diff -p -up dhcp-4.1.1/common/discover.c.ipv6_not_fatal dhcp-4.1.1/common/discover.c
--- dhcp-4.1.1/common/discover.c.ipv6_not_fatal	2009-09-29 16:44:49.000000000 -0300
+++ dhcp-4.1.1/common/discover.c	2010-02-25 11:35:34.000000000 -0300
@@ -444,15 +444,19 @@ begin_iface_scan(struct iface_conf_list 
 
 #ifdef DHCPv6
 	if (local_family == AF_INET6) {
-		ifaces->fp6 = fopen("/proc/net/if_inet6", "r");
-		if (ifaces->fp6 == NULL) {
-			log_error("Error opening '/proc/net/if_inet6' to "
-				  "list IPv6 interfaces; %m");
-			close(ifaces->sock);
-			ifaces->sock = -1;
-			fclose(ifaces->fp);
-			ifaces->fp = NULL;
-			return 0;
+		if (!access("/proc/net/if_inet6", R_OK)) {
+			ifaces->fp6 = fopen("/proc/net/if_inet6", "r");
+			if (ifaces->fp6 == NULL) {
+				log_error("Error opening '/proc/net/if_inet6' to "
+					  "list IPv6 interfaces; %m");
+				close(ifaces->sock);
+				ifaces->sock = -1;
+				fclose(ifaces->fp);
+				ifaces->fp = NULL;
+				return 0;
+			}
+		} else {
+			ifaces->fp6 = NULL;
 		}
 	}
 #endif
@@ -721,7 +725,7 @@ next_iface(struct iface_info *info, int 
 		return 1;
 	}
 #ifdef DHCPv6
-	if (!(*err)) {
+	if (!(*err) && ifaces->fp6) {
 		if (local_family == AF_INET6)
 			return next_iface6(info, err, ifaces);
 	}
@@ -740,7 +744,8 @@ end_iface_scan(struct iface_conf_list *i
 	ifaces->sock = -1;
 #ifdef DHCPv6
 	if (local_family == AF_INET6) {
-		fclose(ifaces->fp6);
+		if (ifaces->fp6)
+			fclose(ifaces->fp6);
 		ifaces->fp6 = NULL;
 	}
 #endif