Index: arpwatch/arpwatch.c
diff -u arpwatch/arpwatch.c:1.1.1.1 arpwatch/arpwatch.c:1.1.1.1.20.1
--- arpwatch/arpwatch.c:1.1.1.1	Tue Apr 17 13:31:36 2001
+++ arpwatch/arpwatch.c	Thu Aug 12 23:51:51 2004
@@ -223,9 +223,10 @@
 
 		/* Determine network and netmask */
 		if (pcap_lookupnet(interface, &net, &netmask, errbuf) < 0) {
-			(void)fprintf(stderr, "%s: bad interface %s: %s\n",
-			    prog, interface, errbuf);
-			exit(1);
+			syslog(LOG_NOTICE, "bad interface %s: %s - assuming unconfigured interface",
+				interface, errbuf);
+			net = 0;
+			netmask = 0;
 		}
 
 		/* Drop into the background if not debugging */