-#define IFT_LOOP 0x1 /* loopback */
-#define IFT_XETHER 0x2 /* old 3MBaud experimental ethernet */
-#define IFT_ETHER 0x3 /* 802.3 */
-#define IFT_IMP 0x4 /* Arpanet imp interface */
-#define IFT_P8010 0x5 /* Pronet 10/Pronet 80 */
-#define IFT_EON 0x6 /* ISO over IP */
-#define IFT_HY 0x7 /* Hyperchannel */
+#define IFT_OTHER 0x1 /* none of the following */
+#define IFT_1822 0x2 /* old-style arpanet imp */
+#define IFT_HDH1822 0x3 /* HDH arpanet imp */
+#define IFT_X25DDN 0x4 /* x25 to imp */
+#define IFT_X25 0x5 /* PDN X25 interface */
+#define IFT_ETHER 0x6 /* Ethernet I or II */
+#define IFT_ISO88023 0x7 /* CMSA CD */
+#define IFT_ISO88024 0x8 /* Token Bus */
+#define IFT_ISO88025 0x9 /* Token Ring */
+#define IFT_ISO88026 0xa /* MAN */
+#define IFT_STARLAN 0xb
+#define IFT_P10 0xc /* Proteon 10MBit ring */
+#define IFT_P80 0xd /* Proteon 10MBit ring */
+#define IFT_HY 0xe /* Hyperchannel */
+#define IFT_FDDI 0xf
+#define IFT_LAPB 0x10
+#define IFT_SDLC 0x11
+#define IFT_T1 0x12
+#define IFT_CEPT 0x13
+#define IFT_ISDNBASIC 0x14
+#define IFT_ISDNPRIMARY 0x15
+#define IFT_PTPSERIAL 0x16
+#define IFT_LOOP 0x18 /* loopback */
+#define IFT_EON 0x19 /* ISO over IP */
+#define IFT_XETHER 0x1a /* obsolete 3MB experimental ethernet */
+#define IFT_NSIP 0x1b /* XNS over IP */
+#define IFT_SLIP 0x1c /* IP over generic TTY */