diff --git a/include/sigar_private.h b/include/sigar_private.h
index fde2465f..b9b657a8 100644
--- a/include/sigar_private.h
+++ b/include/sigar_private.h
@@ -363,8 +363,30 @@ int sigar_get_iftype(const char *name, int *type, int *inst);
 #endif
 
 #define SIGAR_NIC_LOOPBACK "Local Loopback"
+#define SIGAR_NIC_UNSPEC   "UNSPEC"
+#define SIGAR_NIC_SLIP     "Serial Line IP"
+#define SIGAR_NIC_CSLIP    "VJ Serial Line IP"
+#define SIGAR_NIC_SLIP6    "6-bit Serial Line IP"
+#define SIGAR_NIC_CSLIP6   "VJ 6-bit Serial Line IP"
+#define SIGAR_NIC_ADAPTIVE "Adaptive Serial Line IP"
 #define SIGAR_NIC_ETHERNET "Ethernet"
+#define SIGAR_NIC_ASH      "Ash"
+#define SIGAR_NIC_FDDI     "Fiber Distributed Data Interface"
+#define SIGAR_NIC_HIPPI    "HIPPI"
+#define SIGAR_NIC_AX25     "AMPR AX.25"
+#define SIGAR_NIC_ROSE     "AMPR ROSE"
 #define SIGAR_NIC_NETROM   "AMPR NET/ROM"
+#define SIGAR_NIC_X25      "generic X.25"
+#define SIGAR_NIC_TUNNEL   "IPIP Tunnel"
+#define SIGAR_NIC_PPP      "Point-to-Point Protocol"
+#define SIGAR_NIC_HDLC     "(Cisco)-HDLC"
+#define SIGAR_NIC_LAPB     "LAPB"
+#define SIGAR_NIC_ARCNET   "ARCnet"
+#define SIGAR_NIC_DLCI     "Frame Relay DLCI"
+#define SIGAR_NIC_FRAD     "Frame Relay Access Device"
+#define SIGAR_NIC_SIT      "IPv6-in-IPv4"
+#define SIGAR_NIC_IRDA     "IrLAP"
+#define SIGAR_NIC_EC       "Econet"
 
 #ifndef WIN32
 #include <netdb.h>
diff --git a/src/sigar.c b/src/sigar.c
index 9ab00450..14512778 100644
--- a/src/sigar.c
+++ b/src/sigar.c
@@ -1499,12 +1499,77 @@ static void get_interface_type(sigar_net_interface_config_t *ifconfig,
     char *type;
 
     switch (family) {
+      case ARPHRD_SLIP:
+        type = SIGAR_NIC_SLIP;
+        break;
+      case ARPHRD_CSLIP:
+        type = SIGAR_NIC_CSLIP;
+        break;
+      case ARPHRD_SLIP6:
+        type = SIGAR_NIC_SLIP6;
+        break;
+      case ARPHRD_CSLIP6:
+        type = SIGAR_NIC_CSLIP6;
+        break;
+      case ARPHRD_ADAPT:
+        type = SIGAR_NIC_ADAPTIVE;
+        break;
+      case ARPHRD_ETHER:
+        type = SIGAR_NIC_ETHERNET;
+        break;
+      case ARPHRD_ASH:
+        type = SIGAR_NIC_ASH;
+        break;
+      case ARPHRD_FDDI:
+        type = SIGAR_NIC_FDDI;
+        break;
+      case ARPHRD_HIPPI:
+        type = SIGAR_NIC_HIPPI;
+        break;
+      case ARPHRD_AX25:
+        type = SIGAR_NIC_AX25;
+        break;
+      case ARPHRD_ROSE:
+        type = SIGAR_NIC_ROSE;
+        break;
       case ARPHRD_NETROM:
         type = SIGAR_NIC_NETROM;
         break;
-        /* XXX more */
+      case ARPHRD_X25:
+        type = SIGAR_NIC_X25;
+        break;
+      case ARPHRD_TUNNEL:
+        type = SIGAR_NIC_TUNNEL;
+        break;
+      case ARPHRD_PPP:
+        type = SIGAR_NIC_PPP;
+        break;
+      case ARPHRD_CISCO:
+        type = SIGAR_NIC_HDLC;
+        break;
+      case ARPHRD_LAPB:
+        type = SIGAR_NIC_LAPB;
+        break;
+      case ARPHRD_ARCNET:
+        type = SIGAR_NIC_ARCNET;
+        break;
+      case ARPHRD_DLCI:
+        type = SIGAR_NIC_DLCI;
+        break;
+      case ARPHRD_FRAD:
+        type = SIGAR_NIC_FRAD;
+        break;
+      case ARPHRD_SIT:
+        type = SIGAR_NIC_SIT;
+        break;
+      case ARPHRD_IRDA:
+        type = SIGAR_NIC_IRDA;
+        break;
+      case ARPHRD_ECONET:
+        type = SIGAR_NIC_EC;
+        break;
       default:
-        type = SIGAR_NIC_ETHERNET;
+        type = SIGAR_NIC_UNSPEC;
         break;
     }