diff --git a/examples/thttpd/thttpd_main.c b/examples/thttpd/thttpd_main.c
index e2778093a..89677f855 100644
--- a/examples/thttpd/thttpd_main.c
+++ b/examples/thttpd/thttpd_main.c
@@ -95,14 +95,25 @@
 #  error "You must not disable loadable modules via CONFIG_BINFMT_DISABLE in your configuration file"
 #endif
 
+/* Ethernet specific configuration */
+
+#ifdef CONFIG_NET_ETHERNET
+
+   /* Otherwise, use the standard Ethernet device name */
+
+#  define NET_DEVNAME "eth0"
+
+#else
+
+   /* No Ethernet -> No MAC address operations */
+
+#  undef CONFIG_EXAMPLES_THTTPD_NOMAC
+#endif
+
 /* SLIP-specific configuration */
 
 #ifdef CONFIG_NET_SLIP
 
-   /* No MAC address operations */
-
-#  undef CONFIG_EXAMPLES_THTTPD_NOMAC
-
    /* TTY device to use */
 
 #  ifndef CONFIG_NET_SLIPTTY
@@ -110,12 +121,10 @@
 #  endif
 
 #  define SLIP_DEVNO 0
-#  define NET_DEVNAME "sl0"
-#else
 
-   /* Otherwise, use the standard ethernet device name */
-
-#  define NET_DEVNAME "eth0"
+#  ifndef NET_DEVNAME
+#    define NET_DEVNAME "sl0"
+#  endif
 #endif
 
 /* Describe the ROMFS file system */
diff --git a/netutils/netlib/Makefile b/netutils/netlib/Makefile
index 8de89a857..9710702ba 100644
--- a/netutils/netlib/Makefile
+++ b/netutils/netlib/Makefile
@@ -52,7 +52,7 @@ endif
 
 # No MAC address support for SLIP (Ethernet only)
 
-ifneq ($(CONFIG_NET_SLIP),y)
+ifeq ($(CONFIG_NET_ETHERNET),y)
 CSRCS += netlib_setmacaddr.c netlib_getmacaddr.c
 endif
 
diff --git a/nshlib/nsh_netcmds.c b/nshlib/nsh_netcmds.c
index f70d88e3e..f7cd9dc90 100644
--- a/nshlib/nsh_netcmds.c
+++ b/nshlib/nsh_netcmds.c
@@ -589,7 +589,7 @@ int cmd_ifconfig(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
   FAR char *gwip = NULL;
   FAR char *mask = NULL;
   FAR char *tmp = NULL;
-#ifndef CONFIG_NET_SLIP
+#ifdef CONFIG_NET_ETHERNET
   FAR char *hw = NULL;
 #endif
 #if defined(CONFIG_NSH_DHCPC) || defined(CONFIG_NSH_DNS)
@@ -661,7 +661,7 @@ int cmd_ifconfig(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
                     }
                 }
 
-#ifndef CONFIG_NET_SLIP
+#ifdef CONFIG_NET_ETHERNET
               /* REVISIT: How will we handle Ethernet and SLIP networks together? */
 
               else if (!strcmp(tmp, "hw"))
@@ -703,7 +703,7 @@ int cmd_ifconfig(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
       return ERROR;
     }
 
-#ifndef CONFIG_NET_SLIP
+#ifdef CONFIG_NET_ETHERNET
   /* Set Hardware Ethernet MAC address */
   /* REVISIT: How will we handle Ethernet and SLIP networks together? */
 
diff --git a/nshlib/nsh_netinit.c b/nshlib/nsh_netinit.c
index 1b8a82bf9..16fc78eb6 100644
--- a/nshlib/nsh_netinit.c
+++ b/nshlib/nsh_netinit.c
@@ -92,13 +92,23 @@
  * mixed transports.
  */
 
-#ifdef CONFIG_NET_SLIP
+#ifdef CONFIG_NET_MULILINK
+#  warning REVISIT: CONFIG_NET_MULILINK multilink support incomplete
+#endif
+
+/* If both SLIP and Ethernet interfaces are present, only the Ethernet
+ * interface will be initialized.
+ */
+
+#if defined(CONFIG_NET_ETHERNET)
+#  define NET_DEVNAME "eth0"
+#elif defined(CONFIG_NET_SLIP)
 #  define NET_DEVNAME "sl0"
 #  ifndef CONFIG_NSH_NOMAC
 #    error "CONFIG_NSH_NOMAC must be defined for SLIP"
 #  endif
 #else
-#  define NET_DEVNAME "eth0"
+#  error ERROR: No link layer protocol defined
 #endif
 
 /* While the network is up, the network monitor really does nothing.  It
@@ -143,7 +153,8 @@ static void nsh_netinit_configure(void)
 #if defined(CONFIG_NSH_DHCPC)
   FAR void *handle;
 #endif
-#if (defined(CONFIG_NSH_DHCPC) || defined(CONFIG_NSH_NOMAC)) && !defined(CONFIG_NET_SLIP)
+#if (defined(CONFIG_NSH_DHCPC) || defined(CONFIG_NSH_NOMAC)) && \
+    defined(CONFIG_NET_ETHERNET)
   uint8_t mac[IFHWADDRLEN];
 #endif
 
@@ -151,7 +162,7 @@ static void nsh_netinit_configure(void)
 
   /* Many embedded network interfaces must have a software assigned MAC */
 
-#if defined(CONFIG_NSH_NOMAC) && !defined(CONFIG_NET_SLIP)
+#if defined(CONFIG_NSH_NOMAC) && defined(CONFIG_NET_ETHERNET)
 #ifdef CONFIG_NSH_ARCHMAC
   /* Let platform-specific logic assign the MAC address. */