diff --git a/tools/README.md b/tools/README.md
index 1bb68fd00..f59eaa78b 100644
--- a/tools/README.md
+++ b/tools/README.md
@@ -36,9 +36,12 @@ ifconfig -p <f-stack proc_id> [-f type:format] %sinterface address_family
     ifconfig -p <f-stack proc_id> -l [-d] [-u] [address_family]
     ifconfig -p <f-stack proc_id> %s[-d] [-m] [-u] [-v]
 ```
+We has supportted inet6, you can config ipv6 address like this:
+
+    ifconfig -p <f-stack proc_id> interface inet6 <ipv6 address> autoconf
+
 Unsupported interfaces or parameters:
 ```
-inet6
 MAC(Mandatory Access Control)
 media
 SFP/SFP+
@@ -77,6 +80,7 @@ Examples:
      Display the route for a destination network:
 
        ./sbin/route -p 0 show 172.16.10.0
+       ./sbin/route -p 0 -6 show ::/0
 
      Delete a static route from the routing table:
 
diff --git a/tools/compat/ioctl.c b/tools/compat/ioctl.c
index f29afbd21..73cb81983 100644
--- a/tools/compat/ioctl.c
+++ b/tools/compat/ioctl.c
@@ -53,7 +53,7 @@ ioctl_va(int fd, unsigned long com, void *data, int argc, ...)
     unsigned size;
     void *cpy_mem;
     size_t offset, clen;
-    int af = 0;
+    int af = AF_INET;
 
     if (argc != 0 && argc != 3 && argc != 1) {
         errno = EINVAL;
@@ -107,6 +107,7 @@ ioctl_va(int fd, unsigned long com, void *data, int argc, ...)
         msg->msg_type = FF_IOCTL;
     else {
         errno = EINVAL;
+        ff_ipc_msg_free(msg);
         return -1;
     }
 
diff --git a/tools/ifconfig/af_nd6.c b/tools/ifconfig/af_nd6.c
index c4e4d1423..36f28888e 100644
--- a/tools/ifconfig/af_nd6.c
+++ b/tools/ifconfig/af_nd6.c
@@ -76,7 +76,11 @@ setnd6flags(const char *dummyaddr __unused,
 
 	memset(&nd, 0, sizeof(nd));
 	strlcpy(nd.ifname, ifr.ifr_name, sizeof(nd.ifname));
-	error = ioctl(s, SIOCGIFINFO_IN6, &nd);
+#ifndef FSTACK
+	error = ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd);
+#else
+	error = ioctl_va(s, SIOCGIFINFO_IN6, (caddr_t)&nd, 1, AF_INET6);
+#endif
 	if (error) {
 		warn("ioctl(SIOCGIFINFO_IN6)");
 		return;
@@ -85,7 +89,12 @@ setnd6flags(const char *dummyaddr __unused,
 		nd.ndi.flags &= ~(-d);
 	else
 		nd.ndi.flags |= d;
+
+#ifndef FSTACK
 	error = ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd);
+#else
+	error = ioctl_va(s, SIOCSIFINFO_IN6, (caddr_t)&nd, 1, AF_INET6);
+#endif
 	if (error)
 		warn("ioctl(SIOCSIFINFO_IN6)");
 }
@@ -114,7 +123,11 @@ setnd6defif(const char *dummyaddr __unused,
 	}
 
 	ndifreq.ifindex = ifindex;
+#ifndef FSTACK
 	error = ioctl(s, SIOCSDEFIFACE_IN6, (caddr_t)&ndifreq);
+#else
+	error = ioctl_va(s, SIOCSDEFIFACE_IN6, (caddr_t)&ndifreq, 1, AF_INET6);
+#endif
 	if (error)
 		warn("ioctl(SIOCSDEFIFACE_IN6)");
 }
@@ -130,7 +143,11 @@ isnd6defif(int s)
 	strlcpy(ndifreq.ifname, ifr.ifr_name, sizeof(ndifreq.ifname));
 
 	ifindex = if_nametoindex(ndifreq.ifname);
+#ifndef FSTACK
 	error = ioctl(s, SIOCGDEFIFACE_IN6, (caddr_t)&ndifreq);
+#else
+	error = ioctl_va(s, SIOCGDEFIFACE_IN6, (caddr_t)&ndifreq, 1, AF_INET6);
+#endif
 	if (error) {
 		warn("ioctl(SIOCGDEFIFACE_IN6)");
 		return (error);
@@ -153,7 +170,12 @@ nd6_status(int s)
 			warn("socket(AF_INET6, SOCK_DGRAM)");
 		return;
 	}
+
+#ifndef FSTACK
 	error = ioctl(s6, SIOCGIFINFO_IN6, &nd);
+#else
+	error = ioctl_va(s, SIOCGIFINFO_IN6, (caddr_t)&nd, 1, AF_INET6);
+#endif
 	if (error) {
 		if (errno != EPFNOSUPPORT)
 			warn("ioctl(SIOCGIFINFO_IN6)");