diff --git a/zebra/if_sysctl.c b/zebra/if_sysctl.c
new file mode 100644
index 0000000..1441dfc
--- /dev/null
+++ b/zebra/if_sysctl.c
@@ -0,0 +1,148 @@
+/*
+ * Get interface's address and mask information by sysctl() function.
+ * Copyright (C) 1997, 98 Kunihiro Ishiguro
+ *
+ * This file is part of GNU Zebra.
+ *
+ * GNU Zebra is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * GNU Zebra is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Zebra; see the file COPYING.  If not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.  
+ */
+
+#include <zebra.h>
+
+#include "if.h"
+#include "sockunion.h"
+#include "prefix.h"
+#include "connected.h"
+#include "memory.h"
+#include "ioctl.h"
+#include "log.h"
+
+int
+ifstat_update_sysctl ()
+{
+  caddr_t ref, buf, end;
+  size_t bufsiz;
+  struct if_msghdr *ifm;
+  struct interface *ifp;
+
+#define MIBSIZ 6
+  int mib[MIBSIZ] =
+  { 
+    CTL_NET,
+    PF_ROUTE,
+    0,
+    0, /*  AF_INET & AF_INET6 */
+    NET_RT_IFLIST,
+    0 
+  };
+
+  /* Query buffer size. */
+  if (sysctl (mib, MIBSIZ, NULL, &bufsiz, NULL, 0) < 0) 
+    {
+      zlog_warn ("sysctl() error by %s", strerror (errno));
+      return -1;
+    }
+
+  /* We free this memory at the end of this function. */
+  ref = buf = XMALLOC (MTYPE_TMP, bufsiz);
+
+  /* Fetch interface informations into allocated buffer. */
+  if (sysctl (mib, MIBSIZ, buf, &bufsiz, NULL, 0) < 0) 
+    {
+      zlog (NULL, LOG_WARNING, "sysctl error by %s", strerror (errno));
+      return -1;
+    }
+
+  /* Parse both interfaces and addresses. */
+  for (end = buf + bufsiz; buf < end; buf += ifm->ifm_msglen) 
+    {
+      ifm = (struct if_msghdr *) buf;
+      if (ifm->ifm_type == RTM_IFINFO)
+	{
+	  ifp = if_lookup_by_index (ifm->ifm_index);
+	  if (ifp)
+	    ifp->stats = ifm->ifm_data;
+	}
+    }
+
+  /* Free sysctl buffer. */
+  XFREE (MTYPE_TMP, ref);
+
+  return 0;
+}
+
+/* Interface listing up function using sysctl(). */
+void
+interface_list ()
+{
+  caddr_t ref, buf, end;
+  size_t bufsiz;
+  struct if_msghdr *ifm;
+  int ifm_read (struct if_msghdr *);
+  int ifam_read (struct ifa_msghdr *);
+
+#define MIBSIZ 6
+  int mib[MIBSIZ] =
+  { 
+    CTL_NET,
+    PF_ROUTE,
+    0,
+    0, /*  AF_INET & AF_INET6 */
+    NET_RT_IFLIST,
+    0 
+  };
+
+  /* Query buffer size. */
+  if (sysctl (mib, MIBSIZ, NULL, &bufsiz, NULL, 0) < 0) 
+    {
+      zlog (NULL, LOG_WARNING, "sysctl() error by %s", strerror (errno));
+      return;
+    }
+
+  /* We free this memory at the end of this function. */
+  ref = buf = XMALLOC (MTYPE_TMP, bufsiz);
+
+  /* Fetch interface informations into allocated buffer. */
+  if (sysctl (mib, MIBSIZ, buf, &bufsiz, NULL, 0) < 0) 
+    {
+      zlog (NULL, LOG_WARNING, "sysctl error by %s", strerror (errno));
+      return;
+    }
+
+  /* Parse both interfaces and addresses. */
+  for (end = buf + bufsiz; buf < end; buf += ifm->ifm_msglen) 
+    {
+      ifm = (struct if_msghdr *) buf;
+
+      switch (ifm->ifm_type) 
+	{
+	case RTM_IFINFO:
+	  ifm_read (ifm);
+	  break;
+	case RTM_NEWADDR:
+	  ifam_read ((struct ifa_msghdr *) ifm);
+	  break;
+	default:
+	  zlog_info ("interfaces_list(): unexpected message type");
+	  XFREE (MTYPE_TMP, ref);
+	  return;
+	  break;
+	}
+    }
+
+  /* Free sysctl buffer. */
+  XFREE (MTYPE_TMP, ref);
+}