diff --git a/doc/shadowsocks-libev.asciidoc b/doc/shadowsocks-libev.asciidoc
index f97aeb9f..13cddc87 100644
--- a/doc/shadowsocks-libev.asciidoc
+++ b/doc/shadowsocks-libev.asciidoc
@@ -103,10 +103,10 @@ Not available in redir mode.
 -b <local_address>::
 Specify the local address to bind.
 +
-For servers: Specify the local address to use while this server is making 
+For servers: Specify the local address to use while this server is making
 outbound connections to remote servers on behalf of the clients.
 +
-For clients: Specify the local address to use while this client is making 
+For clients: Specify the local address to use while this client is making
 outbound connections to the server.
 +
 Not available in manager mode.
@@ -178,6 +178,8 @@ The config file equivalent of command line options is listed as example below.
 | -s some.server.net -p 1234 (client) | "server": "some.server.net:1234"
 | -p 1234                             | "server_port": "1234"
 | -b 0.0.0.0                          | "local_address": "0.0.0.0"
+| -b 10.0.0.2                         | "local_ipv4_address": "10.0.0.2"
+| -b 2620:129:35::33                  | "local_ipv6_address": "2620:129:35::33"
 | -l 4321                             | "local_port": "4321"
 | -k "PasSworD"                       | "password": "PasSworD"
 | -m "aes-256-cfb"                    | "method": "aes-256-cfb"
diff --git a/src/jconf.c b/src/jconf.c
index 2335d443..b843104b 100644
--- a/src/jconf.c
+++ b/src/jconf.c
@@ -241,6 +241,10 @@ read_jconf(const char *file)
                 conf.remote_port = to_string(value);
             } else if (strcmp(name, "local_address") == 0) {
                 conf.local_addr = to_string(value);
+            } else if (strcmp(name, "local_ipv4_address") == 0) {
+                conf.local_addr_v4 = to_string(value);
+            } else if (strcmp(name, "local_ipv6_address") == 0) {
+                conf.local_addr_v6 = to_string(value);
             } else if (strcmp(name, "local_port") == 0) {
                 conf.local_port = to_string(value);
             } else if (strcmp(name, "password") == 0) {
diff --git a/src/jconf.h b/src/jconf.h
index a003b5c4..9a2209b5 100644
--- a/src/jconf.h
+++ b/src/jconf.h
@@ -60,6 +60,8 @@ typedef struct {
     ss_port_password_t port_password[MAX_PORT_NUM];
     char *remote_port;
     char *local_addr;
+    char *local_addr_v4;
+    char *local_addr_v6;
     char *local_port;
     char *password;
     char *key;
diff --git a/src/netutils.c b/src/netutils.c
index 2eb1edc9..895ea753 100644
--- a/src/netutils.c
+++ b/src/netutils.c
@@ -86,32 +86,45 @@ setinterface(int socket_fd, const char *interface_name)
 #endif
 
 int
-bind_to_address(int socket_fd, const char *host)
+parse_local_addr(struct sockaddr_storage *storage_v4,
+                 struct sockaddr_storage *storage_v6,
+                 const char *host)
 {
-    static struct sockaddr_storage storage = { 0 };
-    if (storage.ss_family == AF_INET) {
-        return bind(socket_fd, (struct sockaddr *)&storage, sizeof(struct sockaddr_in));
-    } else if (storage.ss_family == AF_INET6) {
-        return bind(socket_fd, (struct sockaddr *)&storage, sizeof(struct sockaddr_in6));
-    } else if (host != NULL) {
+    if (host != NULL) {
         struct cork_ip ip;
         if (cork_ip_init(&ip, host) != -1) {
             if (ip.version == 4) {
-                struct sockaddr_in *addr = (struct sockaddr_in *)&storage;
+                memset(storage_v4, 0, sizeof(struct sockaddr_storage));
+                struct sockaddr_in *addr = (struct sockaddr_in *)storage_v4;
                 inet_pton(AF_INET, host, &addr->sin_addr);
                 addr->sin_family = AF_INET;
-                return bind(socket_fd, (struct sockaddr *)addr, sizeof(struct sockaddr_in));
+                LOGI("binding to outbound IPv4 addr: %s", host);
+                return 0;
             } else if (ip.version == 6) {
-                struct sockaddr_in6 *addr = (struct sockaddr_in6 *)&storage;
+                memset(storage_v6, 0, sizeof(struct sockaddr_storage));
+                struct sockaddr_in6 *addr = (struct sockaddr_in6 *)storage_v6;
                 inet_pton(AF_INET6, host, &addr->sin6_addr);
                 addr->sin6_family = AF_INET6;
-                return bind(socket_fd, (struct sockaddr *)addr, sizeof(struct sockaddr_in6));
+                LOGI("binding to outbound IPv6 addr: %s", host);
+                return 0;
             }
         }
     }
     return -1;
 }
 
+int
+bind_to_addr(struct sockaddr_storage *storage,
+             int socket_fd)
+{
+    if (storage->ss_family == AF_INET) {
+        return bind(socket_fd, (struct sockaddr *)storage, sizeof(struct sockaddr_in));
+    } else if (storage->ss_family == AF_INET6) {
+        return bind(socket_fd, (struct sockaddr *)storage, sizeof(struct sockaddr_in6));
+    }
+    return -1;
+}
+
 ssize_t
 get_sockaddr(char *host, char *port,
              struct sockaddr_storage *storage, int block,
diff --git a/src/netutils.h b/src/netutils.h
index a4b19884..ee62317e 100644
--- a/src/netutils.h
+++ b/src/netutils.h
@@ -88,7 +88,11 @@ int set_reuseport(int socket);
 int setinterface(int socket_fd, const char *interface_name);
 #endif
 
-int bind_to_address(int socket_fd, const char *address);
+int parse_local_addr(struct sockaddr_storage *storage_v4,
+                     struct sockaddr_storage *storage_v6,
+                     const char *host);
+
+int bind_to_addr(struct sockaddr_storage *storage, int socket_fd);
 
 /**
  * Compare two sockaddrs. Imposes an ordering on the addresses.
diff --git a/src/server.c b/src/server.c
index 38d3a9f4..21ec535a 100644
--- a/src/server.c
+++ b/src/server.c
@@ -109,7 +109,10 @@ static void resolv_free_cb(void *data);
 
 int verbose      = 0;
 int reuse_port   = 0;
-char *local_addr = NULL;
+
+int is_bind_local_addr = 0;
+struct sockaddr_storage local_addr_v4;
+struct sockaddr_storage local_addr_v6;
 
 static crypto_t *crypto;
 
@@ -496,12 +499,16 @@ connect_to_remote(EV_P_ struct addrinfo *res,
     if (setnonblocking(sockfd) == -1)
         ERROR("setnonblocking");
 
-    if (local_addr != NULL)
-        if (bind_to_address(sockfd, local_addr) == -1) {
-            ERROR("bind_to_address");
+    if (is_bind_local_addr)
+    {
+        struct sockaddr_storage *local_addr =
+            res->ai_family == AF_INET ? &local_addr_v4 : &local_addr_v6;
+        if (bind_to_addr(local_addr, sockfd) == -1) {
+            ERROR("bind_to_addr");
             close(sockfd);
             return NULL;
         }
+    }
 
 #ifdef SET_INTERFACE
     if (iface) {
@@ -1678,7 +1685,8 @@ main(int argc, char **argv)
             }
             break;
         case 'b':
-            local_addr = optarg;
+            if (parse_local_addr(&local_addr_v4, &local_addr_v6, optarg) == 0)
+                is_bind_local_addr = 1;
             break;
         case 'p':
             server_port = optarg;
@@ -1801,8 +1809,13 @@ main(int argc, char **argv)
         if (fast_open == 0) {
             fast_open = conf->fast_open;
         }
-        if (local_addr == NULL) {
-            local_addr = conf->local_addr;
+        if (is_bind_local_addr == 0) {
+            if (parse_local_addr(&local_addr_v4, &local_addr_v6, conf->local_addr) == 0)
+                is_bind_local_addr = 1;
+            if (parse_local_addr(&local_addr_v4, &local_addr_v6, conf->local_addr_v4) == 0)
+                is_bind_local_addr = 1;
+            if (parse_local_addr(&local_addr_v4, &local_addr_v6, conf->local_addr_v6) == 0)
+                is_bind_local_addr = 1;
         }
 #ifdef HAVE_SETRLIMIT
         if (nofile == 0) {
diff --git a/src/udprelay.c b/src/udprelay.c
index b58ee130..91d6f330 100644
--- a/src/udprelay.c
+++ b/src/udprelay.c
@@ -98,7 +98,10 @@ extern int reuse_port;
 #ifdef MODULE_REMOTE
 extern uint64_t tx;
 extern uint64_t rx;
-extern char *local_addr;
+
+extern int is_bind_local_addr;
+extern struct sockaddr_storage local_addr_v4;
+extern struct sockaddr_storage local_addr_v6;
 #endif
 
 static int packet_size                               = DEFAULT_PACKET_SIZE;
@@ -371,9 +374,9 @@ create_remote_socket(int ipv6)
             return -1;
         }
 #ifdef MODULE_REMOTE
-        if (local_addr != NULL) {
-            if (bind_to_address(remote_sock, local_addr) == -1) {
-                ERROR("bind_to_address");
+        if (is_bind_local_addr) {
+            if (bind_to_addr(&local_addr_v6, remote_sock) == -1) {
+                ERROR("bind_to_addr");
                 FATAL("[udp] cannot bind remote");
                 return -1;
             }
@@ -399,9 +402,9 @@ create_remote_socket(int ipv6)
             return -1;
         }
 #ifdef MODULE_REMOTE
-        if (local_addr != NULL) {
-            if (bind_to_address(remote_sock, local_addr) == -1) {
-                ERROR("bind_to_address");
+        if (is_bind_local_addr) {
+            if (bind_to_addr(&local_addr_v4, remote_sock) == -1) {
+                ERROR("bind_to_addr");
                 FATAL("[udp] cannot bind remote");
                 return -1;
             }