--- a/docs/hping2.8
+++ b/docs/hping2.8
@@ -343,7 +343,7 @@
 .I -N --id
 Set ip->id field. Default id is random but if fragmentation is turned on
 and id isn't specified it will be
-.BR "getpid() & 0xFF" ,
+.BR "getpid() & 0xFFFF" ,
 to implement a better solution is in TODO list.
 .TP
 .I -H --ipproto
@@ -714,4 +714,4 @@
 a solaris problem, as stated in the tcpdump-workers mailing list,
 so the libpcap can't do nothing to handle it properly.
 .SH SEE ALSO
-ping(8), traceroute(8), ifconfig(8), nmap(1)
\ No newline at end of file
+ping(8), traceroute(8), ifconfig(8), nmap(1)
--- a/docs/hping3.8
+++ b/docs/hping3.8
@@ -352,7 +352,7 @@
 .I -N --id
 Set ip->id field. Default id is random but if fragmentation is turned on
 and id isn't specified it will be
-.BR "getpid() & 0xFF" ,
+.BR "getpid() & 0xFFFF" ,
 to implement a better solution is in TODO list.
 .TP
 .I -H --ipproto
--- a/hping2.h
+++ b/hping2.h
@@ -121,7 +121,7 @@
 #define DEFAULT_ICMP_IP_IHL		(IPHDR_SIZE >> 2)
 #define	DEFAULT_ICMP_IP_TOS		0
 #define DEFAULT_ICMP_IP_TOT_LEN		0 /* computed by send_icmp_*() */
-#define DEFAULT_ICMP_IP_ID		0 /* rand */
+#define DEFAULT_ICMP_IP_ID		-1 /* rand */
 #define DEFAULT_ICMP_CKSUM		-1 /* -1 means compute the cksum */
 #define DEFAULT_ICMP_IP_PROTOCOL	6 /* TCP */
 #define DEFAULT_RAW_IP_PROTOCOL		6 /* TCP */
--- a/parseoptions.c
+++ b/parseoptions.c
@@ -463,6 +463,10 @@
 			break;
 		case OPT_ICMP_IPID:
 			icmp_ip_id = strtol(ago_optarg, NULL, 0);
+			if (icmp_ip_id < 0 || icmp_ip_id > 0xffff) {
+				fprintf(stderr, "Bad ICMP IP ID, resetting to random.\n");
+				icmp_ip_id = DEFAULT_ICMP_IP_ID;
+			}
 			break;
 		case OPT_ICMP_IPPROTO:
 			icmp_ip_protocol = strtol(ago_optarg, NULL, 0);
--- a/sendicmp.c
+++ b/sendicmp.c
@@ -83,7 +83,7 @@
 	icmp->type = opt_icmptype;	/* echo replay or echo request */
 	icmp->code = opt_icmpcode;	/* should be indifferent */
 	icmp->checksum = 0;
-	icmp->un.echo.id = getpid() & 0xffff;
+	icmp->un.echo.id = icmp_ip_id == DEFAULT_ICMP_IP_ID ? getpid() & 0xffff : icmp_ip_id;
 	icmp->un.echo.sequence = _icmp_seq;
 
 	/* data */