm->cpool, common_cfg->connect_timeout,
-                    max_count_per_entry, max_idle_time, socket_domain,
-                    htable_init_capacity, connect_done_callback, args,
+                    max_count_per_entry, max_idle_time, htable_init_capacity,
+                    connect_done_callback, args,
                     sf_cm_validate_connection_callback, cm,
                     sizeof(SFConnectionParameters),
                     extra_params.ptr)) != 0)
diff --git a/src/sf_global.c b/src/sf_global.c
index 4754bd3..acc22b5 100644
--- a/src/sf_global.c
+++ b/src/sf_global.c
@@ -30,6 +30,7 @@
 #include "fastcommon/common_define.h"
 #include "fastcommon/shared_func.h"
 #include "fastcommon/process_ctrl.h"
+#include "fastcommon/local_ip_func.h"
 #include "fastcommon/logger.h"
 #include "sf_nio.h"
 #include "sf_service.h"
@@ -46,22 +47,13 @@ SFGlobalVariables g_sf_global_vars = {
     {0, 0}, NULL, {NULL, 0}
 };
 
-SFContext g_sf_context = {{'\0'}, NULL, 0,
-    {{true, fc_comm_type_sock}, {false, fc_comm_type_rdma}},
-    1, DEFAULT_WORK_THREADS, {'\0'}, {'\0'}, 0, true, true, true,
-    {false, 0, 0}, {sf_task_finish_clean_up}
+SFContext g_sf_context = {{'\0'}, NULL, 0, sf_address_family_auto,
+    {{AF_UNSPEC, {{true, fc_comm_type_sock}, {false, fc_comm_type_rdma}}},
+        {AF_UNSPEC, {{true, fc_comm_type_sock}, {false, fc_comm_type_rdma}}}},
+    1, DEFAULT_WORK_THREADS, 0, true, true, true, {false, 0, 0},
+    {sf_task_finish_clean_up}
 };
 
-static inline void set_config_str_value(const char *value,
-        char *dest, const int dest_size)
-{
-    if (value == NULL) {
-        *dest = '\0';
-    } else {
-        snprintf(dest, dest_size, "%s", value);
-    }
-}
-
 static int load_network_parameters(IniFullContext *ini_ctx,
         const char *max_pkg_size_item_nm, const int fixed_buff_size,
         const int task_buffer_extra_size)
@@ -472,9 +464,9 @@ static int load_rdma_apis(SFNetworkHandler *handler)
 }
 
 static int init_network_handler(SFNetworkHandler *handler,
-        SFContext *sf_context)
+        SFAddressFamilyHandler *fh)
 {
-    handler->ctx = sf_context;
+    handler->fh = fh;
     handler->inner.handler = handler;
     handler->outer.handler = handler;
     handler->inner.is_inner = true;
@@ -501,83 +493,46 @@ static int init_network_handler(SFNetworkHandler *handler,
     }
 }
 
-int sf_load_context_from_config_ex(SFContext *sf_context,
+static void set_bind_address(const char *bind_addr, char *ipv4_bind_addr,
+        char *ipv6_bind_addr, const int addr_size)
+{
+    char new_bind_addr[2 * IP_ADDRESS_SIZE];
+    char *cols[2];
+    char *ip_addr;
+    int count;
+    int len;
+    int i;
+
+    if (bind_addr == NULL || *bind_addr == '\0') {
+        *ipv4_bind_addr = *ipv6_bind_addr = '\0';
+        return;
+    }
+
+    snprintf(new_bind_addr, sizeof(new_bind_addr), "%s", bind_addr);
+    count = splitEx(new_bind_addr, ',', cols, 2);
+    for (i=0; i<count; i++) {
+        ip_addr = cols[i];
+        if (is_ipv6_addr(ip_addr)) {
+            len = strlen(ip_addr);
+            if (*ip_addr == '[' && *(ip_addr + (len - 1)) == ']') {
+                ++ip_addr;
+                len -= 2;
+            }
+            snprintf(ipv6_bind_addr, addr_size, "%.*s", len, ip_addr);
+        } else {
+            snprintf(ipv4_bind_addr, addr_size, "%s", ip_addr);
+        }
+    }
+}
+
+static int load_bind_address(SFContext *sf_context,
         SFContextIniConfig *config)
 {
-    SFNetworkHandler *sock_handler;
-    SFNetworkHandler *rdma_handler;
-    char *inner_port;
-    char *outer_port;
     char *inner_bind_addr;
     char *outer_bind_addr;
     char *bind_addr;
-    int port;
-    int i;
-    int result;
-
-    sock_handler = sf_context->handlers + SF_SOCKET_NETWORK_HANDLER_INDEX;
-    rdma_handler = sf_context->handlers + SF_RDMACM_NETWORK_HANDLER_INDEX;
-    sock_handler->comm_type = fc_comm_type_sock;
-    rdma_handler->comm_type = fc_comm_type_rdma;
-    if (config->comm_type == fc_comm_type_sock) {
-        sock_handler->enabled = true;
-        rdma_handler->enabled = false;
-    } else if (config->comm_type == fc_comm_type_rdma) {
-        sock_handler->enabled = false;
-        rdma_handler->enabled = true;
-    } else if (config->comm_type == fc_comm_type_both) {
-        sock_handler->enabled = true;
-        rdma_handler->enabled = true;
-    }
-    for (i=0; i<SF_NETWORK_HANDLER_COUNT; i++) {
-        if (!sf_context->handlers[i].enabled) {
-            continue;
-        }
-        if ((result=init_network_handler(sf_context->handlers + i,
-                        sf_context)) != 0)
-        {
-            return result;
-        }
-    }
-
-    inner_port = iniGetStrValue(config->ini_ctx.section_name,
-            "inner_port", config->ini_ctx.context);
-    outer_port = iniGetStrValue(config->ini_ctx.section_name,
-            "outer_port", config->ini_ctx.context);
-    if (inner_port == NULL && outer_port == NULL) {
-        port = iniGetIntValue(config->ini_ctx.section_name,
-                "port", config->ini_ctx.context, 0);
-        if (port > 0) {
-            sock_handler->inner.port = sock_handler->outer.port = port;
-        }
-    } else {
-        if (inner_port != NULL) {
-            sock_handler->inner.port = strtol(inner_port, NULL, 10);
-        }
-        if (outer_port != NULL) {
-            sock_handler->outer.port = strtol(outer_port, NULL, 10);
-        }
-    }
-
-    if (sock_handler->inner.port <= 0) {
-        sock_handler->inner.port = config->default_inner_port;
-    }
-    if (sock_handler->outer.port <= 0) {
-        sock_handler->outer.port = config->default_outer_port;
-    }
-
-    if (sock_handler->inner.port == sock_handler->outer.port) {
-        sock_handler->inner.enabled = true;
-        sock_handler->outer.enabled = false;
-    } else {
-        sock_handler->inner.enabled = true;
-        sock_handler->outer.enabled = true;
-    }
-
-    rdma_handler->inner.port = sock_handler->inner.port;
-    rdma_handler->inner.enabled = sock_handler->inner.enabled;
-    rdma_handler->outer.port = sock_handler->outer.port;
-    rdma_handler->outer.enabled = sock_handler->outer.enabled;
+    SFAddressFamilyHandler *ipv4_handler;
+    SFAddressFamilyHandler *ipv6_handler;
 
     inner_bind_addr = iniGetStrValue(config->ini_ctx.section_name,
             "inner_bind_addr", config->ini_ctx.context);
@@ -590,10 +545,192 @@ int sf_load_context_from_config_ex(SFContext *sf_context,
             inner_bind_addr = outer_bind_addr = bind_addr;
         }
     }
-    set_config_str_value(inner_bind_addr, sf_context->inner_bind_addr,
-                sizeof(sf_context->inner_bind_addr));
-    set_config_str_value(outer_bind_addr, sf_context->outer_bind_addr,
-                sizeof(sf_context->outer_bind_addr));
+
+    ipv4_handler = sf_context->handlers + SF_IPV4_ADDRESS_FAMILY_INDEX;
+    ipv6_handler = sf_context->handlers + SF_IPV6_ADDRESS_FAMILY_INDEX;
+    set_bind_address(inner_bind_addr, ipv4_handler->inner_bind_addr,
+            ipv6_handler->inner_bind_addr,
+            sizeof(ipv4_handler->inner_bind_addr));
+    set_bind_address(outer_bind_addr, ipv4_handler->outer_bind_addr,
+            ipv6_handler->outer_bind_addr,
+            sizeof(ipv4_handler->outer_bind_addr));
+    return 0;
+}
+
+static int load_address_family(SFContext *sf_context,
+        SFContextIniConfig *config)
+{
+    char *address_family_str;
+    SFAddressFamily address_family;
+    SFAddressFamilyHandler *ipv4_handler;
+    SFAddressFamilyHandler *ipv6_handler;
+    bool ipv4_bound;
+    bool ipv6_bound;
+
+    address_family_str = iniGetStrValue(config->ini_ctx.section_name,
+            "address_family", config->ini_ctx.context);
+    if (address_family_str == NULL) {
+        sf_context->address_family = sf_address_family_auto;
+    } else if (strcasecmp(address_family_str, "auto") == 0) {
+        sf_context->address_family = sf_address_family_auto;
+    } else if (strcasecmp(address_family_str, "IPv4") == 0) {
+        sf_context->address_family = sf_address_family_ipv4;
+    } else if (strcasecmp(address_family_str, "IPv6") == 0) {
+        sf_context->address_family = sf_address_family_ipv6;
+    } else if (strcasecmp(address_family_str, "both") == 0) {
+        sf_context->address_family = sf_address_family_both;
+    } else {
+        logError("file: "__FILE__", line: %d, "
+                "config file: %s, section: %s, address_family: %s "
+                "is invalid!", __LINE__, config->ini_ctx.filename,
+                config->ini_ctx.section_name, address_family_str);
+        return EINVAL;
+    }
+
+    ipv4_handler = sf_context->handlers + SF_IPV4_ADDRESS_FAMILY_INDEX;
+    ipv6_handler = sf_context->handlers + SF_IPV6_ADDRESS_FAMILY_INDEX;
+    if (sf_context->address_family == sf_address_family_auto) {
+        ipv4_bound = (*ipv4_handler->inner_bind_addr != '\0' ||
+                *ipv4_handler->outer_bind_addr != '\0');
+        ipv6_bound = (*ipv6_handler->inner_bind_addr != '\0' ||
+                *ipv6_handler->outer_bind_addr != '\0');
+        if (ipv4_bound) {
+            if (ipv6_bound) {
+                address_family = sf_address_family_both;
+            } else {
+                address_family = sf_address_family_ipv4;
+            }
+        } else {
+            if (ipv6_bound) {
+                address_family = sf_address_family_ipv6;
+            } else {
+                int ipv4_count;
+                int ipv6_count;
+                stat_local_host_ip(&ipv4_count, &ipv6_count);
+                if (ipv4_count > 0) {
+                    address_family = sf_address_family_ipv4;
+                } else {
+                    address_family = sf_address_family_ipv6;
+                }
+            }
+        }
+    } else {
+        address_family = sf_context->address_family;
+    }
+
+    switch (address_family) {
+        case sf_address_family_ipv4:
+            ipv4_handler->af = AF_INET;
+            ipv6_handler->af = AF_UNSPEC;
+            break;
+        case sf_address_family_ipv6:
+            ipv4_handler->af = AF_UNSPEC;
+            ipv6_handler->af = AF_INET6;
+            break;
+        case sf_address_family_both:
+            ipv4_handler->af = AF_INET;
+            ipv6_handler->af = AF_INET6;
+            break;
+        default:
+            break;
+    }
+
+    return 0;
+}
+
+int sf_load_context_from_config_ex(SFContext *sf_context,
+        SFContextIniConfig *config)
+{
+    SFAddressFamilyHandler *fh;
+    SFNetworkHandler *sock_handler;
+    SFNetworkHandler *rdma_handler;
+    SFNetworkHandler *handler;
+    SFNetworkHandler *end;
+    char *inner_port_str;
+    char *outer_port_str;
+    int inner_port;
+    int outer_port;
+    int port;
+    int i;
+    int result;
+
+    inner_port_str = iniGetStrValue(config->ini_ctx.section_name,
+            "inner_port", config->ini_ctx.context);
+    outer_port_str = iniGetStrValue(config->ini_ctx.section_name,
+            "outer_port", config->ini_ctx.context);
+    if (inner_port_str == NULL && outer_port_str == NULL) {
+        port = iniGetIntValue(config->ini_ctx.section_name,
+                "port", config->ini_ctx.context, 0);
+        if (port > 0) {
+            inner_port = outer_port = port;
+        } else {
+            inner_port = outer_port = 0;
+        }
+    } else {
+        if (inner_port_str != NULL) {
+            inner_port = strtol(inner_port_str, NULL, 10);
+        } else {
+            inner_port = 0;
+        }
+
+        if (outer_port_str != NULL) {
+            outer_port = strtol(outer_port_str, NULL, 10);
+        } else {
+            outer_port = 0;
+        }
+    }
+
+    if (inner_port <= 0) {
+        inner_port = config->default_inner_port;
+    }
+    if (outer_port <= 0) {
+        outer_port = config->default_outer_port;
+    }
+
+    for (i=0; i<SF_ADDRESS_FAMILY_COUNT; i++) {
+        fh = sf_context->handlers + i;
+        fh->ctx = sf_context;
+        sock_handler = fh->handlers + SF_SOCKET_NETWORK_HANDLER_INDEX;
+        rdma_handler = fh->handlers + SF_RDMACM_NETWORK_HANDLER_INDEX;
+        sock_handler->comm_type = fc_comm_type_sock;
+        rdma_handler->comm_type = fc_comm_type_rdma;
+        if (config->comm_type == fc_comm_type_sock) {
+            sock_handler->enabled = true;
+            rdma_handler->enabled = false;
+        } else if (config->comm_type == fc_comm_type_rdma) {
+            sock_handler->enabled = false;
+            rdma_handler->enabled = true;
+        } else if (config->comm_type == fc_comm_type_both) {
+            sock_handler->enabled = true;
+            rdma_handler->enabled = true;
+        }
+
+        end = fh->handlers + SF_NETWORK_HANDLER_COUNT;
+        for (handler=fh->handlers; handler<end; handler++) {
+            if (!handler->enabled) {
+                continue;
+            }
+            if ((result=init_network_handler(handler, fh)) != 0) {
+                return result;
+            }
+        }
+
+        sock_handler->inner.port = inner_port;
+        sock_handler->outer.port = outer_port;
+        if (sock_handler->inner.port == sock_handler->outer.port) {
+            sock_handler->inner.enabled = true;
+            sock_handler->outer.enabled = false;
+        } else {
+            sock_handler->inner.enabled = true;
+            sock_handler->outer.enabled = true;
+        }
+
+        rdma_handler->inner.port = sock_handler->inner.port;
+        rdma_handler->inner.enabled = sock_handler->inner.enabled;
+        rdma_handler->outer.port = sock_handler->outer.port;
+        rdma_handler->outer.enabled = sock_handler->outer.enabled;
+
+    }
 
     sf_context->accept_threads = iniGetIntValue(
             config->ini_ctx.section_name,
@@ -619,51 +756,123 @@ int sf_load_context_from_config_ex(SFContext *sf_context,
         return EINVAL;
     }
 
+    if ((result=load_bind_address(sf_context, config)) != 0) {
+        return result;
+    }
+
+    if ((result=load_address_family(sf_context, config)) != 0) {
+        return result;
+    }
+
     return 0;
 }
 
 int sf_alloc_rdma_pd(SFContext *sf_context,
         FCAddressPtrArray *address_array)
 {
+    SFAddressFamilyHandler *fh;
     SFNetworkHandler *handler;
+    int i;
     int result;
 
-    handler = sf_context->handlers + SF_RDMACM_NETWORK_HANDLER_INDEX;
-    if (!handler->enabled) {
-        return 0;
+    for (i=0; i<SF_ADDRESS_FAMILY_COUNT; i++) {
+        fh = sf_context->handlers + i;
+        if (fh->af == AF_UNSPEC) {
+            continue;
+        }
+
+        handler = fh->handlers + SF_RDMACM_NETWORK_HANDLER_INDEX;
+        if (handler->enabled) {
+            if ((handler->pd=fc_alloc_rdma_pd(handler->alloc_pd,
+                            address_array, &result)) == NULL)
+            {
+                return result;
+            }
+        }
     }
 
-    handler->pd = fc_alloc_rdma_pd(handler->alloc_pd,
-            address_array, &result);
-    return result;
+    return 0;
+}
+
+static void combine_bind_addr(char *bind_addr, const char *ip_addr)
+{
+    char *p;
+
+    if (*bind_addr == '\0') {
+        p = bind_addr;
+    } else {
+        p = bind_addr + strlen(bind_addr);
+        *p++ = ',';
+    }
+
+    sprintf(p, "%s", ip_addr);
+}
+
+static const char *get_address_family_caption(
+        const SFAddressFamily address_family)
+{
+    switch (address_family) {
+        case sf_address_family_auto:
+            return "auto";
+        case sf_address_family_ipv4:
+            return "IPv4";
+        case sf_address_family_ipv6:
+            return "IPv6";
+        case sf_address_family_both:
+            return "both";
+        default:
+            return "unkown";
+    }
 }
 
 void sf_context_config_to_string(const SFContext *sf_context,
         char *output, const int size)
 {
+    const SFAddressFamilyHandler *fh;
     const SFNetworkHandler *sock_handler;
+    char inner_bind_addr[2 * IP_ADDRESS_SIZE + 2];
+    char outer_bind_addr[2 * IP_ADDRESS_SIZE + 2];
+    int i;
     int len;
 
-    sock_handler = sf_context->handlers + SF_SOCKET_NETWORK_HANDLER_INDEX;
+    *inner_bind_addr = '\0';
+    *outer_bind_addr = '\0';
+    sock_handler = NULL;
+    for (i=0; i<SF_ADDRESS_FAMILY_COUNT; i++) {
+        fh = sf_context->handlers + i;
+        if (fh->af == AF_UNSPEC) {
+            continue;
+        }
+
+        if (*(fh->inner_bind_addr) != '\0') {
+            combine_bind_addr(inner_bind_addr, fh->inner_bind_addr);
+        }
+        if (*(fh->outer_bind_addr) != '\0') {
+            combine_bind_addr(outer_bind_addr, fh->outer_bind_addr);
+        }
+
+        sock_handler = fh->handlers + SF_SOCKET_NETWORK_HANDLER_INDEX;
+    }
+
     len = 0;
     if ((sock_handler->inner.port == sock_handler->outer.port) &&
-            (strcmp(sf_context->inner_bind_addr,
-                    sf_context->outer_bind_addr) == 0))
+            (strcmp(inner_bind_addr, outer_bind_addr) == 0))
     {
         len += snprintf(output + len, size - len,
                 "port=%u, bind_addr=%s",
                 sock_handler->inner.port,
-                sf_context->inner_bind_addr);
+                inner_bind_addr);
     } else {
         len += snprintf(output + len, size - len,
                 "inner_port=%u, inner_bind_addr=%s, "
                 "outer_port=%u, outer_bind_addr=%s",
-                sock_handler->inner.port, sf_context->inner_bind_addr,
-                sock_handler->outer.port, sf_context->outer_bind_addr);
+                sock_handler->inner.port, inner_bind_addr,
+                sock_handler->outer.port, outer_bind_addr);
     }
 
     len += snprintf(output + len, size - len,
-            ", accept_threads=%d, work_threads=%d",
+            ", address_family=%s, accept_threads=%d, work_threads=%d",
+            get_address_family_caption(sf_context->address_family),
             sf_context->accept_threads, sf_context->work_threads);
 }
 
diff --git a/src/sf_global.h b/src/sf_global.h
index 00b17cd..693fb73 100644
--- a/src/sf_global.h
+++ b/src/sf_global.h
@@ -90,12 +90,24 @@ extern SFContext                 g_sf_context;
 #define SF_G_THREAD_STACK_SIZE   g_sf_global_vars.thread_stack_size
 #define SF_G_UP_TIME             g_sf_global_vars.up_time
 
-#define SF_G_SOCK_HANDLER        (g_sf_context.handlers + \
+#define SF_G_SOCK_HANDLER        (g_sf_context.handlers  \
+        [SF_IPV4_ADDRESS_FAMILY_INDEX].handlers + \
         SF_SOCKET_NETWORK_HANDLER_INDEX)
 #define SF_G_OUTER_PORT          SF_G_SOCK_HANDLER->outer.port
 #define SF_G_INNER_PORT          SF_G_SOCK_HANDLER->inner.port
-#define SF_G_OUTER_BIND_ADDR     g_sf_context.outer_bind_addr
-#define SF_G_INNER_BIND_ADDR     g_sf_context.inner_bind_addr
+#define SF_G_OUTER_BIND_ADDR4     g_sf_context.handlers  \
+        [SF_IPV4_ADDRESS_FAMILY_INDEX].outer_bind_addr
+#define SF_G_INNER_BIND_ADDR4     g_sf_context.handlers  \
+        [SF_IPV4_ADDRESS_FAMILY_INDEX].inner_bind_addr
+#define SF_G_OUTER_BIND_ADDR6     g_sf_context.handlers  \
+        [SF_IPV6_ADDRESS_FAMILY_INDEX].outer_bind_addr
+#define SF_G_INNER_BIND_ADDR6     g_sf_context.handlers  \
+        [SF_IPV6_ADDRESS_FAMILY_INDEX].inner_bind_addr
+
+#define SF_G_IPV4_ENABLED     (g_sf_context.handlers  \
+        [SF_IPV4_ADDRESS_FAMILY_INDEX].af == AF_INET)
+#define SF_G_IPV6_ENABLED     (g_sf_context.handlers  \
+        [SF_IPV6_ADDRESS_FAMILY_INDEX].af == AF_INET6)
 
 #define SF_G_ACCEPT_THREADS      g_sf_context.accept_threads
 #define SF_G_WORK_THREADS        g_sf_context.work_threads
@@ -115,6 +127,11 @@ extern SFContext                 g_sf_context;
 #define SF_ALIVE_THREAD_COUNT(sf_context)  sf_context.thread_count
 #define SF_THREAD_INDEX(sf_context, tdata) (int)(tdata - sf_context.thread_data)
 
+#define SF_IPV4_ENABLED(sf_context)   (sf_context.handlers  \
+        [SF_IPV4_ADDRESS_FAMILY_INDEX].af == AF_INET)
+#define SF_IPV6_ENABLED(sf_context)   (sf_context.handlers  \
+        [SF_IPV6_ADDRESS_FAMILY_INDEX].af == AF_INET6)
+
 #define SF_CHOWN_RETURN_ON_ERROR(path, current_uid, current_gid) \
     do { \
         if (g_sf_global_vars.run_by.inited && !(g_sf_global_vars.  \
diff --git a/src/sf_nio.h b/src/sf_nio.h
index 1841429..a989a2e 100644
--- a/src/sf_nio.h
+++ b/src/sf_nio.h
@@ -27,7 +27,7 @@
 #include "sf_types.h"
 #include "sf_global.h"
 
-#define SF_CTX  (task->handler->ctx)
+#define SF_CTX  (task->handler->fh->ctx)
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/src/sf_proto.c b/src/sf_proto.c
index 0350435..b2ab5cf 100644
--- a/src/sf_proto.c
+++ b/src/sf_proto.c
@@ -35,8 +35,8 @@ int sf_proto_set_body_length(struct fast_task_info *task)
         logError("file: "__FILE__", line: %d, "
                 "%s peer %s:%u, magic "SF_PROTO_MAGIC_FORMAT" is invalid, "
                 "expect: "SF_PROTO_MAGIC_FORMAT", cmd: %d, body length: %d",
-                __LINE__, (task->handler != NULL ? task->handler->ctx->name :
-                    ""), task->client_ip, task->port,
+                __LINE__, (task->handler != NULL ? task->handler->fh->ctx->
+                    name : ""), task->client_ip, task->port,
                 SF_PROTO_MAGIC_PARAMS(header->magic),
                 SF_PROTO_MAGIC_EXPECT_PARAMS, header->cmd,
                 buff2int(header->body_len));
diff --git a/src/sf_service.c b/src/sf_service.c
index 184cc68..de48e7b 100644
--- a/src/sf_service.c
+++ b/src/sf_service.c
@@ -115,6 +115,7 @@ int sf_service_init_ex2(SFContext *sf_context, const char *name,
     int result;
     int bytes;
     int extra_events;
+    int i;
     struct worker_thread_context *thread_contexts;
     struct worker_thread_context *thread_ctx;
     struct nio_thread_data *thread_data;
@@ -132,8 +133,10 @@ int sf_service_init_ex2(SFContext *sf_context, const char *name,
             send_done_callback, deal_func, task_cleanup_func,
             timeout_callback, release_buffer_callback);
     if (explicit_post_recv) {
-        sf_context->handlers[SF_RDMACM_NETWORK_HANDLER_INDEX].
-            explicit_post_recv = true;
+        for (i=0; i<SF_ADDRESS_FAMILY_COUNT; i++) {
+            sf_context->handlers[i].handlers[SF_RDMACM_NETWORK_HANDLER_INDEX].
+                explicit_post_recv = true;
+        }
     }
 
     if ((result=sf_init_free_queue(&sf_context->free_queue,
@@ -350,28 +353,8 @@ int sf_socket_create_server(SFListener *listener,
 {
     int result;
 
-    if (af == AF_UNSPEC) {
-        if (bind_addr == NULL || *bind_addr == '\0') {
-            // 如果当前服务不存在IPv4地址，但是存在IPv6地址，则自动绑定IPv6地址
-            if (!checkHostHasIPv4Addr() && checkHostHasIPv6Addr()) {
-                listener->sock = socketServerIPv6(bind_addr,
-                        listener->port, &result);
-            } else {
-                listener->sock = socketServer(bind_addr,
-                        listener->port, &result);
-            }
-        } else if (is_ipv6_addr(bind_addr)) {
-            listener->sock = socketServerIPv6(bind_addr,
-                    listener->port, &result);
-        } else {
-            listener->sock = socketServer(bind_addr,
-                    listener->port, &result);
-        }
-    } else {
-        listener->sock = socketServer2(af, bind_addr,
-                listener->port, &result);
-    }
-
+    listener->sock = socketServer2(af, bind_addr,
+            listener->port, &result);
     if (listener->sock < 0) {
         return result;
     }
@@ -386,80 +369,90 @@ int sf_socket_create_server(SFListener *listener,
 int sf_socket_server_ex(SFContext *sf_context)
 {
     int result;
-    int af = AF_UNSPEC;
+    int i;
     bool dual_ports;
     const char *bind_addr;
+    SFAddressFamilyHandler *fh;
     SFNetworkHandler *handler;
     SFNetworkHandler *end;
 
-    end = sf_context->handlers + SF_NETWORK_HANDLER_COUNT;
-    for (handler=sf_context->handlers; handler<end; handler++) {
-        if (!handler->enabled) {
+    for (i=0; i<SF_ADDRESS_FAMILY_COUNT; i++) {
+        fh = sf_context->handlers + i;
+        if (fh->af == AF_UNSPEC) {
             continue;
         }
 
-        handler->inner.enabled = false;
-        handler->outer.enabled = false;
-        if (handler->outer.port == handler->inner.port) {
-            if (*sf_context->outer_bind_addr == '\0' ||
-                    *sf_context->inner_bind_addr == '\0') {
-                bind_addr = "";
-                if ((result=handler->create_server(&handler->
-                                outer, af, bind_addr)) != 0)
+        end = fh->handlers + SF_NETWORK_HANDLER_COUNT;
+        for (handler=fh->handlers; handler<end; handler++) {
+            if (!handler->enabled) {
+                continue;
+            }
+
+            handler->inner.enabled = false;
+            handler->outer.enabled = false;
+            if (handler->outer.port == handler->inner.port) {
+                if (*fh->outer_bind_addr == '\0' ||
+                        *fh->inner_bind_addr == '\0')
                 {
-                    return result;
-                }
-                handler->outer.enabled = true;
-                dual_ports = false;
-            } else if (strcmp(sf_context->outer_bind_addr,
-                        sf_context->inner_bind_addr) == 0) {
-                bind_addr = sf_context->outer_bind_addr;
-                if (is_private_ip(bind_addr)) {
+                    bind_addr = "";
                     if ((result=handler->create_server(&handler->
-                                    inner, af, bind_addr)) != 0)
-                    {
-                        return result;
-                    }
-                    handler->inner.enabled = true;
-                } else {
-                    if ((result=handler->create_server(&handler->
-                                    outer, af, bind_addr)) != 0)
+                                    outer, fh->af, bind_addr)) != 0)
                     {
                         return result;
                     }
                     handler->outer.enabled = true;
+                    dual_ports = false;
+                } else if (strcmp(fh->outer_bind_addr,
+                            fh->inner_bind_addr) == 0)
+                {
+                    bind_addr = fh->outer_bind_addr;
+                    if (is_private_ip(bind_addr)) {
+                        if ((result=handler->create_server(&handler->
+                                        inner, fh->af, bind_addr)) != 0)
+                        {
+                            return result;
+                        }
+                        handler->inner.enabled = true;
+                    } else {
+                        if ((result=handler->create_server(&handler->
+                                        outer, fh->af, bind_addr)) != 0)
+                        {
+                            return result;
+                        }
+                        handler->outer.enabled = true;
+                    }
+                    dual_ports = false;
+                } else {
+                    dual_ports = true;
                 }
-                dual_ports = false;
             } else {
                 dual_ports = true;
             }
-        } else {
-            dual_ports = true;
-        }
 
-        if (dual_ports) {
-            if ((result=handler->create_server(&handler->outer, af,
-                            sf_context->outer_bind_addr)) != 0)
-            {
-                return result;
+            if (dual_ports) {
+                if ((result=handler->create_server(&handler->outer,
+                                fh->af, fh->outer_bind_addr)) != 0)
+                {
+                    return result;
+                }
+
+                if ((result=handler->create_server(&handler->inner,
+                                fh->af, fh->inner_bind_addr)) != 0)
+                {
+                    return result;
+                }
+                handler->inner.enabled = true;
+                handler->outer.enabled = true;
             }
 
-            if ((result=handler->create_server(&handler->inner, af,
-                            sf_context->inner_bind_addr)) != 0)
-            {
-                return result;
-            }
-            handler->inner.enabled = true;
-            handler->outer.enabled = true;
+            /*
+               logInfo("%p [%d] inner {port: %d, enabled: %d}, "
+               "outer {port: %d, enabled: %d}", sf_context,
+               (int)(handler-sf_context->handlers),
+               handler->inner.port, handler->inner.enabled,
+               handler->outer.port, handler->outer.enabled);
+             */
         }
-
-        /*
-        logInfo("%p [%d] inner {port: %d, enabled: %d}, "
-                "outer {port: %d, enabled: %d}", sf_context,
-                (int)(handler-sf_context->handlers),
-                handler->inner.port, handler->inner.enabled,
-                handler->outer.port, handler->outer.enabled);
-                */
     }
 
     return 0;
@@ -518,19 +511,27 @@ void sf_socket_close_connection(struct fast_task_info *task)
 
 void sf_socket_close_ex(SFContext *sf_context)
 {
+    int i;
     SFNetworkHandler *handler;
     SFNetworkHandler *end;
 
-    end = sf_context->handlers + SF_NETWORK_HANDLER_COUNT;
-    for (handler=sf_context->handlers; handler<end; handler++) {
-        if (!handler->enabled) {
+    for (i=0; i<SF_ADDRESS_FAMILY_COUNT; i++) {
+        if (sf_context->handlers[i].af == AF_UNSPEC) {
             continue;
         }
-        if (handler->outer.enabled) {
-            handler->close_server(&handler->outer);
-        }
-        if (handler->inner.enabled) {
-            handler->close_server(&handler->inner);
+
+        end = sf_context->handlers[i].handlers + SF_NETWORK_HANDLER_COUNT;
+        for (handler=sf_context->handlers[i].handlers; handler<end; handler++) {
+            if (!handler->enabled) {
+                continue;
+            }
+
+            if (handler->outer.enabled) {
+                handler->close_server(&handler->outer);
+            }
+            if (handler->inner.enabled) {
+                handler->close_server(&handler->inner);
+            }
         }
     }
 }
@@ -544,10 +545,10 @@ static void accept_run(SFListener *listener)
             continue;
         }
 
-        task->thread_data = listener->handler->ctx->thread_data +
-            task->event.fd % listener->handler->ctx->work_threads;
-        if (listener->handler->ctx->callbacks.accept_done != NULL) {
-            if (listener->handler->ctx->callbacks.accept_done(task,
+        task->thread_data = listener->handler->fh->ctx->thread_data +
+            task->event.fd % listener->handler->fh->ctx->work_threads;
+        if (listener->handler->fh->ctx->callbacks.accept_done != NULL) {
+            if (listener->handler->fh->ctx->callbacks.accept_done(task,
                         listener->inaddr.sin_addr.s_addr,
                         listener->is_inner) != 0)
             {
@@ -571,7 +572,7 @@ static void *accept_thread_entrance(SFListener *listener)
         char thread_name[32];
         snprintf(thread_name, sizeof(thread_name), "%s-%s-listen",
                 listener->handler->comm_type == fc_comm_type_sock ?
-                "sock" : "rdma", listener->handler->ctx->name);
+                "sock" : "rdma", listener->handler->fh->ctx->name);
         prctl(PR_SET_NAME, thread_name);
     }
 #endif
@@ -618,25 +619,35 @@ int _accept_loop(SFListener *listener, const int accept_threads)
 
 int sf_accept_loop_ex(SFContext *sf_context, const bool blocked)
 {
+    int i;
     SFNetworkHandler *handler;
     SFNetworkHandler *hend;
-    SFListener *listeners[SF_NETWORK_HANDLER_COUNT * 2];
+    SFListener *listeners[SF_ADDRESS_FAMILY_COUNT *
+        SF_NETWORK_HANDLER_COUNT * 2];
     SFListener **listener;
     SFListener **last;
     SFListener **lend;
 
     listener = listeners;
-    hend = sf_context->handlers + SF_NETWORK_HANDLER_COUNT;
-    for (handler=sf_context->handlers; handler<hend; handler++) {
-        if (!handler->enabled) {
+    for (i=0; i<SF_ADDRESS_FAMILY_COUNT; i++) {
+        if (sf_context->handlers[i].af == AF_UNSPEC) {
             continue;
         }
 
-        if (handler->inner.enabled) {
-            *listener++ = &handler->inner;
-        }
-        if (handler->outer.enabled) {
-            *listener++ = &handler->outer;
+        hend = sf_context->handlers[i].handlers + SF_NETWORK_HANDLER_COUNT;
+        for (handler=sf_context->handlers[i].handlers;
+                handler<hend; handler++)
+        {
+            if (!handler->enabled) {
+                continue;
+            }
+
+            if (handler->inner.enabled) {
+                *listener++ = &handler->inner;
+            }
+            if (handler->outer.enabled) {
+                *listener++ = &handler->outer;
+            }
         }
     }
 
@@ -862,59 +873,3 @@ void sf_set_sig_quit_handler(sf_sig_quit_handler quit_handler)
 {
     sig_quit_handler = quit_handler;
 }
-
-// 判断当前服务器是否存在IPv4地址
-bool checkHostHasIPv4Addr()
-{
-    struct ifaddrs *ifaddr, *ifa;
-    bool hasIPv4;
-
-    if (getifaddrs(&ifaddr) == -1) {
-        return false;
-    }
-
-    hasIPv4 = false;
-    for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
-        if (ifa->ifa_addr == NULL) {
-            continue;
-        }
-        if (strcmp(ifa->ifa_name, "lo") == 0) { // 排除lo接口
-            continue;
-        }
-        if (ifa->ifa_addr->sa_family == AF_INET) {
-            hasIPv4 = true;
-            break;
-        }
-    }
-
-    freeifaddrs(ifaddr);
-    return hasIPv4;
-}
-
-// 判断当前服务器是否存在IPv6地址
-bool checkHostHasIPv6Addr()
-{
-    struct ifaddrs *ifaddr, *ifa;
-    bool hasIPv6;
-
-    if (getifaddrs(&ifaddr) == -1) {
-        return false;
-    }
-
-    hasIPv6 = false;
-    for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
-        if (ifa->ifa_addr == NULL) {
-            continue;
-        }
-        if (strcmp(ifa->ifa_name, "lo") == 0) { // 排除lo接口
-            continue;
-        }
-        if (ifa->ifa_addr->sa_family == AF_INET6) {
-            hasIPv6 = true;
-            break;
-        }
-    }
-
-    freeifaddrs(ifaddr);
-    return hasIPv6;
-}
diff --git a/src/sf_service.h b/src/sf_service.h
index dd2b428..1e885f3 100644
--- a/src/sf_service.h
+++ b/src/sf_service.h
@@ -156,7 +156,7 @@ static inline struct fast_task_info *sf_alloc_init_task_ex(
 {
     struct fast_task_info *task;
 
-    task = free_queue_pop(&handler->ctx->free_queue);
+    task = free_queue_pop(&handler->fh->ctx->free_queue);
     if (task == NULL) {
         logError("file: "__FILE__", line: %d, "
                 "malloc task buff failed, you should "
@@ -190,22 +190,23 @@ static inline void sf_release_task(struct fast_task_info *task)
     }
 }
 
-// 判断当前服务器是否存在IPv4地址
-bool checkHostHasIPv4Addr();
-
-// 判断当前服务器是否存在IPv6地址
-bool checkHostHasIPv6Addr();
-
 static inline SFNetworkHandler *sf_get_first_network_handler_ex(
         SFContext *sf_context)
 {
+    int i;
     SFNetworkHandler *handler;
     SFNetworkHandler *end;
 
-    end = sf_context->handlers + SF_NETWORK_HANDLER_COUNT;
-    for (handler=sf_context->handlers; handler<end; handler++) {
-        if (handler->enabled) {
-            return handler;
+    for (i=0; i<SF_ADDRESS_FAMILY_COUNT; i++) {
+        if (sf_context->handlers[i].af == AF_UNSPEC) {
+            continue;
+        }
+
+        end = sf_context->handlers[i].handlers + SF_NETWORK_HANDLER_COUNT;
+        for (handler=sf_context->handlers[i].handlers; handler<end; handler++) {
+            if (handler->enabled) {
+                return handler;
+            }
         }
     }
 
@@ -218,10 +219,20 @@ static inline SFNetworkHandler *sf_get_first_network_handler_ex(
 static inline SFNetworkHandler *sf_get_rdma_network_handler(
         SFContext *sf_context)
 {
+    int i;
     SFNetworkHandler *handler;
 
-    handler = sf_context->handlers + SF_RDMACM_NETWORK_HANDLER_INDEX;
-    return (handler->enabled ? handler : NULL);
+    for (i=0; i<SF_ADDRESS_FAMILY_COUNT; i++) {
+        if (sf_context->handlers[i].af != AF_UNSPEC) {
+            handler = sf_context->handlers[i].handlers +
+                SF_RDMACM_NETWORK_HANDLER_INDEX;
+            if (handler->enabled) {
+                return handler;
+            }
+        }
+    }
+
+    return NULL;
 }
 
 static inline SFNetworkHandler *sf_get_rdma_network_handler2(
diff --git a/src/sf_types.h b/src/sf_types.h
index 32f427a..d27d9a5 100644
--- a/src/sf_types.h
+++ b/src/sf_types.h
@@ -34,6 +34,10 @@
 #define SF_SERVER_TASK_TYPE_CHANNEL_HOLDER     101   //for request idempotency
 #define SF_SERVER_TASK_TYPE_CHANNEL_USER       102   //for request idempotency
 
+#define SF_ADDRESS_FAMILY_COUNT           2
+#define SF_IPV4_ADDRESS_FAMILY_INDEX      0
+#define SF_IPV6_ADDRESS_FAMILY_INDEX      1
+
 #define SF_NETWORK_HANDLER_COUNT          2
 #define SF_SOCKET_NETWORK_HANDLER_INDEX   0
 #define SF_RDMACM_NETWORK_HANDLER_INDEX   1
@@ -61,6 +65,13 @@ typedef enum {
     sf_comm_action_finish = 'f'
 } SFCommAction;
 
+typedef enum {
+    sf_address_family_auto = 0,
+    sf_address_family_ipv4 = 1,
+    sf_address_family_ipv6 = 2,
+    sf_address_family_both = 3
+} SFAddressFamily;
+
 struct ibv_pd;
 struct sf_listener;
 
@@ -98,11 +109,12 @@ typedef struct sf_listener {
 } SFListener;
 
 struct sf_context;
+struct sf_address_family_handler;
 typedef struct sf_network_handler {
     bool enabled;
     bool explicit_post_recv;
     FCCommunicationType comm_type;
-    struct sf_context *ctx;
+    struct sf_address_family_handler *fh;
     struct ibv_pd *pd;
 
     SFListener inner;
@@ -140,20 +152,26 @@ typedef struct sf_nio_callbacks {
     sf_release_buffer_callback release_buffer;
 } SFNIOCallbacks;
 
+typedef struct sf_address_family_handler {
+    int af;   //AF_UNSPEC for disabled
+    SFNetworkHandler handlers[SF_NETWORK_HANDLER_COUNT];
+    char inner_bind_addr[IP_ADDRESS_SIZE];
+    char outer_bind_addr[IP_ADDRESS_SIZE];
+    struct sf_context *ctx;
+} SFAddressFamilyHandler;
+
 typedef struct sf_context {
     char name[64];
     struct nio_thread_data *thread_data;
     volatile int thread_count;
 
     //int rdma_port_offset;
-    SFNetworkHandler handlers[SF_NETWORK_HANDLER_COUNT];
+    SFAddressFamily address_family;
+    SFAddressFamilyHandler handlers[SF_ADDRESS_FAMILY_COUNT];
 
     int accept_threads;
     int work_threads;
 
-    char inner_bind_addr[IP_ADDRESS_SIZE];
-    char outer_bind_addr[IP_ADDRESS_SIZE];
-
     int header_size;
     bool remove_from_ready_list;
     bool realloc_task_buffer;