#!/usr/bin/awk -f

{
	seq = $0;

	# Skip this line if the below substitution fails (can't find icmp_seq)
	if (!sub(".*icmp_seq=", "", seq)) {
		next;
	}
	sub(" .*", "", seq);

	if (lastseq != "" && lastseq + 1 != seq) {
		missing = seq - lastseq - 1;
		printf "-- Missing %d packet%s between sequence %d and %d\n",
			missing, (missing > 1 ? "s" : ""), lastseq, seq;
		print lastline;
		print $0;
		print ""
	}

	lastseq = seq;
	lastline = $0;
}