1 files changed, 12 insertions, 2 deletions

diff --git a/plugins/check_ntp.c b/plugins/check_ntp.c
index c2fa98d5..56e5a05d 100644
--- a/plugins/check_ntp.c
+++ b/plugins/check_ntp.c
@@ -191,7 +191,7 @@ int process_arguments(int argc, char **argv){
                 {"help", no_argument, 0, 'h'},
                 {"verbose", no_argument, 0, 'v'},
                 {"use-ipv4", no_argument, 0, '4'},
-/*              {"use-ipv6", no_argument, 0, '6'}, */
+                {"use-ipv6", no_argument, 0, '6'},
                 {"warning", required_argument, 0, 'w'},
                 {"critical", required_argument, 0, 'c'},
                 {"zero-offset", no_argument, 0, 'O'},
@@ -207,7 +207,7 @@ int process_arguments(int argc, char **argv){
                 usage ("\n");
 
         while (1) {
-                c = getopt_long (argc, argv, "Vhv4w:c:Oj:k:t:H:", longopts, &option);
+                c = getopt_long (argc, argv, "Vhv46w:c:Oj:k:t:H:", longopts, &option);
                 if (c == -1 || c == EOF || c == 1)
                         break;
 
@@ -248,6 +248,16 @@ int process_arguments(int argc, char **argv){
                 case 'O':
                         zero_offset_bad=1;
                         break;
+                case '4':
+                        address_family = AF_INET;
+                        break;
+                case '6':
+#ifdef USE_IPV6
+                        address_family = AF_INET6;
+#else
+                        usage4 (_("IPv6 support not available"));
+#endif
+                        break;
                 case '?':
                         /* print short usage statement if args not parsable */
                         usage2 (_("Unknown argument"), optarg);