diff --git a/src/settings/plugins/ifcfg-rh/tests/test-ifcfg-rh.c b/src/settings/plugins/ifcfg-rh/tests/test-ifcfg-rh.c
index 2b8df270a..fcad1707b 100644
--- a/src/settings/plugins/ifcfg-rh/tests/test-ifcfg-rh.c
+++ b/src/settings/plugins/ifcfg-rh/tests/test-ifcfg-rh.c
@@ -12508,6 +12508,124 @@ test_write_vlan_only_vlanid (void)
 	g_object_unref (reread);
 }
 
+static void
+test_write_ethernet_missing_ipv6 (void)
+{
+	NMConnection *connection;
+	NMConnection *reread;
+	NMSettingConnection *s_con;
+	NMSettingWired *s_wired;
+	NMSettingIP4Config *s_ip4;
+	NMSettingIP6Config *s_ip6;
+	char *uuid;
+	gboolean success;
+	GError *error = NULL;
+	char *testfile = NULL;
+	char *unmanaged = NULL;
+	char *keyfile = NULL;
+	char *routefile = NULL;
+	char *route6file = NULL;
+	gboolean ignore_error = FALSE;
+
+	connection = nm_connection_new ();
+	g_assert (connection);
+
+	/* Connection setting */
+	s_con = (NMSettingConnection *) nm_setting_connection_new ();
+	g_assert (s_con);
+	nm_connection_add_setting (connection, NM_SETTING (s_con));
+
+	uuid = nm_utils_uuid_generate ();
+	g_object_set (s_con,
+	              NM_SETTING_CONNECTION_ID, "Test Write Ethernet Without IPv6 Setting",
+	              NM_SETTING_CONNECTION_UUID, uuid,
+	              NM_SETTING_CONNECTION_AUTOCONNECT, TRUE,
+	              NM_SETTING_CONNECTION_TYPE, NM_SETTING_WIRED_SETTING_NAME,
+	              NULL);
+	g_free (uuid);
+
+	/* Wired setting */
+	s_wired = (NMSettingWired *) nm_setting_wired_new ();
+	g_assert (s_wired);
+	nm_connection_add_setting (connection, NM_SETTING (s_wired));
+
+	/* IP4 setting */
+	s_ip4 = (NMSettingIP4Config *) nm_setting_ip4_config_new ();
+	g_assert (s_ip4);
+	nm_connection_add_setting (connection, NM_SETTING (s_ip4));
+	g_object_set (s_ip4,
+	              NM_SETTING_IP4_CONFIG_METHOD, NM_SETTING_IP4_CONFIG_METHOD_AUTO,
+	              NM_SETTING_IP4_CONFIG_DHCP_CLIENT_ID, "random-client-id-00:22:33",
+	              NM_SETTING_IP4_CONFIG_IGNORE_AUTO_ROUTES, TRUE,
+	              NM_SETTING_IP4_CONFIG_IGNORE_AUTO_DNS, TRUE,
+	              NULL);
+
+	/* IP6 setting */
+	/*
+	 * We intentionally don't add IPv6 setting here. ifcfg-rh plugin should regard
+	 * missing IPv6 as IPv6 with NM_SETTING_IP6_CONFIG_METHOD_AUTO method.
+	 */
+
+	ASSERT (nm_connection_verify (connection, &error) == TRUE,
+	        "ethernet-missing-ipv6", "failed to verify connection: %s",
+	        (error && error->message) ? error->message : "(unknown)");
+
+	/* Save the ifcfg */
+	success = writer_new_connection (connection,
+	                                 TEST_SCRATCH_DIR "/network-scripts/",
+	                                 &testfile,
+	                                 &error);
+	ASSERT (success == TRUE,
+	        "ethernet-missing-ipv6", "failed to write connection to disk: %s",
+	        (error && error->message) ? error->message : "(unknown)");
+
+	ASSERT (testfile != NULL,
+	        "ethernet-missing-ipv6", "didn't get ifcfg file path back after writing connection");
+
+	/* re-read the connection for comparison */
+	reread = connection_from_file (testfile,
+	                               NULL,
+	                               TYPE_ETHERNET,
+	                               NULL,
+	                               &unmanaged,
+	                               &keyfile,
+	                               &routefile,
+	                               &route6file,
+	                               &error,
+	                               &ignore_error);
+	unlink (testfile);
+
+	ASSERT (reread != NULL,
+	        "ethernet-missing-ipv6-reread", "failed to read %s: %s", testfile, error->message);
+
+	ASSERT (nm_connection_verify (reread, &error),
+	        "ethernet-missing-ipv6-reread-verify", "failed to verify %s: %s", testfile, error->message);
+
+	/*
+	 * We need to add IPv6 setting to the original connection now so that
+	 * the comparison can succeed. Missing IPv6 setting should have been
+	 * written out (and re-read) as Automatic IPv6.
+	 */
+	s_ip6 = (NMSettingIP6Config *) nm_setting_ip6_config_new ();
+	g_assert (s_ip6);
+	nm_connection_add_setting (connection, NM_SETTING (s_ip6));
+	g_object_set (s_ip6,
+	              NM_SETTING_IP6_CONFIG_METHOD, NM_SETTING_IP6_CONFIG_METHOD_AUTO,
+	              NM_SETTING_IP6_CONFIG_MAY_FAIL, TRUE,
+	              NULL);
+
+	ASSERT (nm_connection_compare (connection, reread, NM_SETTING_COMPARE_FLAG_EXACT) == TRUE,
+	        "ethernet-missing-ipv6", "written and re-read connection weren't the same.");
+
+	g_free (testfile);
+	g_free (unmanaged);
+	g_free (keyfile);
+	g_free (routefile);
+	g_free (route6file);
+	g_object_unref (connection);
+	g_object_unref (reread);
+}
+
 #define TEST_IFCFG_BOND_MAIN TEST_IFCFG_DIR"/network-scripts/ifcfg-test-bond-main"
 
 static void
@@ -13403,6 +13521,7 @@ int main (int argc, char **argv)
 	test_write_infiniband ();
 	test_write_vlan ();
 	test_write_vlan_only_vlanid ();
+	test_write_ethernet_missing_ipv6 ();
 
 	/* iSCSI / ibft */
 	test_read_ibft_dhcp ();
diff --git a/src/settings/plugins/ifcfg-rh/writer.c b/src/settings/plugins/ifcfg-rh/writer.c
index f0ee023ba..e258081f8 100644
--- a/src/settings/plugins/ifcfg-rh/writer.c
+++ b/src/settings/plugins/ifcfg-rh/writer.c
@@ -1897,9 +1897,15 @@ write_ip6_setting (NMConnection *connection, shvarFile *ifcfg, GError **error)
 
 	s_ip6 = nm_connection_get_setting_ip6_config (connection);
 	if (!s_ip6) {
-		g_set_error (error, IFCFG_PLUGIN_ERROR, 0,
-		             "Missing '%s' setting", NM_SETTING_IP6_CONFIG_SETTING_NAME);
-		return FALSE;
+		/* Treat missing IPv6 setting as a setting with method "auto" */
+		svSetValue (ifcfg, "IPV6INIT", "yes", FALSE);
+		svSetValue (ifcfg, "IPV6_AUTOCONF", "yes", FALSE);
+		svSetValue (ifcfg, "DHCPV6C", NULL, FALSE);
+		svSetValue (ifcfg, "IPV6_DEFROUTE", "yes", FALSE);
+		svSetValue (ifcfg, "IPV6_PEERDNS", "yes", FALSE);
+		svSetValue (ifcfg, "IPV6_PEERROUTES", "yes", FALSE);
+		svSetValue (ifcfg, "IPV6_FAILURE_FATAL", "no", FALSE);
+		return TRUE;
 	}
 
 	value = nm_setting_ip6_config_get_method (s_ip6);
@@ -2210,10 +2216,8 @@ write_connection (NMConnection *connection,
 		if (!write_ip4_setting (connection, ifcfg, error))
 			goto out;
 
-		if (nm_connection_get_setting_ip6_config (connection)) {
-			if (!write_ip6_setting (connection, ifcfg, error))
-				goto out;
-		}
+		if (!write_ip6_setting (connection, ifcfg, error))
+			goto out;
 	}
 
 	write_connection_setting (s_con, ifcfg);