--- a/arpwatch.c	2017-03-22 08:44:22.095722636 +0100
+++ b/arpwatch.c	2017-03-22 09:11:08.119515745 +0100
@@ -123,6 +123,7 @@ struct nets {
 static struct nets *nets;
 static int nets_ind;
 static int nets_size;
+static int ignore_zero_net;
 
 extern int optind;
 extern int opterr;
@@ -477,6 +478,11 @@ process_ether(register u_char *u, regist
 	/* Source ip address */
 	BCOPY(SPA(ea), &sia, 4);
 
+	if (sia == 0 && ignore_zero_net) {
+		syslog(LOG_DEBUG, "ignoring packet from 0.0.0.0");
+		return;
+	}
+
 	/* Watch for bogons */
 	if (isbogon(sia)) {
 		dosyslog(LOG_INFO, "bogon", sia, sea, sha);
@@ -802,6 +808,9 @@ addnet(register const char *str)
 	np->netmask = m;
 	++nets_ind;
 
+	if (n == 0)
+		ignore_zero_net = 1;
+
 	return (1);
 }