ENET* are temporary failures

Author: alandekok

src/lib/bio/fd_errno.h

@@ -54,9 +54,12 @@ case EPIPE:
 	 *	@todo - do this only for connected UDP sockets.
 	 */
 	case EMSGSIZE:
-		return fr_bio_error(IO);
 #endif
 
+	case ENETDOWN:
+	case ENETUNREACH:
+		return fr_bio_error(IO);
+
 default:
 	/*
 	 *	Some other error, it's fatal.