1 files changed, 7 insertions, 7 deletions

diff --git a/plugins-root/check_icmp.c b/plugins-root/check_icmp.c
index 5fb9c36..fe1f9ee 100644
--- a/plugins-root/check_icmp.c
+++ b/plugins-root/check_icmp.c
@@ -463,13 +463,13 @@ main(int argc, char **argv)
                         case 'b':
                                 size = strtol(optarg,NULL,0);
                                 if (size >= (sizeof(struct icmp) + sizeof(struct icmp_ping_data)) &&
-                                    size <= MAX_PING_DATA + ICMP_MINLEN) {
-                                        icmp_pkt_size = size;
-                                        icmp_data_size = icmp_pkt_size - ICMP_MINLEN;
+                                    size < MAX_PING_DATA) {
+                                        icmp_data_size = size;
+                                        icmp_pkt_size = size + ICMP_MINLEN;
                                 } else
-                                        usage_va("ICMP packet size must be between: %d and %d",
+                                        usage_va("ICMP data length must be between: %d and %d",
                                                  sizeof(struct icmp) + sizeof(struct icmp_ping_data),
-                                                 MAX_PING_DATA + ICMP_MINLEN);
+                                                 MAX_PING_DATA - 1);
 
                                 break;
                         case 'i':
@@ -1301,8 +1301,8 @@ print_help(void)
   printf ("    %s",_("timeout value (seconds, currently  "));
   printf ("%u)\n", timeout);
   printf (" %s\n", "-b");
-  printf ("    %s", _("icmp packet size (bytes, currently "));
-  printf ("%u)\n", icmp_pkt_size);
+  printf ("    %s\n", _("Number of icmp data bytes to send")); 
+  printf ("    %s %u + %d)\n", _("Packet size will be data bytes + icmp header (currently"),icmp_data_size, ICMP_MINLEN);
   printf (" %s\n", "-v");
   printf ("    %s\n", _("verbose"));