diff -up dhcp-4.3.1b1/client/dhc6.c.mRfpsB dhcp-4.3.1b1/client/dhc6.c
--- dhcp-4.3.1b1/client/dhc6.c.mRfpsB	2014-07-10 17:48:03.779424870 +0200
+++ dhcp-4.3.1b1/client/dhc6.c	2014-07-10 17:48:03.795424644 +0200
@@ -5088,7 +5088,8 @@ make_client6_options(struct client_state
 	 */
 	if ((oc = lookup_option(&dhcpv6_universe, *op,
 				D6O_CLIENTID)) == NULL) {
-		if (!option_cache(&oc, &default_duid, NULL, clientid_option,
+		if (default_duid.len == 0 ||
+		    !option_cache(&oc, &default_duid, NULL, clientid_option,
 				  MDL))
 			log_fatal("Failure assembling a DUID.");
 
diff -up dhcp-4.3.1b1/client/dhclient.c.mRfpsB dhcp-4.3.1b1/client/dhclient.c
--- dhcp-4.3.1b1/client/dhclient.c.mRfpsB	2014-07-10 17:39:25.853763858 +0200
+++ dhcp-4.3.1b1/client/dhclient.c	2014-07-10 17:49:49.882925843 +0200
@@ -948,8 +948,8 @@ main(int argc, char **argv) {
 			if (default_duid.buffer != NULL)
 				data_string_forget(&default_duid, MDL);
 
-			form_duid(&default_duid, MDL);
-			write_duid(&default_duid);
+			if (form_duid(&default_duid, MDL) == ISC_R_SUCCESS)
+				write_duid(&default_duid);
 		}
 	}
 
@@ -3267,7 +3267,7 @@ write_options(struct client_state *clien
  * is not how it is intended.  Upcoming rearchitecting the client should
  * address this "one daemon model."
  */
-void
+isc_result_t
 form_duid(struct data_string *duid, const char *file, int line)
 {
 	struct interface_info *ip;
@@ -3280,6 +3280,15 @@ form_duid(struct data_string *duid, cons
 	if (ip == NULL)
 		log_fatal("Impossible condition at %s:%d.", MDL);
 
+	while (ip && ip->hw_address.hbuf[0] == HTYPE_RESERVED) {
+		/* Try the other interfaces */
+		log_debug("Cannot form default DUID from interface %s.", ip->name);
+		ip = ip->next;
+	}
+	if (ip == NULL) {
+		return ISC_R_UNEXPECTED;
+	}
+
 	if ((ip->hw_address.hlen == 0) ||
 	    (ip->hw_address.hlen > sizeof(ip->hw_address.hbuf)))
 		log_fatal("Impossible hardware address length at %s:%d.", MDL);
@@ -3323,6 +3332,8 @@ form_duid(struct data_string *duid, cons
 		log_info("Created duid %s.", str);
 		dfree(str, MDL);
 	}
+	
+	return ISC_R_SUCCESS;
 }
 
 /* Write the default DUID to the lease store. */
diff -up dhcp-4.3.1b1/common/bpf.c.mRfpsB dhcp-4.3.1b1/common/bpf.c
--- dhcp-4.3.1b1/common/bpf.c.mRfpsB	2014-07-10 17:39:25.797764653 +0200
+++ dhcp-4.3.1b1/common/bpf.c	2014-07-10 17:48:03.797424616 +0200
@@ -600,6 +600,22 @@ get_hw_addr(const char *name, struct har
                         memcpy(&hw->hbuf[1], LLADDR(sa), sa->sdl_alen);
                         break;
 #endif /* IFT_FDDI */
+#if defined(IFT_PPP)
+                case IFT_PPP:
+                        if (local_family != AF_INET6)
+                             log_fatal("Unsupported device type %d for \"%s\"",
+                                        sa->sdl_type, name);
+                        hw->hlen = 0;
+                        hw->hbuf[0] = HTYPE_RESERVED;
+                        /* 0xdeadbeef should never occur on the wire,
+                         *  and is a signature that something went wrong.
+                         */
+                        hw->hbuf[1] = 0xde;
+                        hw->hbuf[2] = 0xad;
+                        hw->hbuf[3] = 0xbe;
+                        hw->hbuf[4] = 0xef;
+                        break;
+#endif
                 default:
                         log_fatal("Unsupported device type %d for \"%s\"",
                                   sa->sdl_type, name);
diff -up dhcp-4.3.1b1/common/lpf.c.mRfpsB dhcp-4.3.1b1/common/lpf.c
--- dhcp-4.3.1b1/common/lpf.c.mRfpsB	2014-07-10 17:39:25.744765404 +0200
+++ dhcp-4.3.1b1/common/lpf.c	2014-07-10 17:48:03.797424616 +0200
@@ -511,6 +511,22 @@ get_hw_addr(const char *name, struct har
 			hw->hbuf[0] = HTYPE_FDDI;
 			memcpy(&hw->hbuf[1], sa->sa_data, 6);
 			break;
+#if defined(ARPHRD_PPP)
+		case ARPHRD_PPP:
+			if (local_family != AF_INET6)
+				log_fatal("Unsupported device type %d for \"%s\"",
+				           sa->sa_family, name);
+			hw->hlen = 0;
+			hw->hbuf[0] = HTYPE_RESERVED;
+			/* 0xdeadbeef should never occur on the wire,
+			 * and is a signature that something went wrong.
+			 */
+			hw->hbuf[1] = 0xde;
+			hw->hbuf[2] = 0xad;
+			hw->hbuf[3] = 0xbe;
+			hw->hbuf[4] = 0xef;
+			break;
+#endif
 		default:
 			log_fatal("Unsupported device type %ld for \"%s\"",
 				  (long int)sa->sa_family, name);
diff -up dhcp-4.3.1b1/includes/dhcpd.h.mRfpsB dhcp-4.3.1b1/includes/dhcpd.h
--- dhcp-4.3.1b1/includes/dhcpd.h.mRfpsB	2014-07-10 17:48:03.761425124 +0200
+++ dhcp-4.3.1b1/includes/dhcpd.h	2014-07-10 17:48:03.798424601 +0200
@@ -2839,7 +2839,7 @@ void client_dns_remove(struct client_sta
 
 void dhcpv4_client_assignments(void);
 void dhcpv6_client_assignments(void);
-void form_duid(struct data_string *duid, const char *file, int line);
+isc_result_t form_duid(struct data_string *duid, const char *file, int line);
 
 /* dhc6.c */
 void dhc6_lease_destroy(struct dhc6_lease **src, const char *file, int line);
diff -up dhcp-4.3.1b1/includes/dhcp.h.mRfpsB dhcp-4.3.1b1/includes/dhcp.h
--- dhcp-4.3.1b1/includes/dhcp.h.mRfpsB	2014-07-10 17:48:03.761425124 +0200
+++ dhcp-4.3.1b1/includes/dhcp.h	2014-07-10 17:48:03.798424601 +0200
@@ -81,6 +81,8 @@ struct dhcp_packet {
 					 * is no standard for this so we
 					 * just steal a type            */
 
+#define HTYPE_RESERVED	0		/* RFC 5494 */
+
 /* Magic cookie validating dhcp options field (and bootp vendor
    extensions field). */
 #define DHCP_OPTIONS_COOKIE	"\143\202\123\143"
diff -up dhcp-4.3.1b1/server/dhcpv6.c.mRfpsB dhcp-4.3.1b1/server/dhcpv6.c
--- dhcp-4.3.1b1/server/dhcpv6.c.mRfpsB	2014-07-10 17:47:31.464881409 +0200
+++ dhcp-4.3.1b1/server/dhcpv6.c	2014-07-10 17:48:03.800424573 +0200
@@ -330,6 +330,9 @@ generate_new_server_duid(void) {
 		if (p->hw_address.hlen > 0) {
 			break;
 		}
+		if (p->next == NULL && p->hw_address.hbuf[0] == HTYPE_RESERVED) {
+			log_error("Can not generate DUID from interfaces which do not have hardware addresses, please configure server-duid!");
+		}
 	}
 	if (p == NULL) {
 		return ISC_R_UNEXPECTED;